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Surgery

1344 questions

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Question 961Question →

A 4242-year-old woman presents to the emergency department with a 44-hour history of sudden-onset, severe, colicky periumbilical pain that radiates to her back. She also reports several episodes of severe nausea and nonbilious emesis. Her medical history is notable for morbid obesity treated with a laparoscopic Roux-en-Y gastric bypass 33 years ago. Her temperature is 37.2∘C37.2^\circ\text{C} (99.0∘F99.0^\circ\text{F}), blood pressure is 135/85 mm Hg135/85\text{ mm Hg}, pulse is 112/min112/\text{min}, and respirations are 18/min18/\text{min}. On physical examination, her abdomen is soft and non-distended but exquisitely tender to deep palpation in the mid-abdomen. There is no rebound tenderness or muscle guarding. Bowel sounds are hyperactive. Laboratory studies show a leukocyte count of 9,500/mm39,500/\text{mm}^3 and a serum lactate level of 1.2 mmol/L1.2\text{ mmol/L} (normal: 0.5−2.2 mmol/L0.5-2.2\text{ mmol/L}). A computed tomography scan of the abdomen and pelvis with intravenous contrast reveals a cluster of dilated small bowel loops in the left upper quadrant and a swirling pattern of the mesenteric vessels at the root of the mesentery. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Immediate surgical exploration

Answer

Immediate surgical exploration
The correct answer is immediate surgical exploration. This patient presents with a small bowel obstruction three years after a Roux-en-Y gastric bypass. The hallmark CT finding of a 'swirling pattern' (whirl sign) at the mesenteric root indicates a volvulus, which in this context is highly diagnostic of an internal hernia. Internal hernias are common complications of Roux-en-Y gastric bypass due to the creation of mesenteric defects (e.g., Petersen's space). They frequently present as closed-loop obstructions, where a segment of bowel is obstructed at two distinct points. This traps fluid and gas, leading to rapid increases in intraluminal pressure, compromised venous outflow, arterial insufficiency, and eventually bowel necrosis and perforation. Because of the extremely high risk of rapid progression to ischemia, closed-loop obstructions are surgical emergencies. Even though this patient currently lacks peritoneal signs and has normal lactate and leukocyte levels, emergent operative exploration is mandatory to untwist the bowel and prevent irreversible ischemia.

Step-by-Step Solution

1
Identify the patient's surgical history
The patient had a Roux-en-Y gastric bypass 3 years ago.
This history is critical as it predisposes the patient to specific late complications, namely internal hernias due to created mesenteric defects.
2
Interpret the clinical presentation and imaging findings
The patient has severe colicky pain with a CT showing dilated small bowel loops and a 'swirling pattern' (whirl sign) of the mesentery.
These findings are highly specific for a volvulus or internal hernia resulting in a closed-loop small bowel obstruction.
3
Determine the appropriate management based on the diagnosis
The correct management is immediate surgical exploration.
Closed-loop obstructions rapidly progress to bowel ischemia and necrosis due to isolated vascular compromise. They require emergent surgery regardless of stable vitals or normal laboratory markers.

Key Concept

Internal hernias are a common late complication of Roux-en-Y gastric bypass and frequently cause closed-loop small bowel obstructions. These require immediate surgical exploration due to the high risk of rapid bowel ischemia, even in the absence of peritonitis or abnormal laboratory findings.
Question 962Question →

Surgical consultation is requested for a 58-year-old male inpatient whose clinical status acutely deteriorated on the seventh day following an elective open right hemicolectomy for a large cecal adenoma. His recovery was initially unremarkable; he tolerated a liquid diet and passed flatus on the fourth day after surgery.

Over the past 8 hours, the patient developed sudden-onset, severe, and continuous abdominal pain. He reports the pain is agonizing and poorly relieved by intravenous morphine. He has had two episodes of non-bilious emesis.

Vital signs:
ParameterValue
Temperature38.3∘C38.3^\circ\text{C} (100.9∘F100.9^\circ\text{F})
Blood Pressure102/64 mm Hg102/64\text{ mm Hg}
Heart Rate118/min118/\text{min}
Respiratory Rate24/min24/\text{min}
SpO2_296%96\% on room air

Physical examination reveals a moderately distended abdomen. The midline surgical incision is clean and intact without erythema or fluctuance. Palpation elicits mild diffuse tenderness but no rebound, guarding, or rigidity. Bowel sounds are hypoactive.

Laboratory evaluation:
TestResultReference Range
Leukocytes18,200/mm318,200/\text{mm}^3 (16%16\% bands)4,000−11,000/mm34,000-11,000/\text{mm}^3
Hemoglobin13.8 g/dL13.8\text{ g/dL}13.5−17.5 g/dL13.5-17.5\text{ g/dL}
Serum Sodium138 mEq/L138\text{ mEq/L}136−145 mEq/L136-145\text{ mEq/L}
Serum Potassium4.2 mEq/L4.2\text{ mEq/L}3.5−5.0 mEq/L3.5-5.0\text{ mEq/L}
Serum Bicarbonate14 mEq/L14\text{ mEq/L}22−28 mEq/L22-28\text{ mEq/L}
Serum Lactate5.2 mmol/L5.2\text{ mmol/L}0.5−2.2 mmol/L0.5-2.2\text{ mmol/L}

Arterial blood gas analysis on room air shows a pH of 7.277.27, PaCO 2_2 of 32 mm Hg32\text{ mm Hg}, and PaO 2_2 of 88 mm Hg88\text{ mm Hg}.

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

Show answer & explanation

Answer: Immediate exploratory laparotomy

Answer

Immediate exploratory laparotomy
Immediate exploratory laparotomy is correct because this patient is exhibiting the classic triad of acute bowel ischemia/strangulation: severe continuous abdominal pain out of proportion to physical exam findings, systemic inflammatory response (fever, extreme leukocytosis with a left shift), and severe metabolic derangement (high anion gap metabolic acidosis with hyperlactatemia). In the post-operative setting, this is most commonly caused by an internal hernia or a closed-loop small bowel obstruction. When clinical and laboratory signs strongly point to bowel necrosis, the definitive and life-saving step is immediate surgical exploration. Delaying for imaging or attempting medical management drastically increases mortality.

Step-by-Step Solution

1
Analyze the patient's timeline and clinical symptoms.
The patient developed sudden, severe, continuous abdominal pain on postoperative day 7 that is 'out of proportion' to the physical exam findings (lack of overt peritonitis).
Differentiating severe acute catastrophic events from expected postoperative pain or simple ileus is critical.
2
Evaluate the vital signs and laboratory data.
Findings show borderline hypotension, tachycardia, fever, marked leukocytosis with bandemia, and a severe high anion gap metabolic acidosis (pH 7.27, bicarbonate 14 mEq/L) driven by hyperlactatemia (lactate 5.2 mmol/L).
Identifies the presence of systemic toxicity and critical tissue hypoperfusion.
3
Synthesize the clinical and laboratory picture to form a diagnosis.
The combination of severe continuous pain out of proportion to exam findings and lactic acidosis strongly indicates acute bowel ischemia, likely from a strangulated internal hernia or closed-loop obstruction.
These are the hallmark signs of bowel necrosis, distinguishing it from an uncomplicated post-operative ileus or simple obstruction.
4
Determine the most appropriate definitive management.
The patient must undergo an immediate exploratory laparotomy.
Ischemic bowel is a surgical emergency; delaying for advanced imaging or attempting conservative medical management leads to rapid clinical deterioration and high mortality.

Key Concept

Diagnosis and management of postoperative bowel ischemia and strangulating obstruction.
Question 963Question →

A 22-year-old man is evaluated in the trauma intensive care unit for acute-onset respiratory distress and altered mental status. Twenty hours ago, he was involved in a motorcycle collision, sustaining a closed, comminuted fracture of the right femoral shaft and a nondisplaced fracture of the left radius. He was initially hemodynamically stabilized, splinted, and placed in skeletal traction while awaiting definitive surgical fixation. His current temperature is 37.9°C (100.2°F), blood pressure is 112/68 mm Hg, pulse is 126/min, and respiratory rate is 28/min. Pulse oximetry reveals an oxygen saturation of 86% on room air. Physical examination demonstrates scattered, non-blanching erythematous macules over the anterior chest and axillae. Lung auscultation reveals bilateral diffuse crackles. Neurologic examination shows a restless and confused patient without focal motor or sensory deficits. Which of the following is the most likely diagnosis?

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Answer: Fat embolism syndrome

Answer

The correct answer is fat embolism syndrome.
The correct answer describes a condition that classically presents with a triad of respiratory distress, neurologic abnormalities, and a petechial rash in patients who have recently sustained long bone or pelvic fractures. The marrow fat enters the venous circulation, leading to both mechanical obstruction of pulmonary capillaries and a systemic inflammatory response, typically manifesting 12 to 72 hours post-injury.

Step-by-Step Solution

1
Analyze the patient's initial injury and timeline.
The patient sustained a comminuted long bone fracture (femur) and is 20 hours post-injury.
Identifying the mechanism and timing of injury narrows the differential diagnosis for severe post-trauma complications.
2
Evaluate the new-onset clinical signs and symptoms.
The patient developed a triad of respiratory distress (hypoxia, tachypnea), neurologic dysfunction (confusion, restlessness), and a petechial rash over the chest and axillae.
Recognizing this specific combination of findings is essential for pinpointing the underlying systemic etiology.
3
Synthesize the findings to establish the diagnosis.
The combination of a recent long bone fracture and the classic triad of symptoms confirms the diagnosis.
Disruption of the bone marrow releases fat globules into the systemic circulation, which classically triggers this specific syndrome within 12 to 72 hours of injury.

Key Concept

Fat embolism syndrome typically presents with the classic triad of respiratory distress, neurologic abnormalities, and a petechial rash within 12 to 72 hours following a severe long bone or pelvic fracture.
Question 964Question →

A 75-year-old man is brought to the emergency department from an assisted living facility due to progressively worsening abdominal distension and failure to pass stool or flatus for the past 3 days. His medical history includes chronic constipation, hypertension, and schizophrenia. His vital signs are temperature 37.1°C (98.8°F), blood pressure 130/80 mmHg, pulse 85/min, and respirations 16/min. On physical examination, the abdomen is massively distended and tympanitic to percussion, but there is no guarding or rebound tenderness. Digital rectal examination reveals an empty rectal vault. An upright abdominal X-ray demonstrates a markedly dilated loop of colon extending from the pelvis toward the right upper quadrant, resembling a "coffee bean," with no evidence of pneumoperitoneum. Which of the following is the most appropriate next step in management?

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Answer: Flexible sigmoidoscopy

Answer

Flexible sigmoidoscopy is the most appropriate next step to therapeutically untwist the colon.
The correct answer is flexible sigmoidoscopy. This patient presents with the classic clinical and radiographic findings of a sigmoid volvulus, notably the characteristic "coffee bean" sign on an upright abdominal X-ray. In a hemodynamically stable patient without any evidence of peritonitis, bowel ischemia, or perforation, the most appropriate initial step is endoscopic detorsion using flexible sigmoidoscopy. This procedure is both diagnostic and therapeutic, allowing the clinician to untwist the affected bowel segment and place a rectal tube to maintain decompression and prevent immediate recurrence.

Step-by-Step Solution

1
Identify the primary diagnosis based on the clinical presentation and radiographic imaging.
The patient has symptoms of a large bowel obstruction with a classic "coffee bean" sign on X-ray, which confirms the diagnosis of a sigmoid volvulus.
Establishing the correct etiology of the obstruction is essential before determining the appropriate intervention.
2
Assess the patient's clinical stability and look for signs of complications.
The patient has stable vital signs, a non-peritonitic abdomen (no guarding or rebound tenderness), and no free air on the X-ray, indicating an uncomplicated volvulus.
The presence of bowel ischemia or perforation completely changes the management pathway from endoscopic to surgical.
3
Select the most appropriate initial management for an uncomplicated sigmoid volvulus.
Flexible sigmoidoscopy.
Endoscopic detorsion is the first-line therapeutic step for a stable patient, allowing the bowel to be untwisted and decompressed.

Key Concept

Management of uncomplicated sigmoid volvulus
Estimated Time:1m 0s
Question 965Question →

A 53-year-old woman is brought to the acute care clinic by her spouse due to severe abdominal discomfort. She underwent an uncomplicated laparoscopic cholecystectomy 6 weeks ago. Over the past 48 hours, she developed abdominal swelling, obstipation, and bilious emesis. During the last 2 hours, her pain transitioned from an intermittent crampy sensation to a constant, excruciating ache.

Vital signs reveal a temperature of 39.1∘C39.1^\circ\text{C} (102.4∘F102.4^\circ\text{F}), heart rate of 132 /min132\text{ /min}, respiratory rate of 26 /min26\text{ /min}, and blood pressure of 82/50 mmHg82/50\text{ mmHg}.

Physical examination demonstrates a markedly distended, rigid abdomen with diffuse rebound tenderness and involuntary guarding. Bowel sounds are absent.

Laboratory analysis reveals:
TestValue
Leukocyte count21,500/mm321,500/\text{mm}^3
Lactic acid5.8 mmol/L5.8\text{ mmol/L}
Arterial pH7.267.26
Arterial pCO2\text{pCO}_228 mmHg28\text{ mmHg}
Arterial HCO3−\text{HCO}_3^-12 mEq/L12\text{ mEq/L}

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

Show answer & explanation

Answer: Immediate exploratory laparotomy

Answer

The correct management is immediate exploratory laparotomy.
The patient's clinical presentation is highly concerning for a small bowel obstruction (SBO) that has progressed to strangulation and ischemia. Classic indicators of strangulated SBO include a shift from colicky, intermittent pain to severe, constant pain, accompanied by systemic toxicity (fever, tachycardia, hypotension), peritonitis (rigidity, rebound tenderness), and profound lactic acidosis. In the setting of a surgical acute abdomen with hemodynamic instability, the definitive and sole appropriate next step is immediate exploratory laparotomy for source control and resection of the necrotic bowel.

Step-by-Step Solution

1
Analyze the clinical history and physical examination findings.
The patient has a history of recent abdominal surgery followed by progressive obstipation and emesis, suggesting a small bowel obstruction. The transition to constant pain, alongside a rigid abdomen and rebound tenderness, indicates peritonitis.
Identifying the transition from a simple obstruction to an acute surgical abdomen is critical for management.
2
Evaluate the vital signs and laboratory data to assess physiological stability.
The patient is in septic shock (hypotension, tachycardia, fever) and exhibits severe lactic acidosis, pointing toward bowel ischemia and impending or actual perforation.
Hemodynamic instability dictates whether a patient can safely undergo further diagnostic testing or requires emergent intervention.
3
Select the appropriate intervention based on the diagnosis and stability.
Because the patient has a strangulated small bowel obstruction with hemodynamic collapse, emergent surgical exploration is required to perform source control and resect ischemic bowel.
Delaying surgery for imaging or persisting with conservative measures in this setting rapidly leads to mortality.

Key Concept

Surgical management of strangulated small bowel obstruction
Question 966Question →

A 71-year-old man is evaluated on the surgical ward on postoperative day 4 after an open distal pancreatectomy. His past medical history is significant for chronic obstructive pulmonary disease and ischemic heart disease. Over the past 12 hours, he has developed progressively worsening shortness of breath and a new cough productive of yellow-green sputum. Temperature is 38.6°C (101.5°F), pulse is 112/min, respirations are 24/min, and blood pressure is 130/82 mm Hg. Oxygen saturation is 91% on room air. Cardiovascular examination reveals a regular rhythm with no murmurs, and the jugular venous pressure is normal. Pulmonary auscultation reveals focal coarse crackles and egophony over the right lower lung field, without wheezing. The abdominal incision is clean and well-approximated. A portable chest radiograph demonstrates a new consolidation in the right lower lobe. Which of the following is the most appropriate next step in the management of this patient's condition?

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Answer: Collect respiratory and blood samples for culture prior to starting antimicrobial agents

Answer

The most appropriate next step is to collect respiratory and blood samples for culture prior to starting antimicrobial agents.
The correct answer is to collect respiratory and blood samples for culture prior to starting antimicrobial agents. This patient's presentation of fever, purulent sputum, focal lung crackles, and a new consolidation on postoperative day 4 is diagnostic of hospital-acquired pneumonia (HAP). The standard of care for HAP in a hemodynamically stable patient is to first obtain lower respiratory tract and blood cultures, followed promptly by the administration of empiric antibiotics. This sequence ensures that the causative organism can be identified, allowing for the subsequent narrowing of antibiotic therapy in accordance with antimicrobial stewardship principles.

Step-by-Step Solution

1
Analyze the clinical presentation and timing of symptoms.
The patient has a fever, purulent sputum, focal lung crackles, and a new lobar consolidation on postoperative day 4.
Identifying the timeline and focal respiratory findings helps differentiate between atelectasis, pneumonia, and fluid overload.
2
Determine the most likely diagnosis.
The clinical picture is classic for hospital-acquired pneumonia (HAP).
Atelectasis does not typically cause thick purulent sputum or dense infiltrates. Heart failure would present with JVD and bilateral edema/crackles.
3
Select the appropriate evidence-based management step for HAP.
Obtain sputum and blood cultures before administering empiric antibiotics.
In hemodynamically stable patients, securing cultures prior to starting antibiotics is essential for proper antimicrobial stewardship, allowing therapy to be narrowed once susceptibilities are known.

Key Concept

In hemodynamically stable patients with suspected hospital-acquired pneumonia, respiratory and blood cultures must be obtained prior to the initiation of empiric antimicrobial therapy to facilitate targeted treatment and support antimicrobial stewardship.
Estimated Time:1m 15s
Question 967Question →

An urgent evaluation is requested for a 4242-year-old female on the second postoperative day following a laparoscopic Roux-en-Y gastric bypass. Her medical history includes morbid obesity (body mass index 45 kg/m245\text{ kg/m}^2), obstructive sleep apnea, and mild asthma. The nursing staff reports that the patient developed sudden, severe left shoulder pain and a feeling of impending doom 3030 minutes ago. She also reports vague left-sided chest discomfort. Her temperature is 38.4∘C38.4^\circ \text{C} (101.1∘F101.1^\circ \text{F}), pulse is 135/min135/\text{min}, blood pressure is 105/65 mmHg105/65\text{ mmHg}, and respirations are 26/min26/\text{min}. Pulse oximetry shows an oxygen saturation of 94%94\% on room air. Physical examination demonstrates an obese, soft abdomen with moderate tenderness located in the left upper quadrant. The laparoscopic port sites appear clean and intact. Lung auscultation reveals diminished breath sounds over the left base, but no crackles or wheezes. Cardiac examination shows regular tachycardia without murmurs. Which of the following is the most appropriate next step in the management of this patient?

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Answer: Order an abdominal computed tomography scan with oral contrast

Answer

The most appropriate next step is to order an abdominal computed tomography scan with oral contrast.
This patient's presentation of sudden tachycardia, fever, tachypnea, and left shoulder pain on postoperative day 2 following a Roux-en-Y gastric bypass is highly suspicious for a gastrojejunal anastomotic leak. Unexplained tachycardia is often the earliest clinical sign of a leak. The left shoulder pain (Kehr sign) is classic for diaphragmatic irritation from leaked gastric or enteric contents. Since the patient is currently hemodynamically stable, the most appropriate next step is to obtain imaging to definitively diagnose the leak. This is typically accomplished via an abdominal CT scan with oral contrast or an upper gastrointestinal series using water-soluble contrast. If she were hemodynamically unstable, immediate surgical exploration would be indicated.

Step-by-Step Solution

1
Analyze the clinical timeline and vital signs.
The patient is on postoperative day 2 following bariatric surgery and has developed sudden tachycardia (135/min135/\text{min}), tachypnea, and fever.
Unexplained tachycardia out of proportion to fever is often the earliest and most sensitive clinical sign of a gastrojejunal anastomotic leak in bariatric patients.
2
Interpret specific physical exam findings.
The patient exhibits left upper quadrant abdominal tenderness and left shoulder pain.
Left shoulder pain (Kehr sign) represents referred pain from subdiaphragmatic irritation caused by leaking acidic fluid or succus entericus from the anastomosis.
3
Determine the appropriate diagnostic modality.
Because the patient is hemodynamically stable (blood pressure 105/65 mmHg105/65\text{ mmHg}), an imaging study is required to confirm the leak.
An abdominal CT scan with oral contrast or an upper gastrointestinal fluoroscopic series with water-soluble contrast is the standard modality to visualize contrast extravasation before operative repair.

Key Concept

Recognition and diagnostic approach to anastomotic leak following bariatric surgery.
Question 968Question →

Match each clinical trauma scenario with the most appropriate definitive diagnostic or therapeutic next step.

Click a left item, then click its matching right item

Items

Stab wound to the left sixth intercostal space; the patient is hemodynamically stable with a negative focused assessment with sonography for trauma (FAST) and normal chest x-ray.
Blunt chest trauma followed by a continuous, massive air leak in the chest tube drainage system and incomplete lung re-expansion.
Hemodynamically unstable patient with an anteroposterior compression pelvic fracture; a pelvic binder is applied but hypotension persists, and the FAST exam is negative.
Posterior knee dislocation after a sports injury; the patient is normotensive but has diminished distal pulses and an ankle-brachial index of 0.8.
Gunshot wound to the medial thigh presenting with an rapidly expanding, pulsatile hematoma and absent dorsalis pedis pulses.

Matches

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Answer

The correct pairings align the clinical signs with their ATLS-directed management: occult diaphragmatic injury risk warrants diagnostic laparoscopy, suspected tracheobronchial tears require bronchoscopy, unstable pelvic fractures with negative FAST need pelvic angiography, soft signs of vascular injury mandate CT angiography, and hard signs of vascular injury necessitate immediate surgical exploration.
Optimal trauma management depends on integrating the mechanism of injury, hemodynamic status, and physical exam findings. The selected interventions correctly differentiate between the need for immediate operative control (hard signs of vascular injury), imaging to localize occult injuries (soft vascular signs, diaphragmatic evaluation), and specific endovascular or endoscopic modalities (pelvic bleeding, tracheobronchial tears) according to ATLS protocols.

Step-by-Step Solution

1
Analyze the mechanism of injury and anatomical zone for each patient.
Identified specific injury risks (e.g., thoracoabdominal zone risk for diaphragmatic laceration, knee dislocation risk for popliteal artery injury).
Trauma management is highly dependent on the predictable injury patterns associated with specific mechanisms.
2
Evaluate hemodynamic status and specific physical exam findings.
Differentiated between stable patients needing diagnostic imaging (CT angio, laparoscopy) and unstable/hard-sign patients needing immediate intervention (surgery, pelvic angio).
Hemodynamic instability or the presence of hard signs supersedes the need for diagnostic imaging.
3
Apply ATLS algorithms to determine the definitive next step.
Matched each presentation to the single best diagnostic or therapeutic modality.
Standardized trauma protocols dictate these specific steps to minimize mortality and morbidity.

Key Concept

Advanced Trauma Life Support (ATLS) algorithms for definitive diagnosis and management based on mechanism, hemodynamic stability, and physical exam findings.
Question 969Question →

A 54-year-old female pedestrian is transported to the trauma bay after being struck by a public transit bus. Upon arrival, she is lethargic and pale. Her blood pressure is 75/40 mmHg, heart rate is 138/min, and respiratory rate is 26/min. The airway is patent, and breath sounds are equal bilaterally. Physical examination reveals extensive ecchymoses over the lower abdomen and flanks. There is a palpable diastasis of the pubic symphysis, and the pelvis is mechanically unstable to anteroposterior compression. An initial point-of-care ultrasound of the chest and abdomen shows no evidence of pericardial, pleural, or intraperitoneal fluid. An anteroposterior pelvic radiograph confirms a severely displaced open-book pelvic fracture. A circumferential non-invasive pelvic binder is promptly placed over the greater trochanters. Following the administration of two units of uncrossmatched type O-negative packed red blood cells, her blood pressure remains 78/42 mmHg and heart rate is 135/min. Which of the following is the most appropriate next step in the management of this patient?

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Answer: Fluoroscopic percutaneous arterial embolization

Answer

The correct answer is fluoroscopic percutaneous arterial embolization (or preperitoneal pelvic packing).
The correct answer is fluoroscopic percutaneous arterial embolization. This patient is experiencing hemorrhagic shock secondary to a severe pelvic ring disruption. In the setting of an unstable pelvic fracture, initial management dictates mechanical stabilization with a non-invasive pelvic binder to reduce pelvic volume and tamponade venous bleeding. If the patient remains hemodynamically unstable despite binding and initial blood product resuscitation, and intraperitoneal hemorrhage has been ruled out (via a negative point-of-care ultrasound), the most likely source of ongoing blood loss is arterial (e.g., branches of the internal iliac artery). The appropriate next intervention is pelvic angiography with embolization (or preperitoneal pelvic packing, depending on institutional protocol and resources). Proceeding to this step provides definitive hemorrhage control for bleeding that is refractory to mechanical compression.

Step-by-Step Solution

1
Assess the primary survey and hemodynamic status.
The patient is in class III/IV hemorrhagic shock.
Vital signs demonstrate severe hypotension and tachycardia following high-energy blunt trauma.
2
Identify the source of hemorrhage.
Point-of-care ultrasound is negative for intracavitary bleeding; however, clinical and radiographic findings confirm a mechanically unstable pelvic fracture.
In blunt trauma, major blood loss typically occurs in the chest, abdomen, pelvis, or long bones. A negative ultrasound effectively points to the retroperitoneal pelvis as the source.
3
Institute initial hemorrhage control.
A non-invasive pelvic binder is applied to reduce pelvic volume and promote tamponade.
The majority of pelvic hemorrhage is venous and responds well to mechanical volume reduction.
4
Determine the subsequent step for refractory shock.
Arterial embolization (or preperitoneal packing) is indicated.
Persistent instability after pelvic binding and initial blood product resuscitation suggests ongoing arterial hemorrhage, which requires targeted definitive control.

Key Concept

Management of hemodynamically unstable pelvic fractures
Question 970Question →

A 7272-year-old male is in the intensive care unit eight days after endovascular repair for a ruptured descending thoracic aortic aneurysm. His recovery was complicated by severe hypovolemic shock requiring high-dose vasopressors for 7272 hours. Over the past 1212 hours, he has developed a fever and lethargy. Temperature is 39.2∘C39.2^\circ C (102.6∘F102.6^\circ F), blood pressure is 105/65105/65 mm Hg, and heart rate is 118118/min. Abdominal examination reveals moderate distension, and palpation of the right upper quadrant elicits localized guarding. Laboratory studies show a leukocyte count of 19,500/mm319,500/mm^3 with 14%14\% bands. Liver function tests show a mildly elevated alkaline phosphatase with normal transaminases. Bedside ultrasonography demonstrates a markedly distended gallbladder with a wall thickness of 66 mm, distinct pericholecystic fluid, and no sonographic evidence of gallstones. The common bile duct measures 44 mm in diameter. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Image-guided percutaneous cholecystostomy

Answer

The most appropriate next step in management is image-guided percutaneous cholecystostomy.
The patient has acute acalculous cholecystitis (AAC), a severe inflammation of the gallbladder that occurs in critically ill patients, typically following major surgery, trauma, or prolonged shock. The pathogenesis involves gallbladder stasis and ischemia, often exacerbated by vasopressor use and lack of enteral stimulation, leading to secondary bacterial infection. The ultrasound findings of gallbladder wall thickening, pericholecystic fluid, and absence of gallstones in a critically ill patient are highly specific for this diagnosis. Because patients with AAC are usually critically ill with high operative risk, the treatment of choice is immediate gallbladder drainage via image-guided percutaneous cholecystostomy alongside systemic antibiotics. Definitive cholecystectomy can be considered later if the patient recovers and becomes a suitable surgical candidate.

Step-by-Step Solution

1
Synthesize the clinical presentation and history
Critically ill patient on postoperative day 88 after aortic repair and prolonged shock, presenting with new fever, right upper quadrant pain, and leukocytosis.
To identify the most likely category of postoperative complication.
2
Interpret the bedside imaging and laboratory findings
Ultrasound reveals a thickened gallbladder wall and pericholecystic fluid without gallstones, alongside a normal common bile duct.
To confirm the specific diagnosis of acute acalculous cholecystitis.
3
Determine the optimal management based on patient stability
Select image-guided percutaneous cholecystostomy.
The patient is critically ill and a poor operative candidate, making minimally invasive percutaneous drainage the safest and most effective method for source control.

Key Concept

Management of acute acalculous cholecystitis in critically ill postoperative patients
Question 971Question →

During morning rounds, a 65-year-old woman is evaluated on postoperative day 4 following an elective right hemicolectomy for a large adenomatous polyp. Her medical history includes heart failure with preserved ejection fraction, type 2 diabetes mellitus, and chronic obstructive pulmonary disease (COPD). An indwelling urinary catheter, placed prior to surgery, remains in situ to monitor urine output. Today, she reports feeling feverish and having mild chills but denies cough, shortness of breath, dysuria, or calf pain. Her temperature is 38.6°C (101.5°F), blood pressure is 132/80 mmHg, pulse is 104/min, and respirations are 16/min. Pulse oximetry is 96% on room air. Cardiopulmonary examination reveals distant breath sounds and scattered end-expiratory wheezes that are unchanged from her preoperative baseline. There is no jugular venous distention or peripheral edema. The abdomen is soft and mildly tender near the surgical site. The midline abdominal incision is clean, dry, and intact without surrounding erythema or drainage. Which of the following is the most appropriate next step in management?

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Answer: Remove the urinary catheter and obtain a voided urine sample for culture

Answer

Remove the urinary catheter and obtain a voided urine sample for culture
The correct answer is to remove the urinary catheter and obtain a voided urine sample for culture. This patient is experiencing a new-onset fever on postoperative day 4. In the postoperative period, the timing of a fever provides critical clues to its etiology, often summarized by the '5 Ws': Wind (lungs, POD 1-2), Water (urinary tract, POD 3-5), Walking (venous thromboembolism, POD 4-6), Wound (surgical site, POD 5-7), and Wonder drugs (drug fever, POD 7+). A fever on POD 4 in a patient with an indwelling urinary catheter is highly suspicious for a catheter-associated urinary tract infection (CAUTI). The most appropriate initial management for suspected CAUTI is the removal of the unnecessary catheter (to eliminate the nidus of infection) and obtaining a voided midstream or clean-catch urine sample for culture before initiating targeted antibiotic therapy.

Step-by-Step Solution

1
Analyze the timing of the patient's postoperative fever.
The fever has developed on postoperative day 4.
Timing is the most critical factor in determining the likely etiology of a postoperative fever.
2
Correlate the timing with potential sources of infection (the '5 Ws').
Postoperative day 4 corresponds to 'Water', pointing to a urinary tract infection as the most likely source.
Catheter-associated urinary tract infections classically present between postoperative days 3 and 5.
3
Evaluate the physical examination findings to rule out other potential causes.
The lung exam is at baseline (ruling out pneumonia or acute heart failure exacerbation), and the incision is clean (ruling out a surgical site infection).
Confirming the absence of other focal findings strengthens the suspicion of a urinary source.
4
Determine the most appropriate management for the suspected diagnosis.
The Foley catheter should be removed and a urine culture obtained before giving any antibiotics.
Removing the nidus of infection and obtaining accurate source cultures are the foundational steps of managing a catheter-associated infection.

Key Concept

The evaluation of postoperative fever relies heavily on the timing of symptom onset (the '5 Ws'); a fever on postoperative days 3-5 in a patient with an indwelling Foley catheter should prompt immediate catheter removal and a urinalysis with culture to evaluate for a catheter-associated urinary tract infection.
Question 972Question →

A 55-year-old man is evaluated in the surgical intensive care unit on postoperative day 3 following an extensive bowel resection. He just underwent right internal jugular central venous catheter placement for the administration of total parenteral nutrition. Ten minutes after the procedure, he develops sudden, severe dyspnea and right-sided chest pain. Vital signs show a temperature of 37.1°C (98.8°F), heart rate of 132/min, blood pressure of 85/50 mmHg, and oxygen saturation of 87% on room air. Physical examination reveals absent breath sounds on the right hemithorax and distended neck veins. Arrange the following steps in the most appropriate chronological sequence for the immediate management of this patient.

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Answer

The correct sequence is to first administer 100% supplemental oxygen, followed immediately by needle thoracostomy, then insert a tube thoracostomy, and finally obtain a portable chest radiograph.
The patient's presentation of severe hypotension, tachycardia, absent breath sounds, and distended neck veins immediately following central line placement is classic for an iatrogenic tension pneumothorax. Management strictly follows trauma and resuscitation algorithms: first, secure the airway and provide 100% oxygen. Because the patient is hemodynamically unstable, the tension pneumothorax must be treated presumptively with an immediate needle thoracostomy (decompression). Once the life-threatening tension is relieved, a definitive tube thoracostomy (chest tube) is placed. Finally, a portable chest radiograph is obtained to confirm the resolution of the pneumothorax and verify proper tube placement.

Step-by-Step Solution

1
Administer oxygen and secure airway.
Improves tissue oxygenation and provides initial support.
Airway and breathing are the paramount first steps in the acute resuscitation protocol.
2
Perform immediate needle thoracostomy.
Rapidly decompresses the pleural space and restores venous return to the heart.
Hemodynamic instability (hypotension, tachycardia) and clinical signs of tension pneumothorax dictate immediate clinical intervention without waiting for radiographic confirmation.
3
Insert a tube thoracostomy.
Provides definitive, ongoing management of the pneumothorax.
Needle decompression is only a temporary, emergency bridge to definitive chest tube placement.
4
Obtain a portable chest radiograph.
Confirms correct tube positioning and adequate lung expansion.
Imaging is only safe to perform once the life-threatening intrathoracic tension has been relieved.

Key Concept

Tension pneumothorax is a clinical diagnosis requiring immediate needle decompression prior to radiographic imaging in any hemodynamically unstable patient.
Estimated Time:1m 0s
Question 973Question →

A 72-year-old man is assessed in the intensive care unit 6 hours after undergoing an open exploratory laparotomy and lysis of adhesions for a small bowel obstruction. The anesthesia records note that he received 4.5 liters of lactated Ringer solution during the operation due to transient hypotension. His past medical history includes chronic obstructive pulmonary disease, hypertension, and a myocardial infarction 3 years ago. He now complains of rapidly worsening shortness of breath. His temperature is 38.1°C (100.6°F), blood pressure is 158/94 mm Hg, pulse is 114/min, and respiratory rate is 26/min. Pulse oximetry shows 88% on room air. Physical examination demonstrates distended jugular veins. Lung auscultation reveals bibasilar crackles and diffuse expiratory wheezing. Cardiac auscultation reveals a rapid, regular rhythm with a distinct third heart sound (S3). The surgical incision is intact without erythema or drainage. Which of the following are the most appropriate next steps in the management of this patient? (Select all that apply)

Select all that apply

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Answer: Initiate intravenous diuresis with furosemide; Provide supplemental oxygen with noninvasive positive pressure ventilation

Answer

The most appropriate next steps are to initiate intravenous diuresis with furosemide and provide supplemental oxygen with noninvasive positive pressure ventilation.
The patient is experiencing acute decompensated heart failure caused by significant intraoperative fluid administration, exacerbated by his underlying cardiovascular disease. The classic signs of volume overload (distended jugular veins, S3 gallop, and pulmonary crackles) mandate immediate treatment with a loop diuretic to remove excess fluid. Concurrently, noninvasive positive pressure ventilation is highly effective in acute cardiogenic pulmonary edema to maintain airway patency, improve gas exchange, and decrease cardiac workload.

Step-by-Step Solution

1
Evaluate the vital signs and physical examination findings in the context of the recent surgery and large volume of intravenous fluids administered.
The patient is presenting with hypoxia, tachycardia, distended jugular veins, bibasilar crackles, and an S3 gallop shortly after receiving 4.5 liters of crystalloid fluid.
Identifying the primary physiological derangement causing acute postoperative dyspnea is required to direct appropriate therapy.
2
Differentiate between cardiogenic and pulmonary causes of dyspnea based on the physical examination.
The presence of distended jugular veins, crackles, and an S3 gallop strongly indicates acute decompensated heart failure due to volume overload, rather than a COPD exacerbation.
Patients with a history of COPD and cardiac disease can present with wheezing in both conditions, but systemic volume overload signs point directly to a cardiac etiology.
3
Select the appropriate acute interventions to manage the identified condition.
Loop diuretics and ventilatory support are indicated.
Diuretics reduce intravascular volume, while noninvasive positive pressure ventilation improves oxygenation and decreases both cardiac preload and afterload.

Key Concept

Acute decompensated heart failure can rapidly develop in the immediate postoperative period due to aggressive intraoperative fluid resuscitation, particularly in patients with underlying cardiovascular disease. It often presents with dyspnea, hypoxia, distended jugular veins, crackles, and an S3 gallop. The primary management includes aggressive volume reduction with loop diuretics and ventilatory support such as noninvasive positive pressure ventilation.
Estimated Time:1m 30s
Question 974Question →

A 6868-year-old man is recovering in the surgical ward on postoperative day 11 following an open abdominal aortic aneurysm repair. His preoperative hemoglobin was 11.2 g/dL11.2 \text{ g/dL}, and his postoperative hemoglobin is 7.1 g/dL7.1 \text{ g/dL}. A transfusion of packed red blood cells is initiated. Approximately 2020 minutes into the transfusion, the patient complains of sudden-onset chills, severe flank pain, and shortness of breath. His temperature is 38.9∘C38.9^\circ\text{C} (102.0∘F102.0^\circ\text{F}), blood pressure is 90/60 mm Hg90/60 \text{ mm Hg}, and heart rate is 115/min115/\text{min}. A Foley catheter drains dark, reddish-brown urine. Arrange the following management steps in the most appropriate chronological sequence for this patient's acute complication.

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Answer

The correct sequence is: 1) Stop the transfusion, 2) Initiate normal saline through new tubing, 3) Verify identification bands, 4) Send samples to the blood bank, 5) Administer aggressive intravenous hydration.
The correct chronological management prioritizes patient safety by immediately stopping the offending agent. This is immediately followed by securing IV access with entirely new tubing to prevent further exposure while allowing for fluid administration. Once the patient is stabilized, determining the cause (clerical check) and confirming the diagnosis (blood bank testing) are performed, followed by definitive complication management (aggressive hydration for renal protection).

Step-by-Step Solution

1
Stop the blood transfusion immediately and disconnect the tubing.
Further administration of incompatible red blood cells is halted.
This is the most critical first step to minimize the severity of the acute hemolytic transfusion reaction.
2
Maintain intravenous access by initiating a normal saline infusion through new tubing.
Intravenous access is secured for resuscitation without administering more incompatible blood.
Using new tubing prevents flushing the remaining incompatible blood from the old tubing into the patient.
3
Verify the patient's identification wristband against the blood product label.
A clerical error is identified or ruled out.
ABO incompatibility due to clerical error is the most common cause of acute hemolytic transfusion reactions.
4
Send the discontinued blood bag and newly drawn patient blood samples to the blood bank.
Diagnostic workup is initiated.
A direct antiglobulin test and repeat crossmatching are necessary to confirm the diagnosis and guide further transfusion needs.
5
Administer aggressive intravenous hydration to prevent acute kidney injury.
Renal perfusion is maintained and free hemoglobin is diluted.
Free hemoglobin from lysed red blood cells can precipitate in the renal tubules, causing acute tubular necrosis.

Key Concept

The management of an acute hemolytic transfusion reaction requires immediate cessation of the transfusion, maintenance of intravenous access using entirely new tubing, bedside clerical verification, laboratory confirmation, and prevention of acute kidney injury with aggressive hydration.
Estimated Time:1m 30s
Question 975Question →

An assessment is requested for a patient recovering in the surgical unit. The patient is a 58-year-old female who underwent an open abdominal hysterectomy six days ago for symptomatic uterine leiomyomas. Over the past 12 hours, she has developed new-onset chills and worsening pain at her incision site. Her medical history includes diet-controlled type 2 diabetes mellitus and heart failure with preserved ejection fraction. Current vital signs reveal a temperature of 38.9°C (102.0°F), blood pressure of 130/80 mmHg, heart rate of 96/min, and respiratory rate of 16/min. Pulse oximetry is 96% on room air. Upon physical examination, the lungs exhibit faint, scattered basilar crackles that clear completely with a cough. Abdominal examination demonstrates a 4-cm area of significant erythema, induration, and point tenderness at the inferior aspect of the midline surgical incision. Gentle palpation of this area produces a small amount of thick, purulent exudate between the surgical staples. Bowel sounds are active, and there is no rebound tenderness or guarding in the remaining abdominal quadrants. Which of the following is the most appropriate next step in management?

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Answer: Remove the staples at the affected site and pack the wound

Answer

Remove the staples at the affected site and pack the wound
This patient is presenting with classic signs of a superficial surgical site infection (SSI) on postoperative day 6. The most appropriate next step in management is to open the wound by removing the staples at the affected site and packing it with sterile gauze. This allows for mechanical drainage of the purulent material and facilitates healing by secondary intention. Source control is the cornerstone of SSI management. Systemic antibiotics are generally not required for superficial SSIs in the absence of extensive surrounding cellulitis, systemic inflammatory response syndrome (beyond a simple fever), or immunocompromise.

Step-by-Step Solution

1
Evaluate the patient's postoperative timeline and physical examination findings.
The patient is on postoperative day 6 with a new high fever and localized erythema, induration, and purulent drainage at the surgical incision site.
Identifying the specific signs of a surgical site infection (SSI) is critical for determining the source of the postoperative fever.
2
Determine the most appropriate initial management for a superficial surgical site infection.
The primary treatment is immediate source control achieved by opening the affected portion of the wound.
Superficial SSIs require mechanical drainage to remove infected fluid and promote healing by secondary intention; antibiotics or imaging cannot replace source control.

Key Concept

Management of superficial surgical site infections
Estimated Time:1m 15s
Question 976Question →

A 62-year-old man is evaluated on postoperative day 5 following an elective sigmoid colectomy with primary anastomosis for recurrent diverticulitis. He reports the acute onset of severe, localized left lower quadrant abdominal pain. His temperature is 38.8°C (101.8°F), blood pressure is 105/65 mmHg, heart rate is 112/min, and respiratory rate is 20/min. Physical examination reveals focal tenderness and guarding in the left lower quadrant, but no diffuse abdominal rigidity. Laboratory studies show a leukocyte count of 16,500/mm³ with a left shift. Arrange the following management steps in the most appropriate chronological sequence for this patient.

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Answer

The correct sequence for managing a suspected postoperative anastomotic leak with localized peritonitis is: 1) Initiate rapid fluid resuscitation, 2) Obtain cultures and administer antibiotics, 3) Perform a CT scan of the abdomen and pelvis, and 4) Proceed with definitive targeted source control.
This patient's presentation of fever, tachycardia, borderline hypotension, and focal left lower quadrant pain on postoperative day 5 is highly suspicious for an anastomotic leak or pelvic abscess. The management of localized postoperative intra-abdominal infections strictly follows the paradigm of resuscitation, medical therapy, diagnosis, and definitive source control. The absolute first priority is to support the circulation by establishing intravenous access and initiating a crystalloid fluid bolus. Once access is secured, blood cultures must be drawn prior to the administration of empiric broad-spectrum antibiotics to avoid sterilizing the sample. After the patient is hemodynamically stable and systemic infection is being medically addressed, a CT scan of the abdomen and pelvis with water-soluble contrast is performed. This imaging accurately diagnoses the source and extent of the complication (barium is avoided due to the risk of barium peritonitis if a leak is present). Finally, the imaging results guide the definitive source control, which may be minimally invasive (e.g., percutaneous drainage of a well-defined abscess) or surgical (e.g., exploratory laparotomy and proximal diversion for an uncontained leak). Patients with diffuse peritonitis or refractory shock would bypass the CT scan and proceed directly to the operating room, but this patient's focal examination allows for preoperative diagnostic imaging.

Step-by-Step Solution

1
Assess the patient's hemodynamic status and restore intravascular volume.
Prevention of cardiovascular collapse and optimization of tissue perfusion.
Tachycardia and borderline hypotension indicate early sepsis. Securing intravenous access and providing crystalloid fluids is the most critical first step.
2
Draw blood cultures followed immediately by the administration of intravenous antibiotics.
Identification of the pathogen and initiation of systemic antimicrobial control.
To prevent sterilization of the sample, cultures must be drawn first. Prompt antibiotic delivery is essential to halt the progression of sepsis.
3
Perform diagnostic imaging using a CT scan with water-soluble contrast.
Accurate localization of the infectious source (e.g., anastomotic leak vs. pelvic abscess).
Because the patient has focal left lower quadrant signs rather than a rigid abdomen with generalized peritonitis, imaging is safe (post-resuscitation) and necessary to plan the intervention.
4
Execute definitive source control via minimally invasive or open surgical techniques.
Eradication of the primary infectious focus.
Depending on whether the CT shows a well-contained abscess or an uncontained leak, the patient requires targeted percutaneous drainage or an emergent laparotomy, respectively.

Key Concept

The standard chronological management of localized postoperative intra-abdominal infection involves immediate hemodynamic resuscitation, prompt empiric antimicrobial therapy (following blood cultures), diagnostic imaging, and subsequent definitive source control.
Estimated Time:1m 30s
Question 977Question →

A 37-year-old male is brought to the emergency department by ambulance after falling approximately 20 feet (6 meters) from scaffolding. He is immobilized on a backboard with a cervical collar. Upon arrival, his temperature is 36.1∘C36.1^{\circ}\text{C} (97.0∘F97.0^{\circ}\text{F}), blood pressure is 78/45 mmHg78/45\text{ mmHg}, heart rate is 138 /min138\text{ /min}, and respiratory rate is 26 /min26\text{ /min}. Oxygen saturation is 97%97\% on room air. Two large-bore intravenous lines are established, and aggressive crystalloid fluid resuscitation is initiated. The airway is patent, and breath sounds are present and equal bilaterally. The abdomen is distended and diffusely tender. The pelvis is stable to anteroposterior compression. Focused assessment with sonography for trauma (FAST) reveals a significant anechoic fluid collection in the splenorenal recess. His blood pressure remains 80/48 mmHg80/48\text{ mmHg} after 1 L1\text{ L} of crystalloid infusion. Which of the following is the most appropriate next step in management?

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Answer: Exploratory laparotomy

Answer

Exploratory laparotomy
The correct next step is immediate exploratory laparotomy. According to advanced trauma life support (ATLS) protocols, a patient presenting with blunt abdominal trauma who exhibits hemodynamic instability (e.g., persistent hypotension and tachycardia despite initial crystalloid resuscitation) must undergo rapid evaluation for the source of bleeding. A positive Focused Assessment with Sonography for Trauma (FAST) scan confirms the presence of intraperitoneal hemorrhage. In the setting of shock and a positive FAST, the patient is actively bleeding into the abdominal cavity and requires immediate surgical exploration (laparotomy) to achieve source control. Any delay for further diagnostic testing significantly increases mortality.

Step-by-Step Solution

1
Evaluate the patient's hemodynamic status and response to initial resuscitation.
The patient presents in hypovolemic shock (hypotension, tachycardia) and remains unstable after an initial 1 L crystalloid bolus.
Hemodynamic status dictates the diagnostic and therapeutic algorithm in blunt trauma.
2
Analyze the primary survey and bedside imaging findings.
Airway and breathing are intact. The FAST scan is positive, demonstrating anechoic fluid (blood) in the splenorenal recess.
A positive FAST localizes the source of hemorrhagic shock to the peritoneal cavity.
3
Determine the definitive treatment based on the ATLS algorithm for blunt abdominal trauma.
Immediate exploratory laparotomy is required.
The combination of hemodynamic instability and a positive FAST scan indicates life-threatening intra-abdominal hemorrhage requiring emergent surgical source control.

Key Concept

In patients with blunt abdominal trauma, the combination of hemodynamic instability and a positive FAST scan is an absolute indication for immediate exploratory laparotomy.
Question 978Question →

Match the following clinical presentations of trauma patients to the most appropriate next step in management. Assume airway and breathing have been assessed and secured in all patients.

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Items

Blunt abdominal trauma; BP 75/40 mm Hg, HR 130/min; FAST exam reveals intraperitoneal free fluid
High-speed motor vehicle collision; BP 80/50 mm Hg, HR 125/min; severe pelvic pain; FAST exam is negative
Fall from 10 feet; BP 125/80 mm Hg, HR 88/min; FAST exam demonstrates fluid in the splenorenal recess
Blunt thoracic trauma; BP 130/85 mm Hg, HR 90/min; portable chest radiograph demonstrates a widened mediastinum

Matches

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Answer

Unstable + positive FAST matches to exploratory laparotomy. Unstable + pelvic fracture + negative FAST matches to pelvic binder and angiography. Stable + positive FAST matches to CT of the abdomen and pelvis. Stable + widened mediastinum matches to CT angiography of the chest.
Appropriate trauma management relies on the Advanced Trauma Life Support (ATLS) algorithms. The algorithm branches sharply based on hemodynamic stability. Unstable patients with intra-abdominal bleeding (positive FAST) must go to the operating room for an exploratory laparotomy. Unstable patients with severe pelvic fractures and a negative FAST usually bleed into the retroperitoneum, which is managed mechanically (pelvic binder) and endovascularly (angiography). Conversely, stable patients, even with abnormal preliminary findings (positive FAST or widened mediastinum), can and should undergo definitive cross-sectional imaging (CT scan) to properly grade the injury and avoid unnecessary surgery.

Step-by-Step Solution

1
Assess the hemodynamic status of each patient.
Patients 1 and 2 are in hypovolemic shock (unstable). Patients 3 and 4 have normal blood pressure and heart rate (stable).
Hemodynamic stability dictates whether a patient can safely travel to the CT scanner or requires immediate bedside/operating room intervention.
2
Evaluate the primary survey findings for the unstable patients.
Patient 1 has a positive FAST (intraperitoneal bleeding) requiring exploratory laparotomy. Patient 2 has a negative FAST but a severe pelvic fracture (retroperitoneal bleeding) requiring a pelvic binder and angiography.
The source of bleeding must be identified rapidly to direct the life-saving intervention to the correct anatomical cavity.
3
Determine the appropriate advanced imaging for the stable patients.
Patient 3 needs an abdominal CT to evaluate the intra-abdominal fluid seen on FAST. Patient 4 needs a chest CT angiography to evaluate the widened mediastinum.
Stable patients can safely undergo definitive cross-sectional imaging to guide precise nonoperative or operative management.

Key Concept

The primary determinant of the diagnostic and therapeutic algorithm in trauma is the patient's hemodynamic stability, followed by the identification of the bleeding source using adjuncts like the FAST exam.
Question 979Question →

A rapid response is called for a 7474-year-old man who develops acute shortness of breath and agitation 4848 hours after undergoing a right femoral-popliteal bypass. His past medical history is significant for type 2 diabetes mellitus, hypertension, hyperlipidemia, and a 4040-pack-year smoking history. The operative report notes a brief 1515-minute episode of hypotension that resolved with intravenous fluid administration. He currently denies any chest pain. His temperature is 37.8∘C37.8^\circ\text{C} (100.0∘F100.0^\circ\text{F}), pulse is 116116/min, blood pressure is 100/60100/60 mmHg, respirations are 2626/min, and oxygen saturation is 91%91\% on room air. Physical examination reveals jugular venous distention. Pulmonary auscultation demonstrates fine bibasilar crackles. Cardiac auscultation reveals a regular, rapid rhythm with an S4S_4 gallop. The surgical incisions are intact, and distal pulses are palpable. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Obtain an electrocardiogram and measure cardiac biomarkers

Answer

The most appropriate next step is to obtain an electrocardiogram and measure cardiac biomarkers.
This patient is presenting with acute dyspnea, tachycardia, hypoxia, and signs of left heart failure (bibasilar crackles, elevated jugular venous pressure, S4 gallop) on postoperative day 2 following high-risk vascular surgery. Given his history of diabetes mellitus and intraoperative hypotension, he is at very high risk for a perioperative myocardial infarction (PMI). PMIs frequently lack typical chest pain (silent ischemia) and instead present with secondary complications such as acute heart failure, altered mental status (agitation), or arrhythmias, typically peaking within the first 2-3 days after surgery. An electrocardiogram and cardiac biomarkers (troponins) are the most appropriate immediate steps to diagnose myocardial ischemia and guide further management.

Step-by-Step Solution

1
Analyze the patient's physical examination findings and vital signs.
The patient has hypoxia, tachycardia, jugular venous distention, bibasilar crackles, and an S4 gallop.
These findings are the classic constellation of acute decompensated left heart failure causing cardiogenic pulmonary edema.
2
Correlate the clinical presentation with the patient's surgical timeline and risk factors.
The patient is on postoperative day 2 following high-risk vascular surgery and has a history of diabetes, placing him at immense risk for a perioperative myocardial infarction (PMI).
PMIs frequently peak within the first 48-72 hours postoperatively. Diabetic and elderly patients often do not experience classic chest pain (silent ischemia), presenting instead with acute heart failure or altered mental status.
3
Determine the most appropriate immediate intervention.
An electrocardiogram and cardiac biomarkers must be ordered immediately.
Diagnostic confirmation of myocardial ischemia is required before initiating targeted treatments (such as diuresis, antiplatelets, or anticoagulation) in the setting of acute postoperative heart failure.

Key Concept

Perioperative myocardial infarction often presents silently (without chest pain) as acute decompensated heart failure, altered mental status, or hypotension within the first 2-3 days after high-risk surgery, necessitating immediate evaluation with an ECG and cardiac biomarkers.
Estimated Time:1m 15s
Question 980Question →

Identify the most appropriate next step in management for each of the following burn-related clinical scenarios.

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Items

Following rescue from a closed-space house fire, a patient presents with a severe headache and confusion. Pulse oximetry shows a normal oxygen saturation, but an arterial blood gas reveals profound metabolic acidosis.
A patient with full-thickness, circumferential burns affecting the entire right upper extremity develops severe, unrelenting pain when the fingers are passively extended. The hand appears pale and feels cool to the touch.
On hospital day 77, a patient recovering from 50%50\% total body surface area burns suddenly develops hypotension, tachycardia, and a temperature of 39.2∘C39.2^\circ\text{C}. Examination of the burn wounds shows rapid eschar separation and areas of dark focal necrosis.
A patient undergoing aggressive volume resuscitation for 60%60\% total body surface area burns develops a newly distended and tense abdomen. This is accompanied by a sudden drop in urine output and elevated peak airway pressures on the mechanical ventilator.
During the first 1212 hours of fluid resuscitation, a patient weighing 70 kg70\text{ kg} with 40%40\% total body surface area burns has a recorded urine output of 15 mL/hour15\text{ mL/hour} and a sustained heart rate of 130 beats/min130\text{ beats/min}.

Matches

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Answer

The correct pairings match carbon monoxide poisoning to 100% oxygen, circumferential extremity ischemia to escharotomy, late rapid eschar separation to IV antibiotics, the tense abdomen triad to bladder pressure measurement, and early hypovolemic oliguria to increased fluid rates.
Each clinical scenario corresponds to a unique physiological complication of severe burns, requiring highly specific diagnostic or therapeutic interventions based on ATLS and standard burn care guidelines.

Step-by-Step Solution

1
Analyze the house fire presentation.
Identify carbon monoxide poisoning despite normal SpO2.
Standard oximetry cannot detect carboxyhemoglobin, making clinical signs and acidosis the key indicators for starting 100% oxygen.
2
Evaluate the circumferential burn presentation.
Identify extremity compartment syndrome.
Pain with passive extension and cool extremities signify critical ischemia requiring escharotomy.
3
Assess the day 7 burn patient's new symptoms.
Diagnose invasive burn wound sepsis.
Rapid eschar separation and systemic instability mandate immediate empiric antibiotics.
4
Analyze the massively resuscitated patient's triad.
Suspect abdominal compartment syndrome (ACS).
A tense abdomen with pulmonary and renal compromise requires bladder pressure measurement for confirmation.
5
Calculate expected urine output for the 70 kg patient.
Determine that 15 mL/hour is inadequate.
Target output is 0.5 mL/kg/hour (35 mL/hour), so the current rate reflects hypovolemia requiring increased fluids.

Key Concept

Diagnosis and management of acute and subacute burn complications including carbon monoxide poisoning, compartment syndrome, burn wound sepsis, abdominal compartment syndrome, and hypovolemia.
Estimated Time:2m 0s
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