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Patient Management

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Question 161Question →

A 68-year-old man presents to the clinic with a 4-week history of generalized pruritus, darkening of his urine, and pale-colored stools. Over the past three months, he has unintentionally lost 6 kg (13 lb). He reports no abdominal pain, nausea, or vomiting. His past medical history is significant for hypertension and type 2 diabetes mellitus, which was newly diagnosed 6 months ago. He has a 40-pack-year smoking history. Vital signs are within normal limits. Physical examination reveals scleral icterus, excoriations on his extremities, and a palpable, non-tender mass in the right upper quadrant.

Laboratory studies show:
Total bilirubin: 11.2 mg/dL
Direct bilirubin: 8.8 mg/dL
Alkaline phosphatase: 580 U/L
Aspartate aminotransferase (AST): 85 U/L
Alanine aminotransferase (ALT): 92 U/L
Lipase: 45 U/L

An ultrasound of the right upper quadrant demonstrates marked intrahepatic and extrahepatic biliary dilation. The common bile duct measures 14 mm in diameter. The gallbladder is distended and thin-walled, with no echogenic shadowing to suggest cholelithiasis. The distal common bile duct and the pancreas are obscured by overlying bowel gas.

Which of the following is the most appropriate next step in the diagnostic workup?

Show answer & explanation

Answer: Multiphasic computed tomography of the abdomen

Answer

Multiphasic computed tomography of the abdomen
The correct answer is multiphasic computed tomography of the abdomen. This patient's painless jaundice, weight loss, recent-onset diabetes, and palpable non-tender gallbladder (Courvoisier sign) are highly suspicious for a malignant biliary obstruction, particularly pancreatic head adenocarcinoma. The initial evaluation of jaundice typically begins with a right upper quadrant ultrasound to differentiate between intrahepatic and extrahepatic cholestasis and to check for gallstones. In this scenario, the ultrasound confirmed extrahepatic dilation but was unable to visualize the distal bile duct and pancreas due to bowel gas—a very common limitation of ultrasound. The optimal next step is a multiphasic ('pancreatic protocol') CT scan of the abdomen. This specific imaging modality accurately visualizes the primary mass, evaluates for critical vascular invasion (e.g., superior mesenteric vessels, celiac axis), and detects hepatic or regional lymph node metastases. This sequence ensures complete non-invasive staging to determine surgical resectability before subjecting the patient to invasive procedures.

Step-by-Step Solution

1
Analyze the clinical presentation and physical examination.
The patient exhibits painless jaundice, significant weight loss, atypical new-onset diabetes, and a palpable non-tender gallbladder (Courvoisier sign). This constellation of findings is highly suspicious for a malignant extrahepatic biliary obstruction, most commonly pancreatic head adenocarcinoma.
To formulate a prioritized differential diagnosis based on the chief complaint and history.
2
Interpret the initial laboratory and imaging data.
Laboratory results demonstrate a pronounced cholestatic pattern (elevated direct bilirubin and alkaline phosphatase). The initial right upper quadrant ultrasound confirms profound extrahepatic biliary dilation without gallstones, but it fails to visualize the distal bile duct and pancreas due to overlying bowel gas.
To determine the anatomical level of obstruction and evaluate the diagnostic adequacy of the initial screening test.
3
Determine the optimal next step in the diagnostic sequence.
A multiphasic computed tomography (CT) scan of the abdomen is required.
Prior to pursuing any invasive diagnostic or palliative procedures, non-invasive cross-sectional imaging is mandatory to define the primary mass, evaluate for critical vascular invasion, and detect distant metastases, which ultimately dictates surgical resectability.

Key Concept

In the diagnostic evaluation of suspected malignant biliary obstruction (e.g., pancreatic cancer), following an initial ultrasound that shows biliary dilation, the next most appropriate step is a multiphasic CT of the abdomen to stage the disease non-invasively before pursuing invasive tissue sampling or endoscopic palliation.
Question 162Question →

A 7474-year-old woman is brought to the emergency department from a long-term care facility due to worsening lethargy and confusion over the past 2424 hours. Staff members report that her urine has been noticeably dark and foul-smelling. Her past medical history includes type 2 diabetes mellitus, essential hypertension, and advanced Alzheimer dementia. Upon physical examination, she is minimally responsive to painful stimuli but her airway remains patent. Her skin is warm, flushed, and dry. Vital signs show a temperature of 39.4∘C39.4^{\circ}\text{C} (102.9∘F102.9^{\circ}\text{F}), blood pressure of 76/40 mm Hg76/40\text{ mm Hg}, heart rate of 122/min122/\text{min}, and respiratory rate of 24/min24/\text{min}. Oxygen saturation is 96%96\% on room air. Her capillary refill time is 4 seconds4\text{ seconds}. Which of the following are the most appropriate simultaneous initial steps in the management of this patient? (Select 2 answers)

Select all that apply

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Answer: Rapid administration of intravenous crystalloids; Administration of empiric intravenous broad-spectrum antibiotics

Answer

The most appropriate simultaneous initial steps are the rapid administration of intravenous crystalloids and the administration of empiric intravenous broad-spectrum antibiotics.
The correct answers are the rapid administration of intravenous crystalloids and the administration of empiric intravenous broad-spectrum antibiotics. This patient presents with classical signs of distributive (septic) shock, likely secondary to a severe urinary tract infection. The cornerstone of initial stabilization in undifferentiated and septic shock relies on the immediate, simultaneous initiation of aggressive fluid resuscitation (typically 30 mL/kg30\text{ mL/kg} of crystalloids) to restore intravascular volume, and broad-spectrum antibiotics to control the underlying infection. These interventions take absolute priority over definitive imaging, invasive testing, or ward transfer.

Step-by-Step Solution

1
Identify the patient's acute clinical condition.
The combination of altered mental status, high fever, profound hypotension, tachycardia, and a suspected urinary source indicates uncompensated septic shock.
Recognizing the shock state prioritizes immediate life-saving interventions over definitive diagnostics or disposition planning.
2
Determine the highest-priority initial management bundle.
Simultaneous execution of intravenous fluid challenge and early broad-spectrum antimicrobial administration.
In septic shock, mortality increases significantly with every hour of delayed fluid resuscitation and antibiotic therapy.

Key Concept

Initial stabilization of septic shock requires the immediate and simultaneous administration of intravenous crystalloid fluids and broad-spectrum antibiotics prior to advanced imaging or disposition.
Question 163Question →

A 78-year-old man with advanced Parkinson disease and severe oropharyngeal dysphagia is evaluated during a home hospice visit. Over the past 24 hours, his level of consciousness has declined, and he is now unresponsive to verbal and tactile stimuli. His respiratory pattern is irregular, and each breath is accompanied by a loud, gurgling noise during both inspiration and expiration. The patient has a medical history significant for angle-closure glaucoma and benign prostatic hyperplasia complicated by recurrent urinary retention. His wife, who is his designated health care proxy, is severely distressed by his breathing sounds and tearfully asks, "He sounds like he is drowning; please do something to clear his chest!" Current medications include a continuous subcutaneous infusion of morphine, and carbidopa-levodopa administered via a gastrostomy tube. Vital signs reveal a pulse of 110/min, respirations of 26/min, and blood pressure of 90/50 mm Hg. Which of the following is the most appropriate next step in management?

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Answer: Reposition the patient into a lateral decubitus position and provide education to the wife regarding the physiology of the dying process.

Answer

The most appropriate next step is to reposition the patient into a lateral decubitus position and provide thorough education to the wife about the normal physiology of the dying process.
The patient is actively dying and presenting with terminal secretions ('death rattle'). This occurs due to the pooling of salivary and oropharyngeal secretions when the swallowing reflex is lost. While often highly distressing to family members who fear the patient is suffocating, it is generally not uncomfortable for the comatose patient. The definitive first step in management is non-pharmacologic: repositioning the patient into a lateral or semi-prone position to facilitate postural drainage, combined with intensive education and reassurance for the family. In this complex patient, pharmacologic interventions carry severe risks and must be avoided.

Step-by-Step Solution

1
Identify the clinical syndrome and its impact.
The patient has 'death rattle' (terminal secretions) due to loss of the swallowing reflex in the actively dying phase. The primary distress is experienced by the wife, not the comatose patient.
Accurate identification prevents the escalation of invasive medical treatments for a normal terminal symptom.
2
Prioritize initial interventions.
Select non-pharmacologic measures as the first-line therapy.
Postural drainage via repositioning (lateral or semi-prone) uses gravity to clear the airway safely, while education addresses the surrogate's anxiety.
3
Evaluate the patient for pharmacologic contraindications.
Recognize that standard medications like scopolamine (anticholinergic) or metoclopramide (dopamine antagonist) carry severe risks for this specific patient.
The patient has angle-closure glaucoma (contraindicating scopolamine) and Parkinson disease (contraindicating metoclopramide), making pharmacologic intervention highly hazardous.

Key Concept

First-line management of terminal secretions ('death rattle') focuses on non-pharmacologic interventions such as patient repositioning and family education, carefully avoiding contraindicated medications like anticholinergics in patients with angle-closure glaucoma.
Question 164Question →

A 68-year-old woman with advanced amyotrophic lateral sclerosis is evaluated in the emergency department for severe dyspnea and fever. She is entirely dependent on others for activities of daily living and uses noninvasive positive pressure ventilation 24 hours a day for chronic respiratory failure. She communicates effectively via an eye-tracking speech-generating device. Today, she is diagnosed with severe aspiration pneumonia and acute respiratory distress syndrome. The critical care physician informs her that her respiratory status is rapidly declining and that without endotracheal intubation and invasive mechanical ventilation, she will likely die within hours.

Through her device, the patient clearly states, "I do not want a breathing tube. I want to die peacefully. Please give me medicine to make me sleep."

Her husband, who holds her legally executed durable power of attorney for healthcare, is extremely distressed. He states, "She is legally incompetent right now because her brain isn't getting enough oxygen. I am her proxy, and I authorize you to intubate her immediately."

Arterial blood gas analysis on her current noninvasive ventilation settings reveals a pH of 7.227.22, PaCO2PaCO_2 of 7878 mm Hg, and PaO2PaO_2 of 5858 mm Hg. Despite the severe hypercapnia, the physician's evaluation reveals the patient is fully alert, correctly answers questions about her medical condition, logically explains her rationale for refusing the breathing tube, and accurately describes the fatal consequences of her decision.

Which of the following is the most appropriate next step in management?

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Answer: Respect the patient's refusal, administer intravenous opioids and benzodiazepines, and admit to a comfort-focused care protocol

Answer

The most appropriate next step is to respect the patient's refusal of intubation, administer intravenous opioids and benzodiazepines to manage her dyspnea, and admit her for a comfort-focused care protocol.
The patient clearly demonstrates clinical decision-making capacity because she can understand her medical condition, communicate a clear choice, logically explain her reasoning, and appreciate the consequences of her decision (imminent death). Clinical capacity is determined by the treating physician and is a functional assessment; it is not automatically negated by abnormal laboratory values such as severe hypercapnia. When a patient possesses decision-making capacity, their autonomous choices override the wishes of any designated surrogate, including a durable power of attorney. The surrogate's authority is only activated when the patient loses capacity. Therefore, the physician must respect her refusal of intubation and provide appropriate palliative care, including intravenous opioids (for dyspnea/pain) and benzodiazepines (for anxiety/airway clearance distress), to ensure a peaceful death.

Step-by-Step Solution

1
Evaluate the patient's clinical decision-making capacity.
The patient demonstrates full clinical capacity despite severe hypercapnia, as evidenced by her clear understanding, logical reasoning, and appreciation of the consequences.
A capacitated patient has the fundamental ethical and legal right to refuse any medical intervention, regardless of the consequences.
2
Determine the legal authority of the durable power of attorney (husband).
The husband's authority as a surrogate is superseded by the patient's autonomous decision.
Surrogate decision-makers only possess authority when the primary patient loses clinical decision-making capacity.
3
Formulate a safe and ethical palliative management plan.
Initiate comfort-focused care with intravenous opioids and benzodiazepines in the current hospital setting.
Withholding life-sustaining treatment must be accompanied by aggressive symptom management to prevent suffering during the dying process.

Key Concept

A patient with clinical decision-making capacity retains the right to refuse life-sustaining treatment, which overrides the demands of any designated surrogate decision-maker. Capacity is a clinical determination based on functional understanding and reasoning, not strictly on physiological parameters like hypercapnia.
Question 165Question →

A 32-year-old woman is evaluated in the neurology clinic for a three-month history of intermittent double vision and bilateral drooping of her eyelids. She notes that her symptoms are typically absent upon awakening but progressively worsen throughout the day, particularly after prolonged reading. Recently, she has also experienced transient difficulty chewing tough foods during the evening. Her past medical history is unremarkable, and she takes no medications. Vital signs are within normal limits. Neurologic examination reveals bilateral ptosis that worsens after sustained upward gaze for two minutes. Extraocular movements are restricted in multiple directions without a clear single cranial nerve pattern. Pupillary responses are brisk and symmetric. Muscle strength in the extremities is 5/5, and deep tendon reflexes are 2+ throughout. Which of the following is the most appropriate next step in the diagnostic workup?

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Answer: Acetylcholine receptor antibody assay

Answer

The most appropriate initial diagnostic step is serologic testing with an acetylcholine receptor antibody assay.
The correct answer is the acetylcholine receptor antibody assay. This patient's presentation of fluctuating, fatigable weakness (worsening ptosis, diplopia, and mastication fatigue later in the day) is the classic hallmark of myasthenia gravis. The diagnosis is confirmed by identifying autoantibodies directed against components of the neuromuscular junction. The initial, most cost-effective, and highly specific test is the acetylcholine receptor (AChR) antibody assay, which is positive in approximately 85% of patients with generalized myasthenia gravis. Proper test sequencing dictates that non-invasive, highly specific biochemical markers should be evaluated prior to advanced imaging or electrodiagnostic testing.

Step-by-Step Solution

1
Analyze the clinical presentation and physical examination findings.
The patient is a young woman presenting with fatigable weakness involving the extraocular, bulbar, and facial muscles (ptosis, diplopia, chewing difficulty), with normal pupillary responses and intact deep tendon reflexes.
Identifying the specific pattern of motor weakness and absence of sensory or reflex changes characterizes the anatomic location of the lesion.
2
Localize the lesion to formulate a preliminary diagnosis.
Fluctuating, fatigable weakness without sensory or autonomic deficits points precisely to a neuromuscular junction disorder, specifically myasthenia gravis (MG).
Central or peripheral nerve lesions typically present with constant deficits, reflex changes, or sensory loss, distinguishing them from neuromuscular junction pathologies.
3
Determine the optimal sequence of diagnostic tests for suspected myasthenia gravis.
The initial standard-of-care step is to detect disease-specific autoantibodies (AChR). Imaging of the thymus and invasive electrophysiologic studies are deferred until after serologic screening.
Serologic testing is highly specific, non-invasive, and confirms the diagnosis in the vast majority of patients, which safely dictates the subsequent test sequencing.

Key Concept

The initial diagnostic step for suspected myasthenia gravis is serologic testing for acetylcholine receptor (AChR) antibodies; chest imaging to screen for thymoma and electrodiagnostic testing are indicated only later in the diagnostic algorithm.
Question 166Question →

A 7676-year-old woman is brought to the emergency department by her son due to increasing generalized weakness, confusion, and several episodes of nonbilious vomiting over the past 4848 hours. She has a history of ischemic cardiomyopathy with a left ventricular ejection fraction of 30%30\%, persistent atrial fibrillation, and chronic kidney disease. Her daily medications include lisinopril, bisoprolol, furosemide, apixaban, and digoxin. Four days ago, she was evaluated at an urgent care clinic for palpitations and was prescribed oral verapamil.

On physical examination, the patient is lethargic but arousable. Blood pressure is 82/48 mm Hg82/48\text{ mm Hg} and pulse is 36/min36\text{/min}. Cardiopulmonary examination reveals bradycardia with a regular rhythm and clear lungs. An electrocardiogram demonstrates a junctional escape rhythm at 36/min36\text{/min} with frequent premature ventricular contractions.

Laboratory studies show:
Serum sodium: 136 mEq/L136\text{ mEq/L}
Serum potassium: 6.5 mEq/L6.5\text{ mEq/L}
Serum chloride: 101 mEq/L101\text{ mEq/L}
Serum bicarbonate: 22 mEq/L22\text{ mEq/L}
Blood urea nitrogen: 48 mg/dL48\text{ mg/dL}
Serum creatinine: 2.3 mg/dL2.3\text{ mg/dL} (baseline 1.5 mg/dL1.5\text{ mg/dL})
Serum digoxin level: pending

In addition to discontinuing the offending medications, which of the following is the most appropriate next step in the pharmacologic management of this patient?

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Answer: Administer digoxin-specific antibody fragments

Answer

The most appropriate next step is to administer digoxin-specific antibody fragments.
The patient presents with classic signs of acute-on-chronic digoxin toxicity, precipitated by a recent drug-drug interaction. Verapamil is a potent inhibitor of P-glycoprotein, the primary efflux transporter responsible for the renal and biliary clearance of digoxin. Co-administration of verapamil can rapidly double serum digoxin concentrations, leading to toxicity characterized by gastrointestinal distress, neurologic symptoms, and varied arrhythmias (e.g., severe bradycardia, junctional escape rhythms, premature ventricular contractions).

A critical marker of severe digoxin toxicity is hyperkalemia. Digoxin reversibly inhibits the Na+/K+-ATPase pump, preventing the intracellular influx of potassium. In the setting of digoxin toxicity with life-threatening hyperkalemia (K+>5.5 mEq/LK^+ > 5.5\text{ mEq/L}) and hemodynamic instability, the definitive and immediate pharmacologic intervention is the administration of digoxin-specific antibody fragments (DigiFab).

While standard Advanced Cardiac Life Support (ACLS) guidelines for hyperkalemia recommend membrane stabilization with intravenous calcium gluconate, calcium administration is historically contraindicated in the setting of digoxin toxicity. The inhibited Na+/K+-ATPase already causes a buildup of intracellular sodium, which reverses the Na+/Ca2+ exchanger, leading to dangerously high intracellular calcium. Administering exogenous calcium can theoretically precipitate irreversible myocardial contracture (known as 'stone heart'). Therefore, digoxin-specific antibody fragments must be administered promptly to bind free digoxin, reversing the pump inhibition and correcting both the arrhythmias and the hyperkalemia.

Step-by-Step Solution

1
Analyze the patient's symptoms and vital signs in the context of recent medication changes.
The combination of lethargy, vomiting, profound bradycardia (36/min36\text{/min}), and hypotension indicates severe cardiovascular compromise following the addition of verapamil to a regimen containing digoxin.
Verapamil is a potent P-glycoprotein inhibitor that significantly decreases the renal clearance of digoxin, predictably leading to acute-on-chronic digoxin toxicity.
2
Interpret the laboratory findings to determine the severity and primary threat of the toxidrome.
The serum potassium is markedly elevated at 6.5 mEq/L6.5\text{ mEq/L}.
In digoxin toxicity, the Na+/K+-ATPase pump is inhibited, leading to extracellular potassium accumulation. Severe hyperkalemia is a critical marker of widespread pump poisoning and correlates closely with mortality.
3
Select the guideline-concordant pharmacologic intervention, noting any critical contraindications.
Digoxin-specific antibody fragments must be administered immediately.
While standard ACLS hyperkalemia management involves membrane stabilization with intravenous calcium, calcium is contraindicated in digoxin toxicity due to the risk of irreversible myocardial contracture. The definitive treatment for digoxin-induced life-threatening hyperkalemia is antibody fragments.

Key Concept

Management of life-threatening hyperkalemia in the setting of digoxin toxicity requires the administration of digoxin-specific antibody fragments, and standard calcium gluconate therapy is traditionally contraindicated.
Estimated Time:1m 30s
Question 167Question →

A 54-year-old man is evaluated in the intensive care unit for sudden-onset severe respiratory distress and hypotension. The patient was admitted three days ago for severe acute respiratory distress syndrome (ARDS) secondary to viral pneumonia and is currently intubated and mechanically ventilated. Current ventilator settings include a positive end-expiratory pressure (PEEP) of 15 cm H2O. Two minutes ago, the high-pressure ventilator alarm began sounding continuously. Vital signs are temperature 37.4°C (99.3°F), blood pressure 72/40 mmHg, pulse 138/min, and respirations 28/min. Pulse oximetry shows an oxygen saturation of 81%. On physical examination, the patient is diaphoretic and cyanotic. The trachea is palpably deviated to the left. Auscultation reveals completely absent breath sounds over the right hemithorax with hyperresonance to percussion. Which of the following is the most appropriate next step in the management of this patient?

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Answer: Performance of a right-sided needle thoracostomy

Answer

Performance of a right-sided needle thoracostomy
The correct intervention is immediate right-sided pleural decompression (needle or finger thoracostomy). This patient has classic signs of a tension pneumothorax: sudden hypotension, hypoxemia, high ventilator airway pressures, absent right-sided breath sounds, hyperresonance, and contralateral tracheal deviation. Patients receiving mechanical ventilation with high positive end-expiratory pressure (PEEP) for ARDS are at exceptionally high risk for barotrauma. The accumulated air under pressure collapses the right lung and shifts the mediastinum to the left, compressing the vena cava. This obstructs venous return, causing life-threatening obstructive shock. Treatment must be initiated instantly based on clinical findings.

Step-by-Step Solution

1
Identify the primary clinical syndrome based on physical exam and vital signs.
The patient has a tension pneumothorax, indicated by severe hypotension, tracheal deviation to the contralateral side, absent breath sounds, and hyperresonance on the ipsilateral side.
High PEEP in ARDS significantly increases the risk of alveolar rupture and subsequent barotrauma.
2
Determine the pathophysiological mechanism of the patient's instability.
The patient is experiencing obstructive shock.
High intrathoracic pressure from the tension pneumothorax compresses the superior and inferior vena cava, severely reducing venous return to the heart and causing cardiovascular collapse.
3
Select the most appropriate immediate procedural intervention.
Immediate pleural decompression via needle or finger thoracostomy.
Definitive management requires immediate evacuation of pleural air to restore venous return and cardiac output, followed by formal chest tube placement.

Key Concept

Tension pneumothorax is a clinical diagnosis requiring immediate bedside procedural decompression (needle or finger thoracostomy) before any imaging or transition of care.
Question 168Question →

A 55-year-old woman comes to the office to discuss the results of a recent imaging study. She visited an urgent care clinic two weeks ago for acute right flank pain. An unenhanced CT scan of the abdomen and pelvis showed a 3.0-mm nonobstructing right renal calculus and an incidental 3.2-cm homogenous, lipid-rich mass in the left adrenal gland. Her flank pain has since resolved. Her medical history is significant for hypertension diagnosed six months ago, which is currently managed with amlodipine. Her blood pressure today is 148/92 mmHg, pulse is 78/min, and BMI is 29 kg/m². Physical examination is unremarkable, with no abdominal striae, proximal muscle weakness, or hirsutism. Serum potassium is 3.8 mEq/L. Which of the following is the most appropriate next step in the diagnostic evaluation of this patient?

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Answer: Overnight 1-mg dexamethasone suppression test, plasma free metanephrines, and plasma aldosterone-to-renin ratio

Answer

The correct approach is to perform a comprehensive biochemical evaluation using an overnight 1-mg dexamethasone suppression test, plasma free metanephrines, and a plasma aldosterone-to-renin ratio.
The initial management of an incidentally discovered adrenal mass (incidentaloma) focuses on evaluating its functional status and assessing its malignant potential. Because this mass is small (<4 cm) and possesses benign radiologic features (homogenous, lipid-rich on unenhanced CT), immediate surgical removal or further radiologic characterization with MRI is not indicated. However, a biochemical evaluation is mandatory. All patients with an adrenal incidentaloma require screening for autonomous cortisol secretion (e.g., 1-mg overnight dexamethasone suppression test) and pheochromocytoma (e.g., plasma free metanephrines or 24-hour urine fractionated metanephrines). Furthermore, because this patient has a history of hypertension, screening for primary aldosteronism using a plasma aldosterone-to-renin ratio is also required.

Step-by-Step Solution

1
Analyze the clinical presentation.
The patient has an incidentally discovered 3.2-cm adrenal mass (incidentaloma) with benign imaging characteristics (lipid-rich, homogenous) and a history of hypertension.
Identifying the incidental nature, size, imaging characteristics, and comorbid hypertension dictates the required diagnostic pathways.
2
Evaluate the need for immediate surgical or further radiologic investigation.
The mass is less than 4 cm and has benign radiologic features on the unenhanced CT.
Masses >4 cm or those with heterogeneous, lipid-poor features on imaging have a higher suspicion for malignancy and may require distinct management.
3
Determine the necessary biochemical screening tests.
Screening for subclinical Cushing syndrome and pheochromocytoma is required for all patients. Screening for primary aldosteronism is added due to the presence of hypertension.
All adrenal incidentalomas must be evaluated for functional status (hormone hypersecretion) regardless of the presence of typical clinical symptoms.

Key Concept

Diagnostic Workup of Adrenal Incidentaloma
Question 169Question →

An ambulance arrives at the emergency department with a 28-year-old woman who collapsed during dinner at a seafood restaurant. Bystanders report she developed severe lip swelling, intense pruritus, and a hoarse voice minutes after eating a crab cake, followed shortly by unresponsiveness. Upon arrival, her blood pressure is 76/40 mm Hg, heart rate is 138/min, and respiratory rate is 28/min. Oxygen saturation is 89% on room air. Physical examination reveals a lethargic patient with pronounced angioedema of the lips and tongue, audible inspiratory stridor, and a diffuse urticarial rash. Which of the following simultaneous interventions represent the most appropriate immediate initial stabilization steps? (Select 2 options)

Select all that apply

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Answer: Intramuscular injection of epinephrine; Rapid infusion of intravenous crystalloids

Answer

The most appropriate immediate stabilization steps are the intramuscular injection of epinephrine and the rapid infusion of intravenous crystalloids.
The patient is presenting with severe anaphylaxis characterized by distributive shock (profound hypotension, compensatory tachycardia) and impending airway obstruction (angioedema, inspiratory stridor). The absolute cornerstone of initial stabilization in anaphylaxis is the immediate administration of intramuscular epinephrine to induce vasoconstriction, reduce mucosal edema, and promote bronchodilation. Simultaneously, because anaphylaxis causes a massive shift of intravascular fluid into the extravascular space, rapid infusion of intravenous crystalloids is required to restore preload and maintain perfusion.

Step-by-Step Solution

1
Assess the patient's hemodynamic and respiratory status based on the clinical vignette.
The patient is in severe distributive (anaphylactic) shock with impending airway compromise, indicated by hypotension, tachycardia, hypoxia, and inspiratory stridor.
Recognizing the severity and mechanism of shock dictates the urgency and specific type of interventions required.
2
Select the most critical simultaneous initial interventions for this specific pathology.
Simultaneous administration of IM epinephrine and IV fluid boluses.
Epinephrine immediately reverses vasodilation and upper airway edema, while rapid IV crystalloids restore the severely depleted intravascular volume.

Key Concept

Immediate resuscitation in anaphylactic shock requires the simultaneous administration of intramuscular epinephrine and aggressive intravenous fluid resuscitation.
Question 170Question →

A 49-year-old man with a history of recurrent severe dyspepsia and chronic watery diarrhea is admitted to the hospital due to an episode of melena. He has been taking high-dose omeprazole for the past year with minimal relief of his abdominal symptoms. Esophagogastroduodenoscopy performed upon admission reveals prominently thickened gastric folds, severe erosive esophagitis, and multiple ulcerations extending into the descending duodenum and proximal jejunum. Rapid urease testing for Helicobacter pylori is negative. The physician suspects a neuroendocrine tumor as the underlying cause of the patient's presentation.

Arrange the following diagnostic steps in the most appropriate sequential order to establish the diagnosis and formulate a definitive management plan, from the initial biochemical screening test to the final invasive localization procedure.

Drag items to arrange them in the correct order

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Answer

The proper sequencing of diagnostic steps for suspected Zollinger-Ellison syndrome requires initial biochemical screening with fasting serum gastrin and gastric pH, followed by a confirmatory secretin stimulation test. After biochemical diagnosis, non-invasive localization using somatostatin receptor imaging (Ga-68 DOTATATE PET/CT) is performed. Finally, invasive localization with endoscopic ultrasound is utilized for precise pre-operative surgical mapping.
The algorithm for diagnosing and managing a suspected gastrinoma strictly separates biochemical confirmation from anatomical localization. Step 1: Biochemical screening always begins with fasting serum gastrin and gastric pH to confirm acid-hypersecretory hypergastrinemia. Step 2: Because many patients have non-diagnostic gastrin elevations (110-1000 pg/mL), a secretin stimulation test is the requisite confirmatory step. Step 3: Once biochemically confirmed, non-invasive anatomical localization is performed, currently best achieved with somatostatin receptor imaging such as Ga-68 DOTATATE PET/CT. Step 4: If functional imaging is negative, or for high-resolution presurgical planning of tumors in the duodenal wall or pancreatic head, endoscopic ultrasound (EUS) is the final invasive localization step.

Step-by-Step Solution

1
Initial Biochemical Screening
Measurement of fasting serum gastrin level and gastric pH.
To identify hypergastrinemia in the setting of an acidic stomach, definitively differentiating it from appropriate secondary hypergastrinemia due to achlorhydria.
2
Confirmatory Testing
Intravenous secretin stimulation test.
To distinguish a gastrinoma (which will paradoxically increase gastrin secretion in response to secretin) from other causes of hypergastrinemia, particularly when initial gastrin levels are equivocal.
3
Non-Invasive Localization
Gallium-68 DOTATATE PET/CT.
To localize the primary neuroendocrine tumor and evaluate for distant metastatic disease using highly sensitive functional somatostatin receptor imaging.
4
Invasive Localization and Surgical Planning
Endoscopic ultrasound (EUS) of the peripancreatic region and duodenum.
To pinpoint small submucosal tumors located within the gastrinoma triangle that might be missed by non-invasive imaging, and to assess relationship to local vasculature prior to surgical exploration.

Key Concept

Diagnostic sequencing for Zollinger-Ellison Syndrome (Gastrinoma)
Question 171Question →

An ambulance brings a 72-year-old man to the emergency department following two episodes of massive, painless bright red rectal bleeding at home. He reports associated lightheadedness and diaphoresis. His medical history includes hypertension, hyperlipidemia, and severe bilateral knee osteoarthritis. His medications include lisinopril, atorvastatin, and high-dose ibuprofen. On presentation, he appears pale and lethargic but is arousable. Vital signs show a temperature of 36.8°C (98.2°F), heart rate of 128/min, blood pressure of 82/52 mm Hg, and respiratory rate of 20/min. Physical examination reveals a soft, non-tender abdomen without organomegaly. Digital rectal examination demonstrates gross bright red blood and clots, with no palpable rectal masses. Two large-bore intravenous catheters are placed, and aggressive resuscitation with isotonic crystalloids and packed red blood cells is initiated. Which of the following is the most appropriate next step in the diagnostic workup?

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Answer: Esophagogastroduodenoscopy

Answer

Esophagogastroduodenoscopy is the most appropriate next step to rapidly rule out and potentially treat a massive upper gastrointestinal bleed.
This patient is presenting with massive hematochezia (bright red blood per rectum) and hemodynamic instability (hypotension, tachycardia, altered mental status). While hematochezia typically suggests a lower gastrointestinal source (e.g., diverticulosis), approximately 10% to 15% of patients with severe hematochezia and shock actually have a rapidly bleeding upper GI source, such as a peptic ulcer. The massive volume of blood transits through the GI tract so rapidly that it does not undergo the chemical digestion required to form melena. Given this patient's history of daily high-dose ibuprofen use, his risk for a bleeding peptic ulcer is exceptionally high. According to established management algorithms, the first diagnostic step after initiating resuscitation for severe, unstable hematochezia is an esophagogastroduodenoscopy (EGD). EGD is rapid, does not require bowel preparation, and offers both diagnostic and therapeutic capabilities for a life-threatening upper GI bleed.

Step-by-Step Solution

1
Assess the patient's hemodynamic status and presenting symptoms.
The patient has massive hematochezia and is in hypovolemic shock (tachycardia, hypotension, lethargy).
Hemodynamic instability dictates an aggressive, emergent diagnostic algorithm rather than routine outpatient or ward-level evaluation.
2
Analyze the patient's risk factors based on medical history.
The patient uses daily high-dose ibuprofen for osteoarthritis, placing him at significant risk for peptic ulcer disease.
Identifying etiologic risk factors helps prioritize the most likely and dangerous sources of bleeding.
3
Apply the diagnostic algorithm for hemodynamically unstable hematochezia.
Recognize that massive upper GI bleeding can present as hematochezia due to rapid transit time. Therefore, an upper GI evaluation must precede lower GI investigations.
An upper GI bleed is immediately life-threatening but can often be diagnosed and treated quickly with endoscopy without the need for bowel preparation.

Key Concept

In patients presenting with severe hematochezia and hemodynamic instability, an upper gastrointestinal source must be suspected. Esophagogastroduodenoscopy (EGD) should be the first diagnostic procedure performed immediately following initial fluid and blood resuscitation.
Estimated Time:1m 30s
Question 172Question →

A 7474-year-old male is in the intensive care unit recovering from an acute exacerbation of chronic obstructive pulmonary disease requiring mechanical ventilation. On hospital day 77, he remains ventilator-dependent and requires a continuous norepinephrine infusion to maintain a mean arterial pressure of 6565 mmHg. His temperature rises to 39.2∘39.2^\circ C (102.6∘102.6^\circ F) and his leukocyte count increases from 11,00011,000/mm 3^3 to 24,00024,000/mm 3^3. Physical examination reveals a firm, distended abdomen. When sedation is briefly paused, the patient grimaces significantly during palpation of the right upper quadrant. Laboratory studies are notable for a total bilirubin of 2.12.1 mg/dL, alkaline phosphatase of 180180 U/L, and aspartate aminotransferase of 6565 U/L. A bedside abdominal ultrasound demonstrates a markedly distended gallbladder with a 66-mm thickened wall, pericholecystic fluid, and no evidence of gallstones or biliary ductal dilation. Which of the following are the most appropriate next steps in the management of this patient? (Select exactly two)

Select all that apply

Show answer & explanation

Answer: Percutaneous cholecystostomy tube placement; Administration of broad-spectrum intravenous antibiotics

Answer

The most appropriate next steps are percutaneous cholecystostomy tube placement and the administration of broad-spectrum intravenous antibiotics.
The correct answers identify that the patient is suffering from acute acalculous cholecystitis, a life-threatening condition commonly seen in critically ill, mechanically ventilated patients. The diagnosis is confirmed by the clinical picture combined with ultrasound findings of a thickened gallbladder wall (greater than 33 mm), pericholecystic fluid, and absence of gallstones. Because the patient is dependent on vasopressors, surgical removal of the gallbladder (cholecystectomy) is contraindicated due to an unacceptably high perioperative mortality rate. Therefore, the most appropriate management involves immediate medical stabilization with broad-spectrum intravenous antibiotics and minimally invasive source control via percutaneous cholecystostomy tube placement.

Step-by-Step Solution

1
Identify the clinical syndrome based on the patient's presentation in the vignette.
The patient has new-onset fever, severe leukocytosis, right upper quadrant tenderness, and is critically ill on vasopressors.
Recognizing the systemic signs of infection and localizing abdominal signs points toward an acute intra-abdominal source.
2
Interpret the bedside imaging findings to establish a diagnosis.
Ultrasound reveals a thickened gallbladder wall and pericholecystic fluid without gallstones or ductal dilation.
These specific structural findings in a critically ill ICU patient are highly diagnostic for acute acalculous cholecystitis.
3
Determine the appropriate surgical or procedural intervention based on the patient's clinical stability.
Because the patient is hemodynamically unstable and dependent on norepinephrine, definitive surgical intervention carries an unacceptably high mortality risk. Minimally invasive percutaneous drainage must be paired with medical management (IV antibiotics).
Percutaneous cholecystostomy serves as a life-saving bridge or definitive therapy for patients whose comorbidities absolutely contraindicate general anesthesia and laparoscopy.

Key Concept

In critically ill, hemodynamically unstable patients who develop acute acalculous cholecystitis, the standard of care is source control via percutaneous cholecystostomy tube placement combined with broad-spectrum intravenous antibiotics, as surgical cholecystectomy carries an excessively high mortality risk.
Question 173Question →

A 68-year-old man presents to the emergency department with worsening shortness of breath on exertion, orthopnea, and lower extremity edema over the past 33 weeks. He has a history of hypertension, type 2 diabetes mellitus, and paroxysmal atrial fibrillation. Two years ago, an echocardiogram demonstrated a normal left ventricular ejection fraction (LVEF) of 55%55\%.

His current home medications include:
- Flecainide 5050 mg twice daily
- Diltiazem CD 240240 mg daily
- Metformin 10001000 mg twice daily
- Apixaban 55 mg twice daily

Vital signs:
- Blood pressure: 118/74118/74 mmHg
- Heart rate: 8888/min (irregularly irregular)
- Respiratory rate: 2222/min
- Oxygen saturation: 92%92\% on room air

Physical examination reveals elevated jugular venous pressure to 1212 cm H2OH_2O, bibasilar lung crackles, and 2+2+ pitting edema of the lower extremities up to the knees. The extremities are warm and well-perfused.
An electrocardiogram confirms atrial fibrillation with a ventricular rate of 8888/min and no acute ischemic changes.
A point-of-care echocardiogram reveals a newly reduced LVEF of 25%25\% with global hypokinesis.

Laboratory studies:
- Serum creatinine: 1.81.8 mg/dL (baseline 1.11.1 mg/dL)
- Blood urea nitrogen: 3838 mg/dL
- Serum potassium: 4.24.2 mEq/L
- NT-proBNP: 4,5004,500 pg/mL (normal: <125<125 pg/mL)

Based on these findings, which of the following pharmacologic interventions are indicated in the immediate management of this patient? (Select all that apply)

Select all that apply

Show answer & explanation

Answer: Discontinue flecainide; Discontinue diltiazem; Initiate intravenous furosemide

Answer

The correct interventions are to discontinue flecainide, discontinue diltiazem, and initiate intravenous furosemide.
The correct interventions address the acute volume overload while removing medications that exacerbate heart failure with reduced ejection fraction (HFrEF). The option to initiate intravenous furosemide is correct because loop diuretics are the first-line therapy for acute decompensated heart failure to relieve pulmonary and systemic congestion. The option to discontinue flecainide is correct because it is a Class IC antiarrhythmic with negative inotropic effects, strictly contraindicated in structural heart disease due to an increased risk of lethal proarrhythmia. The option to discontinue diltiazem is correct as it is a non-dihydropyridine calcium channel blocker possessing potent negative inotropic properties, which exacerbates HFrEF and increases mortality.

Step-by-Step Solution

1
Identify the patient's hemodynamic profile and new diagnosis.
The patient has acute decompensated heart failure ('warm and wet' profile) with a newly reduced LVEF of 25%.
Accurate profiling is essential to guide immediate pharmacologic management and avoid harmful interventions.
2
Review the patient's home medication list for contraindications.
Flecainide and diltiazem are identified as strictly contraindicated.
Both medications possess strong negative inotropic properties that exacerbate HFrEF and increase mortality.
3
Determine the appropriate treatment for the patient's volume overload and acute kidney injury.
Intravenous furosemide is selected as the primary intervention.
The acute kidney injury is due to cardiorenal syndrome (venous congestion). Diuresis relieves congestion and typically improves renal function, whereas fluids would be detrimental.
4
Evaluate the safety of initiating new guideline-directed medical therapies.
Initiation of beta-blockers (e.g., metoprolol succinate) is deferred.
Starting beta-blockers in a significantly volume-overloaded, acutely decompensated patient can precipitate cardiogenic shock and must wait until euvolemia is achieved.

Key Concept

In patients newly diagnosed with heart failure with reduced ejection fraction (HFrEF) presenting with acute decompensation, negatively inotropic medications (e.g., Class IC antiarrhythmics, non-dihydropyridine CCBs) must be immediately discontinued, and diuresis should be initiated to treat cardiorenal syndrome while withholding beta-blocker initiation until euvolemia is achieved.
Question 174Question →

A 72-year-old man is brought to the outpatient neurology clinic by his wife due to new-onset visual hallucinations. For the past three weeks, he has been seeing 'small children playing in the living room' who do not interact with him. The patient retains insight that these visions are not real, but they are becoming increasingly distressing. He has a 6-year history of Parkinson disease, and his motor symptoms have been reasonably well controlled. Vital signs are within normal limits. Physical examination reveals a resting tremor in the right hand, bilateral bradykinesia, and cogwheel rigidity, all of which are stable compared to his previous visit. Montreal Cognitive Assessment score is 26/30. Laboratory studies, including a complete blood count, comprehensive metabolic panel, thyroid-stimulating hormone, and vitamin B12 levels, are within normal limits. Urinalysis is unremarkable. His current medication regimen includes carbidopa-levodopa, ropinirole, selegiline, and benztropine.

Arrange the following pharmacologic interventions in the most appropriate sequential order for managing this patient's psychotic symptoms, from the immediate first step to the final step if symptoms persist.

Drag items to arrange them in the correct order

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Answer

The correct sequence for managing Parkinson disease psychosis is to first discontinue anticholinergics (benztropine), followed by MAO-B inhibitors (selegiline), then dopamine agonists (ropinirole), and finally, if symptoms persist, initiate an atypical antipsychotic (quetiapine).
The correct sequence adheres to the Movement Disorder Society guidelines for managing Parkinson disease psychosis. The fundamental principle is to sequentially discontinue non-essential, high-risk medications before adding new psychiatric drugs. The order of discontinuation strictly follows the rule of stopping drugs with the highest risk of cognitive side effects and lowest motor efficacy first. Anticholinergics (benztropine) are stopped immediately. Next, amantadine and MAO-B inhibitors (selegiline) are withdrawn. If hallucinations persist, dopamine agonists (ropinirole) are tapered and stopped. Only if these measures fail, or if severe motor symptoms preclude reducing the primary carbidopa-levodopa dose, is an atypical antipsychotic with low D2 affinity (such as quetiapine, clozapine, or the 5-HT2A inverse agonist pimavanserin) initiated.

Step-by-Step Solution

1
Rule out secondary causes of psychosis and delirium.
Urinalysis, metabolic panels, and lack of acute cognitive decline (MoCA 26/30) suggest the hallucinations are a primary complication of Parkinson disease medications rather than an acute systemic illness.
Infections, metabolic derangements, and polypharmacy are common triggers for acute mental status changes in the elderly and must be excluded first.
2
Identify the first medication to discontinue based on the risk-to-benefit ratio.
Discontinue oral benztropine.
The standard protocol for Parkinson disease psychosis requires sequential tapering of adjunctive medications. Anticholinergics are stopped first because they cause significant neuropsychiatric side effects and offer minimal benefit for core parkinsonian symptoms.
3
Identify the second medication to discontinue if symptoms persist.
Discontinue oral selegiline.
Amantadine and MAO-B inhibitors are the next to be removed, as they increase dopaminergic tone and carry hallucination risks without matching the efficacy of carbidopa-levodopa.
4
Identify the third medication to discontinue if symptoms persist.
Discontinue oral ropinirole.
Dopamine agonists strongly contribute to psychosis and impulse control disorders. They must be tapered off before considering reductions to the patient's primary carbidopa-levodopa regimen.
5
Determine the final pharmacologic step for refractory symptoms.
Initiate oral quetiapine.
If psychosis persists despite discontinuing all adjunctive medications (and the patient cannot tolerate carbidopa-levodopa reduction due to worsening motor symptoms), adding a targeted atypical antipsychotic like quetiapine, clozapine, or pimavanserin is indicated.

Key Concept

Pharmacologic management of Parkinson disease psychosis follows a strict stepwise reduction of adjunctive medications (Anticholinergics →\rightarrow Amantadine →\rightarrow MAO-B inhibitors →\rightarrow Dopamine agonists →\rightarrow COMT inhibitors) before adding specialized atypical antipsychotics (quetiapine, clozapine, or pimavanserin) to avoid worsening motor symptoms.
Estimated Time:1m 30s
Question 175Question →

A 68-year-old man is hospitalized for altered mental status, generalized weakness, and constipation over the past 48 hours. He has a history of advanced squamous cell carcinoma of the lung. On physical examination, he is lethargic but arousable. Mucous membranes are extremely dry.

Initial laboratory studies show:
- Serum calcium: 14.8 mg/dL
- Serum albumin: 4.0 g/dL
- Blood urea nitrogen: 52 mg/dL
- Serum creatinine: 2.9 mg/dL (baseline 1.1 mg/dL)

The patient is immediately started on aggressive intravenous normal saline resuscitation. After receiving 3 liters of normal saline over the next 12 hours, his mental status improves slightly. A repeat serum calcium level is 13.5 mg/dL. He has clear lung fields and no peripheral edema. His urine output has been 80 mL/hr for the last 4 hours. Which of the following is the most appropriate next step in the pharmacologic management of this patient's hypercalcemia?

Show answer & explanation

Answer: Subcutaneous calcitonin

Answer

The most appropriate next step is to administer subcutaneous calcitonin, as it lowers serum calcium rapidly and is safe to use in the setting of acute kidney injury.
The correct answer is subcutaneous calcitonin. This patient is experiencing severe hypercalcemia of malignancy, which has led to profound dehydration and subsequent acute kidney injury (AKI). The initial standard of care is aggressive volume resuscitation with isotonic normal saline, which has been appropriately initiated. However, further pharmacologic intervention is required to safely lower the calcium level. Calcitonin acts rapidly (within 4 to 6 hours) to inhibit osteoclast activity and increase renal calcium excretion. Crucially, it is completely safe to administer in the setting of AKI. Although its effect is transient due to tachyphylaxis (usually diminishing after 48 hours), it provides an essential bridge for acute calcium control.

Step-by-Step Solution

1
Identify the etiology and severity of the condition.
The patient has severe hypercalcemia of malignancy (likely PTHrP-mediated due to squamous cell carcinoma) accompanied by acute kidney injury from profound volume depletion.
Establishing the mechanism and complications dictates the safety profile required for pharmacotherapy.
2
Evaluate the patient's response to initial therapy.
Aggressive IV normal saline has modestly lowered the calcium level (from 14.8 to 13.5 mg/dL) and improved perfusion, but the patient remains significantly hypercalcemic.
Fluids alone are rarely sufficient for severe hypercalcemia; adjuvant pharmacotherapy must be added once volume is expanding.
3
Select the appropriate pharmacologic agent while observing contraindications.
Subcutaneous calcitonin is selected because it works rapidly and lacks nephrotoxicity, whereas bisphosphonates (like zoledronic acid) are absolutely contraindicated due to the acute kidney injury.
Avoidance of nephrotoxins prevents irreversible renal damage, while calcitonin provides the necessary immediate serum calcium reduction.

Key Concept

In patients with severe hypercalcemia of malignancy complicated by acute kidney injury, bisphosphonates are contraindicated. Subcutaneous calcitonin should be administered for rapid calcium lowering, often followed by denosumab for sustained management.
Question 176Question →

Friends hastily transport a 28-year-old male to the trauma and resuscitation bay after he abruptly developed severe respiratory distress and facial swelling during a seafood dinner. Upon arrival, the patient is clutching his throat, phonating only in single words, and exhibiting marked periorbital edema along with swollen lips. He has no known medical conditions and takes no daily medications. Initial vital signs reveal a temperature of 37.0°C (98.6°F), blood pressure of 76/40 mm Hg, heart rate of 142/min, respiratory rate of 32/min, and oxygen saturation of 86% on room air. Auscultation of the neck and chest demonstrates a high-pitched inspiratory sound and widespread expiratory wheezing. His skin is warm, hyperemic, and covered with raised, pruritic plaques. Which of the following interventions must be initiated simultaneously for the immediate stabilization of this patient? (Select all that apply.)

Select all that apply

Show answer & explanation

Answer: Intramuscular injection of epinephrine in the anterolateral thigh; Rapid intravenous infusion of isotonic crystalloid; Application of high-flow oxygen via a nonrebreather mask

Answer

The correct immediate stabilization steps are the intramuscular injection of epinephrine, rapid intravenous infusion of isotonic crystalloid, and application of high-flow oxygen.
The clinical presentation of severe hypotension, hypoxia, stridor (indicating laryngeal edema), and diffuse urticaria shortly after seafood ingestion is classic for severe anaphylaxis. Anaphylaxis is a life-threatening, IgE-mediated hypersensitivity reaction that demands immediate, simultaneous stabilization of the airway, breathing, and circulation. The primary life-saving intervention is the intramuscular injection of epinephrine, which rapidly stimulates alpha-1 receptors to reverse peripheral vasodilation and beta-2 receptors to dilate the airways. Concurrently, the profound distributive shock caused by massive capillary leak must be addressed with aggressive volume resuscitation using intravenous isotonic crystalloids. Additionally, given the patient's critical hypoxia and impending airway compromise, the application of high-flow oxygen is a mandatory simultaneous step to maximize tissue oxygenation while pharmacologic therapies begin to take effect.

Step-by-Step Solution

1
Evaluate the patient's primary survey and vital signs.
The patient demonstrates severe respiratory distress, stridor, significant hypoxia (SpO2 86%), and profound hypotension (76/40 mm Hg).
Identifying immediate airway compromise and shock establishes the absolute priority of life-saving resuscitative measures over diagnostic workup.
2
Recognize the specific clinical syndrome causing the instability.
The combination of sudden-onset shock, upper airway obstruction, wheezing, and widespread urticaria following a high-risk allergen exposure indicates severe anaphylaxis.
Accurate and rapid clinical diagnosis is essential because anaphylactic shock requires specific, immediate pharmacologic reversal.
3
Determine the necessary simultaneous stabilization orders.
The patient requires immediate intramuscular epinephrine, aggressive intravenous fluid resuscitation, and high-flow oxygen.
Epinephrine reverses vasodilation and bronchoconstriction, isotonic fluids treat the profound distributive shock, and oxygen addresses the critical hypoxia.

Key Concept

Initial stabilization of severe anaphylaxis requires the simultaneous administration of intramuscular epinephrine, aggressive intravenous fluid resuscitation, and supplemental oxygen before any diagnostic testing or secondary adjunctive therapies.
Question 177Question →

An unresponsive 32-year-old male is wheeled into the resuscitation bay by his coworkers, who drove him directly from their office building across the street. The colleagues state that the patient began experiencing severe throat tightness, a harsh cough, and profound dizziness just minutes after taking a bite of a catered Thai peanut dish.

Initial vital signs on the monitors show:
Blood pressure: 60/40 mmHg
Heart rate: 148/min (sinus tachycardia)
Respiratory rate: 36/min
Oxygen saturation: 81% on room air
Temperature: 36.9°C (98.4°F)

On physical examination, the patient is deeply obtunded. His face and lips are profoundly swollen, and there is audible high-pitched inspiratory stridor. Auscultation of the chest reveals almost silent lung fields with minimal air entry. Widespread erythematous, raised wheals are visible on his chest and arms. Two large-bore peripheral intravenous lines are immediately established.

Which of the following are the most appropriate simultaneous initial management steps? (Select all that apply)

Select all that apply

Show answer & explanation

Answer: Intramuscular administration of epinephrine; Immediate endotracheal intubation

Answer

The correct simultaneous interventions are intramuscular administration of epinephrine and immediate endotracheal intubation.
The patient is presenting with severe, rapidly progressive anaphylactic shock complicated by impending airway occlusion. In this critically unstable scenario, two life-threatening problems must be addressed concurrently. First, the profound hypotension and bronchoconstriction demand the immediate administration of intramuscular epinephrine, which is the cornerstone of anaphylaxis resuscitation. Second, the presence of an altered mental status, severe hypoxia (81%), and inspiratory stridor indicates critical laryngeal edema and a rapidly closing airway. Because medication alone may not reverse the edema fast enough to prevent asphyxiation in a crashing patient, definitive airway management via endotracheal intubation must be performed simultaneously. These concurrent steps represent the proper application of standard emergency stabilization principles.

Step-by-Step Solution

1
Identify the underlying clinical syndrome.
The patient is experiencing severe anaphylactic shock triggered by a food allergen, characterized by distributive shock (BP 60/40 mmHg) and critical airway compromise (stridor, SpO2 81%).
Rapid recognition of anaphylaxis is required to initiate life-saving protocols before cardiac arrest occurs.
2
Prioritize the initial stabilization steps based on the ABCs (Airway, Breathing, Circulation).
The patient has critical 'Airway' compromise requiring securement, and severe 'Circulation' failure requiring vasopressor/inotropic support.
In catastrophic presentations, interventions addressing airway and circulatory collapse must occur simultaneously.
3
Select the specific immediate interventions.
Intubate the patient to secure the rapidly closing airway, while concurrently administering intramuscular epinephrine to reverse the systemic vasodilation and bronchoconstriction.
These two steps directly treat the immediate physiological life threats, unlike secondary medications which have a delayed onset.

Key Concept

The initial stabilization of severe anaphylactic shock requires concurrent life-saving interventions: immediate intramuscular epinephrine to reverse cardiovascular collapse, and aggressive airway management (endotracheal intubation) for impending laryngeal obstruction.
Question 178Question →

A 62-year-old man with a history of alcohol-associated cirrhosis (Child-Pugh class C) is brought to the emergency department by his daughter due to increased confusion and abdominal pain over the past 2 days. Home medications include furosemide, spironolactone, nadolol, lactulose, and rifaximin.

On physical examination, temperature is 38.2∘C38.2^\circ\text{C} (100.8∘F100.8^\circ\text{F}), blood pressure is 88/56 mmHg, and heart rate is 108/min. The patient is lethargic but arousable and oriented only to person. Scleral icterus is present. The abdomen is distended with a positive fluid wave and diffuse mild tenderness to palpation. Asterixis is elicited.

Laboratory results:
TestValue
Sodium130 mEq/L
Potassium4.8 mEq/L
Blood urea nitrogen45 mg/dL
Creatinine2.5 mg/dL (baseline 1.0 mg/dL)
Total bilirubin4.8 mg/dL

Diagnostic paracentesis is performed. Ascitic fluid analysis reveals a total protein of 1.2 g/dL and a white blood cell count of 850/mm³ with 80% neutrophils.

Which of the following pharmacologic interventions are appropriate for the initial management of this patient? (Select all that apply)

Select all that apply

Show answer & explanation

Answer: Initiate intravenous cefotaxime; Administer intravenous albumin; Discontinue nadolol

Answer

The correct interventions include initiating intravenous cefotaxime, administering intravenous albumin, and discontinuing nadolol.
The patient has spontaneous bacterial peritonitis (SBP), defined by an ascitic fluid absolute neutrophil count >250/mm3>250/\text{mm}^3. Initial management requires a third-generation cephalosporin (cefotaxime). Furthermore, intravenous albumin is indicated to prevent hepatorenal syndrome (HRS), as the patient meets high-risk criteria (creatinine > 1.0 mg/dL, BUN > 30 mg/dL). Finally, nonselective beta-blockers (nadolol) must be discontinued in the setting of SBP, hypotension, and acute kidney injury to avoid further impairment of cardiac output and renal perfusion.

Step-by-Step Solution

1
Calculate the absolute neutrophil count (ANC) in the ascitic fluid.
ANC is 850×0.80=680/mm3850 \times 0.80 = 680/\text{mm}^3.
An ANC >250/mm3>250/\text{mm}^3 is diagnostic for spontaneous bacterial peritonitis (SBP).
2
Select empiric antibiotic therapy.
Initiate an intravenous third-generation cephalosporin (e.g., cefotaxime).
SBP requires immediate empiric coverage targeting enteric Gram-negative organisms.
3
Assess renal function and indications for albumin.
Administer intravenous albumin.
The patient has an acute kidney injury (AKI) with a creatinine of 2.5 mg/dL; albumin infusion decreases the incidence of hepatorenal syndrome and mortality in SBP patients with high-risk features.
4
Review home medications for potential harm.
Discontinue nadolol.
Nonselective beta-blockers decrease cardiac output and worsen renal hypoperfusion in patients with decompensated cirrhosis presenting with AKI and hypotension.
5
Evaluate the indication for vasoconstrictors like terlipressin.
Withhold terlipressin at this time.
Hepatorenal syndrome cannot be diagnosed until volume depletion is formally ruled out with 48 hours of albumin challenge.

Key Concept

Management of spontaneous bacterial peritonitis (SBP) with acute kidney injury, including empiric antibiotics, albumin infusion, and withholding of contraindicated antihypertensive and diuretic medications.
Estimated Time:1m 30s
Question 179Question →

A 28-year-old male pedestrian is struck by a commercial truck moving at high speed. He is brought to the emergency resuscitation bay by paramedics on a backboard with a rigid cervical collar in place. Upon arrival, the patient is obtunded and withdraws only to painful stimuli. Vital signs are temperature 36.2°C (97.2°F), heart rate 142/min, blood pressure 72/40 mm Hg, respiratory rate 26/min, and oxygen saturation 93% on a non-rebreather mask. Physical examination reveals an unstable pelvis that rocks easily on gentle anteroposterior compression. There is a rapidly expanding scrotal hematoma and a visible drop of blood at the urethral meatus. The abdomen is visibly distended, tense, and diffusely tender. A bedside Focused Assessment with Sonography for Trauma (FAST) examination reveals an anechoic stripe in the hepatorenal recess (Morison's pouch). Which of the following interventions should be executed simultaneously as part of this patient's immediate stabilization? (Select all that apply)

Select all that apply

Show answer & explanation

Answer: Endotracheal intubation; Application of a pelvic circumferential compression device; Activation of the massive transfusion protocol with uncrossmatched blood

Answer

The most appropriate immediate next steps include endotracheal intubation, application of a pelvic circumferential compression device, and activation of the massive transfusion protocol.
In a critically ill polytrauma patient, initial stabilization steps must occur simultaneously rather than sequentially. This patient requires endotracheal intubation for airway protection due to his depressed mental status. Concurrently, he requires aggressive management of hemorrhagic shock via two pathways: mechanical bleeding control with a pelvic circumferential compression device (to tamponade retroperitoneal bleeding from the unstable pelvic fracture) and physiologic resuscitation via the massive transfusion protocol utilizing uncrossmatched blood products.

Step-by-Step Solution

1
Assess the patient's airway and neurological status.
The patient is obtunded, withdrawing only to pain (estimated GCS ≤ 8), indicating an inability to protect his airway.
Definitive airway management (intubation) is the first priority in the ATLS protocol (Airway), especially prior to initiating massive fluid resuscitation.
2
Evaluate the patient's hemodynamic status and sources of hemorrhage.
The patient is in profound shock (BP 72/40, HR 142) with a positive FAST scan and an unstable pelvis.
Identifies the need for immediate, simultaneous mechanical hemorrhage control (pelvic binder) and physiologic volume replacement (massive transfusion protocol).
3
Identify contraindications to standard trauma protocols.
Blood at the urethral meatus and scrotal hematoma are present.
Precludes the placement of a Foley catheter, which would otherwise be standard for monitoring resuscitation.
4
Determine the appropriate patient disposition following initial bay stabilization.
The patient remains hemodynamically unstable with identified surgical/angiographic bleeding sources.
Dictates immediate transfer to the operating room or angiography suite, strictly bypassing advanced imaging (CT scan).

Key Concept

Initial stabilization of the unstable polytrauma patient requires simultaneous execution of airway protection, mechanical hemorrhage control, and balanced blood product resuscitation, explicitly deferring advanced imaging and contraindicated procedures until definitive operative or angiographic management is underway.
Question 180Question →

A 35-year-old male is transported to the resuscitation bay by paramedics following a diving accident in a shallow pool. He struck his head on the bottom of the pool. Upon arrival, he is conscious and communicative but completely unable to move his upper or lower extremities.

Initial vital signs show a temperature of 36.0°C (96.8°F), a blood pressure of 75/40 mm Hg, a heart rate of 48/min, and a respiratory rate of 8/min with shallow effort. Pulse oximetry displays 86% on room air.

Neurologic examination demonstrates flaccid paralysis and absent deep tendon reflexes across all four limbs, with a lack of sensation to pinprick below the clavicular line. His extremities are warm and flushed.

Arrange the following management steps in the most appropriate chronological order for this patient's initial stabilization and triage.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence strictly follows the Advanced Trauma Life Support (ATLS) primary survey: secure the airway (intubation), resuscitate circulation (fluids, then vasopressors for neurogenic shock), perform resuscitation adjuncts (urinary catheter), and finally obtain definitive imaging (MRI).
This patient presents with a high cervical spinal cord injury resulting in respiratory failure and neurogenic shock. The correct management sequence must strictly adhere to the Advanced Trauma Life Support (ATLS) primary survey. First, Airway: The patient's respiratory rate of 8/min and hypoxia indicate impending respiratory failure due to phrenic nerve impairment (C3-C5). Endotracheal intubation with in-line cervical stabilization is the absolute first priority. Second, Circulation (Fluids): The patient exhibits neurogenic shock (hypotension, bradycardia, flushed skin). However, an initial fluid bolus is always the first step for trauma-induced hypotension to address potential concurrent hypovolemia. Third, Circulation (Vasopressors): Because neurogenic shock is characterized by loss of systemic vascular resistance, fluids alone are insufficient. Vasopressors are added next to maintain a mean arterial pressure (MAP) of 85-90 mm Hg, which is critical for spinal cord perfusion. Fourth, Adjuncts: Acute spinal cord injury causes areflexia and urinary retention. Placing a urinary catheter is a standard adjunct performed after the ABCs are stabilized. Finally, Definitive Imaging: MRI is the gold standard for evaluating spinal cord injury but must be deferred until the patient is completely stabilized.

Step-by-Step Solution

1
Assess and secure the airway (Airway)
Perform endotracheal intubation with in-line cervical stabilization.
The patient has inadequate ventilation and hypoxia due to a high cervical cord injury. This is the most immediate life-threat and must be addressed first.
2
Address hemodynamic instability (Circulation - Initial)
Administer an intravenous crystalloid fluid bolus.
Initial treatment of hypotension in any trauma patient requires fluids to exclude concurrent hemorrhagic hypovolemia, even when neurogenic shock is strongly suspected.
3
Provide targeted therapy for neurogenic shock (Circulation - Secondary)
Initiate a vasopressor infusion.
Fluids alone are usually insufficient for neurogenic shock, which is driven by a profound loss of sympathetic tone. Vasopressors restore systemic vascular resistance to perfuse the injured spinal cord.
4
Perform primary survey adjuncts
Place a urinary catheter.
Spinal shock causes acute urinary retention. Decompressing the bladder is necessary but should only be done after the primary survey (ABCs) is fully addressed.
5
Obtain definitive diagnostic imaging
Perform MRI of the cervical spine.
Advanced imaging requires moving the patient to an isolated environment (the MRI suite) and must only be done once the patient's airway and hemodynamics are completely stabilized.

Key Concept

In acute spinal cord injury with neurogenic shock, initial stabilization strictly follows the ATLS primary survey (Airway, Breathing, Circulation) prior to diagnostic adjuncts and definitive imaging. Fluid resuscitation must precede vasopressor therapy to rule out hypovolemia.
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