Examkin

All practice questions

1687 questions

All types8,270Multiple choice4,249Multiple select325Numeric160Matching1,849Ordering1,687
Question 1201Question →

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.

Drag items to arrange them in the correct order

Show answer & explanation

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 1202Question →

A 4848-year-old multiparous woman presents to the clinic complaining of heavy, irregular vaginal bleeding, foul-smelling discharge, and deep pelvic pain for the past 33 months. She has not seen a physician in over a decade. Pelvic examination reveals a 66-cm friable, exophytic mass replacing the cervix. Rectovaginal examination demonstrates nodularity and induration extending into the medial aspect of the right parametrium, but not to the pelvic sidewall. Arrange the following steps in the most appropriate sequence for the diagnosis, staging, and definitive management of this patient's condition.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The optimal sequence is: Cervical biopsy, followed by PET/CT staging, external beam radiation with concurrent chemotherapy, intracavitary brachytherapy, and finally long-term clinical surveillance.
The patient's presentation of a large cervical mass with parametrial involvement is highly suspicious for locally advanced cervical cancer (Clinical Stage IIB). The initial step is always to secure a tissue diagnosis via biopsy of the visible lesion. Once confirmed, clinical staging with advanced imaging (PET/CT) is required to evaluate nodal status and distant spread. Because the disease extends into the parametrium, primary surgery is contraindicated. Definitive management consists of concurrent chemoradiation therapy, which typically involves whole-pelvic external beam radiation paired with cisplatin, followed by localized intracavitary brachytherapy to maximize tumor destruction. Finally, patients enter a strict post-treatment clinical surveillance program.

Step-by-Step Solution

1
Diagnose via tissue biopsy
Histologically confirms invasive cervical carcinoma.
All oncologic treatment pathways require definitive tissue confirmation prior to extensive radiologic staging or intervention.
2
Stage via advanced imaging (PET/CT)
Evaluates the extent of disease, specifically focusing on pelvic and para-aortic lymph node spread and distant metastasis.
Clinical examination identified parametrial involvement (Stage IIB). Radiologic staging is necessary to define the required radiation treatment fields.
3
Treat with external beam radiation and chemotherapy (EBRT + Cisplatin)
Provides targeted regional therapy with systemic radiosensitization.
Parametrial involvement makes the patient a poor candidate for primary surgical resection (radical hysterectomy). Concurrent chemoradiation is the definitive standard of care.
4
Boost therapy with brachytherapy
Delivers a maximum, targeted radiation dose to the primary tumor bed.
Supplementing external beam radiation with intracavitary brachytherapy improves local control rates while sparing adjacent healthy pelvic organs (bladder and rectum).
5
Perform ongoing clinical surveillance
Monitors the patient for clinical remission, treatment complications, or disease recurrence.
Regular follow-up detects early signs of recurrent disease that might be amenable to targeted salvage therapies (e.g., pelvic exenteration).

Key Concept

The diagnostic and management pathway for locally advanced cervical cancer (Stage IB3 and higher) requires establishing a tissue diagnosis, radiologic staging via PET/CT, and definitive chemoradiation therapy rather than primary surgical resection.
Question 1203Question →

A 15-year-old girl is brought to the clinic by her mother for evaluation of absent menstrual periods. She has never menstruated. Physical examination reveals a height at the 5th percentile for age, Tanner stage 1 breast development, and normal-appearing female external genitalia with a patent vagina. A urine pregnancy test is negative. Arrange the following diagnostic and management actions in the most appropriate sequential order according to the standard algorithmic approach for primary amenorrhea.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: Pelvic ultrasonography, followed by Serum FSH measurement, followed by Karyotype analysis, followed by Transthoracic echocardiogram, and finally Initiation of estrogen therapy.
The standard diagnostic ladder for primary amenorrhea begins with a physical exam and ultrasound to verify the presence of a uterus. If a uterus is present but breast development is absent, the patient is hypoestrogenic, prompting FSH measurement. Elevated FSH signifies primary ovarian insufficiency. In a short-statured teenager, this is highly suspicious for Turner syndrome, prompting a karyotype. Once Turner syndrome is confirmed, cardiovascular screening (echocardiogram) is mandatory before establishing long-term care. Finally, hormone replacement (estrogen) is initiated to induce puberty and prevent osteoporosis.

Step-by-Step Solution

1
Pelvic ultrasonography
Confirms the presence of normal internal Müllerian structures.
In any patient presenting with primary amenorrhea, establishing the anatomical presence of a uterus is the foundational step before initiating biochemical workup, ruling out Müllerian agenesis or androgen insensitivity syndrome.
2
Serum FSH measurement
Differentiates central from peripheral etiology based on estrogen deficiency.
Because the patient has Tanner stage 1 breast development, she lacks endogenous estrogen. FSH distinguishes between ovarian failure (high FSH) and a hypothalamic/pituitary defect (low/normal FSH).
3
Karyotype analysis
Provides the definitive genetic diagnosis of gonadal dysgenesis.
Assuming hypergonadotropic hypogonadism (elevated FSH) given the clinical presentation of short stature, a karyotype is required to diagnose Turner syndrome (45,X) and determine if Y chromosome material is present (which would necessitate gonadectomy).
4
Transthoracic echocardiogram
Screens for critical, life-threatening congenital heart defects.
All patients newly diagnosed with Turner syndrome must undergo comprehensive cardiovascular screening, as aortic root dilation, bicuspid aortic valve, and aortic coarctation are a major source of morbidity and mortality.
5
Estrogen therapy initiation
Induces secondary sexual characteristics and protects bone health.
Once the diagnosis is secured and associated risks are evaluated, the long-term management of hypergonadotropic hypogonadism involves estrogen replacement to mimic natural puberty, followed eventually by progestin to protect the endometrium.

Key Concept

The algorithmic evaluation of primary amenorrhea requires establishing anatomy (ultrasound) followed by biochemical axis testing (FSH), and finally genetic testing (karyotype) for hypergonadotropic states prior to initiating long-term management.
Question 1204Question →

A 26-year-old man with a recent diagnosis of schizophrenia is initiated on haloperidol therapy. As his physician, you will monitor him closely for extrapyramidal symptoms (EPS). Arrange the following clinical presentations of extrapyramidal side effects in the correct chronological order based on their typical onset following the initiation of typical antipsychotic therapy, from earliest onset to latest onset.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct chronological sequence is: sustained neck contractions (acute dystonia), followed by inner restlessness (akathisia), then tremor and rigidity (parkinsonism), and finally choreoathetoid movements (tardive dyskinesia).
Extrapyramidal symptoms present in a predictable chronological sequence following the administration of dopamine D2 receptor antagonists. Acute dystonia (sustained muscle spasms) occurs earliest, within hours to days. Akathisia (inner restlessness) follows, emerging over days to weeks. Drug-induced parkinsonism (bradykinesia, rigidity, tremor) develops over weeks to months. Finally, tardive dyskinesia (involuntary choreoathetoid movements) is a late complication resulting from receptor upregulation after months to years of therapy.

Step-by-Step Solution

1
Identify the symptom that occurs most acutely (within hours to days).
Sustained, painful muscle contractions representing acute dystonia.
Acute dystonia is an immediate reaction to D2 receptor blockade in the nigrostriatal pathway.
2
Identify the symptom that emerges subacutely, typically within days to weeks.
Intense subjective inner restlessness representing akathisia.
Akathisia generally requires several days to a few weeks of antipsychotic exposure to manifest.
3
Identify the symptom that develops over weeks to months.
Resting tremor, bradykinesia, and rigidity representing drug-induced parkinsonism.
Parkinsonism takes time to develop as the dopamine-acetylcholine balance in the basal ganglia is progressively altered.
4
Identify the late-onset complication occurring after months to years.
Involuntary choreoathetoid movements representing tardive dyskinesia.
Tardive dyskinesia is caused by dopamine receptor upregulation and supersensitivity after chronic, long-term blockade.

Key Concept

The classic chronological timeline for the development of antipsychotic-induced extrapyramidal symptoms follows the sequence: Acute dystonia (hours to days), Akathisia (days to weeks), Parkinsonism (weeks to months), and Tardive dyskinesia (months to years).
Question 1205Question →

The natural history of schizophrenia typically unfolds over a patient's lifespan, reflecting its underlying neurodevelopmental pathology. Arrange the following characteristic clinical phases of the disorder in their correct chronological sequence of occurrence, from the earliest manifestation to the most advanced chronic stage.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct chronological sequence of schizophrenia progression is: Premorbid phase, Prodromal phase, Active phase, and Residual phase.
Schizophrenia follows a characteristic longitudinal trajectory. It begins with a premorbid phase of subtle developmental abnormalities, transitions into a prodromal phase of functional decline and subclinical psychotic symptoms, peaks with an active phase of florid psychosis, and eventually settles into a residual phase dominated by negative and cognitive symptoms.

Step-by-Step Solution

1
Identify the earliest developmental stage of the illness.
The premorbid phase is placed first.
Schizophrenia is a neurodevelopmental disorder that often manifests in childhood with subtle, non-specific deficits long before psychiatric symptoms emerge.
2
Identify the transitional period immediately preceding frank psychosis.
The prodromal phase is placed second.
This phase is marked by a clear decline in baseline functioning and the onset of sub-threshold (attenuated) psychotic symptoms, usually in late adolescence.
3
Identify the stage of acute clinical presentation.
The active phase is placed third.
This represents the first true psychotic break, featuring prominent hallucinations and delusions that meet full diagnostic criteria.
4
Identify the chronic, post-acute stage of the illness.
The residual phase is placed last.
Following the resolution or treatment of the florid positive symptoms, patients typically enter a prolonged period dominated by persistent negative symptoms and cognitive impairment.

Key Concept

The chronological progression and distinct clinical phases in the natural history of schizophrenia.
Question 1206Question →

A 3-year-old boy is brought to the pediatric emergency department by his parents due to a 12-hour history of high fever, extreme lethargy, and a rapidly spreading rash. The patient was previously healthy and is fully immunized. Temperature is 39.9°C (103.8°F), blood pressure is 72/40 mm Hg, pulse is 175/min, and respirations are 38/min. Pulse oximetry shows 92% on room air. On examination, the child is lethargic and minimally responsive to pain. He has cold extremities with a capillary refill time of 5 seconds. A diffuse, non-blanching purpuric and petechial rash is present over the trunk and lower extremities. The airway is patent, but he has shallow breathing. Arrange the following critical management steps in the most appropriate sequential order of priority.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequential order of priority is: 1) Administer 100% supplemental oxygen, 2) Obtain vascular access and administer isotonic fluid bolus, 3) Obtain cultures and administer antibiotics, 4) Initiate vasoactive infusion, and 5) Administer stress-dose hydrocortisone.
According to Pediatric Advanced Life Support (PALS) and Surviving Sepsis guidelines, the management of pediatric septic shock mandates a strict sequential approach following the ABCs. The first priority is to optimize oxygenation by administering 100% supplemental oxygen. The immediate next step is to establish vascular access (intravenous or intraosseous) and rapidly administer a 20 mL/kg isotonic fluid bolus to restore circulating volume. Once the initial physiological stabilization of airway and circulation is underway, blood cultures should be drawn, followed immediately by the administration of empiric broad-spectrum antibiotics (e.g., ceftriaxone and vancomycin). If the patient remains hypotensive or poorly perfused after fluid resuscitation (fluid-refractory shock), the next step is the initiation of vasoactive agents such as epinephrine. Finally, in the setting of catecholamine-resistant shock, or when adrenal hemorrhage is highly suspected (as in purpura fulminans caused by meningococcemia, known as Waterhouse-Friderichsen syndrome), stress-dose corticosteroids (hydrocortisone) should be administered.

Step-by-Step Solution

1
Assess the patient's immediate physiological status.
The patient is in uncompensated septic shock (tachycardia, delayed capillary refill, and hypotension) with hypoxemia and a purpuric rash highly suggestive of meningococcemia.
Identifying the clinical syndrome of shock and impending respiratory/cardiovascular collapse dictates the immediate prioritization of the ABC (Airway, Breathing, Circulation) resuscitation algorithm.
2
Prioritize Airway and Breathing (A and B).
Administer 100% supplemental oxygen via a non-rebreather mask.
Tissue hypoxia drives anaerobic metabolism and organ failure in shock; maximizing the fraction of inspired oxygen is the first necessary step before establishing vascular access or administering medications.
3
Prioritize Circulation (C).
Establish IV or IO access and administer a 20 mL/kg isotonic crystalloid fluid bolus.
Rapid restoration of intravascular volume to correct hypotension and improve tissue perfusion is the next most urgent intervention.
4
Address the underlying infectious etiology.
Obtain blood cultures and administer broad-spectrum antibiotics (ceftriaxone and vancomycin).
Source control via early antibiotic administration is life-saving in sepsis, but must immediately follow the mechanical stabilization of airway and circulation.
5
Manage refractory shock states.
Prepare and initiate vasoactive infusions (epinephrine), followed by stress-dose hydrocortisone if needed.
If shock persists despite adequate fluid boluses (fluid-refractory), inotropes/vasopressors are required. If it remains catecholamine-resistant, or if adrenal hemorrhage (Waterhouse-Friderichsen syndrome) is suspected, hydrocortisone is indicated.

Key Concept

Pediatric Septic Shock Management Sequence
Question 1207Question →

A 6-year-old girl is brought to the emergency department by her parents due to generalized tonic-clonic seizures that have been ongoing for 15 minutes. She recently returned from a 4-week trip visiting relatives in rural Uganda. Her parents report she has had a high fever, vomiting, and increasing lethargy over the last 3 days. She has not received any travel-related prophylaxis. On presentation, her temperature is 39.8∘C39.8^\circ\text{C} (103.6∘F103.6^\circ\text{F}), heart rate is 160/min160/\text{min}, and blood pressure is 85/50 mmHg85/50\text{ mmHg}. She is unresponsive to verbal stimuli. Point-of-care blood glucose is 45 mg/dL45\text{ mg/dL}. Arrange the following acute management steps in the most appropriate sequential order.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: 1) Administer intravenous lorazepam and a bolus of 10% dextrose, 2) Obtain thick and thin peripheral blood smears, 3) Initiate intravenous artesunate therapy, and 4) Transition to a full course of oral artemether-lumefantrine.
The patient presents with severe (cerebral) malaria complicated by status epilepticus and profound hypoglycemia. The absolute first priority in any critically ill patient is stabilization; thus, administering lorazepam to abort the seizure and dextrose to correct the hypoglycemia must occur first. Once stabilized, blood for thick and thin smears should be drawn to confirm the diagnosis and establish the baseline parasitemia before medications alter the results. Immediately following the blood draw, intravenous artesunate (the drug of choice for severe malaria) is administered. Finally, after the patient's neurological status improves and oral intake is tolerated, the patient must be transitioned to a full oral course of an artemisinin-based combination therapy to prevent recrudescence.

Step-by-Step Solution

1
Stabilize life-threatening emergencies (status epilepticus and hypoglycemia) with lorazepam and dextrose.
Cessation of seizure activity and restoration of normal blood glucose levels.
Airway, breathing, and circulation (ABCs) along with correction of critical metabolic derangements always take precedence over diagnostic testing.
2
Draw blood for thick and thin peripheral smears.
Confirmation of Plasmodium falciparum infection and calculation of the baseline parasitemia percentage.
Diagnostic sampling must be performed before the administration of antiparasitic agents to avoid clearing the organism before species identification can be completed.
3
Administer intravenous artesunate.
Rapid reduction of the Plasmodium parasite burden in the bloodstream.
Intravenous artesunate is the standard of care for severe malaria (including cerebral malaria) and significantly reduces mortality compared to older regimens.
4
Prescribe a complete course of oral artemether-lumefantrine.
Complete eradication of the parasite and prevention of disease recrudescence.
Step-down to an oral artemisinin-based combination therapy (ACT) is strictly required once the patient regains consciousness and can safely swallow.

Key Concept

The sequential management of severe pediatric malaria involves immediate hemodynamic and neurologic stabilization, followed by diagnostic smears prior to the initiation of IV artesunate, and concluding with a transition to an oral artemisinin-based combination therapy.
Question 1208Question →

A 52-year-old man with a known history of severe alcohol use disorder is brought to the emergency department by emergency medical services after being found confused and wandering in a park. On examination, he is disoriented to time and place, has horizontal nystagmus, and exhibits a wide-based, unsteady gait. He appears malnourished. Arrange the following diagnostic and therapeutic steps in the most appropriate sequential order for the acute management of this patient.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: 1) Primary assessment and capillary blood glucose measurement, 2) Intravenous thiamine administration, 3) Intravenous dextrose administration, 4) Non-contrast CT scan of the head.
The patient presents with confusion, ataxia, and nystagmus, which represents the classic clinical triad for Wernicke encephalopathy. The standard sequence of care for any patient with altered mental status begins with the primary assessment (ABCs) and a rapid capillary blood glucose check to rule out immediate life-threatening issues. Because this patient has a severe alcohol use disorder and physical signs of malnutrition and encephalopathy, high-dose intravenous thiamine must be administered next. Thiamine acts as an essential coenzyme in glucose metabolism. Therefore, thiamine must be given prior to intravenous dextrose; otherwise, the glucose load will consume the already depleted thiamine stores, worsening the encephalopathy. Finally, after the patient is metabolically stabilized and empiric therapies are administered, a non-contrast CT scan of the head is indicated to rule out occult traumatic intracranial hemorrhage, which is highly prevalent in patients with chronic alcohol use.

Step-by-Step Solution

1
Stabilize the patient and perform rapid point-of-care testing.
Airway, breathing, and circulation are secured, and capillary blood glucose is checked to evaluate for severe hypoglycemia.
ABCs and rapid identification of easily reversible, life-threatening metabolic derangements take absolute precedence in any encephalopathic patient.
2
Administer empiric intravenous thiamine.
Thiamine levels are replenished.
This patient exhibits the classic triad of Wernicke encephalopathy (confusion, ataxia, nystagmus). Thiamine is a crucial cofactor for glucose metabolism and must be given before a heavy glucose load to prevent permanent neurological damage.
3
Administer intravenous dextrose.
The patient receives necessary glucose for cellular energy.
Following thiamine administration, dextrose is provided to correct potential hypoglycemia and support overall metabolic recovery.
4
Perform appropriate neuroimaging.
A non-contrast CT scan of the head is obtained.
Patients with severe alcohol use disorder are at high risk for traumatic brain injuries due to falls. Imaging is required to rule out structural pathology, but only after the patient is metabolically stabilized.

Key Concept

In patients with severe alcohol use disorder and altered mental status, acute management requires initial ABC stabilization, followed strictly by intravenous thiamine administration prior to or concurrently with intravenous dextrose, to prevent the precipitation or exacerbation of Wernicke encephalopathy.
Question 1209Question →

A term infant is delivered vaginally. Immediately after birth, the infant is noted to be apneic and limp with a heart rate of 70/min. Arrange the following neonatal resuscitation interventions in the correct chronological sequence for this patient, assuming the infant's condition fails to improve after each consecutive step.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence follows the standard Neonatal Resuscitation Program (NRP) algorithm: Initial steps (warm/dry/stimulate) → PPV → Ventilation corrective steps → Chest compressions → Intravenous Epinephrine.
The Neonatal Resuscitation Program (NRP) follows a strict physiological algorithm based on establishing a functional airway and adequate oxygenation before initiating circulatory support. The sequence begins with initial steps (warming, positioning, clearing secretions, drying, stimulating). If the infant is apneic or the heart rate is < 100/min, positive-pressure ventilation (PPV) is initiated. If there is no improvement and no chest rise, ventilation corrective steps (MR. SOPA) must be performed. Only if the heart rate remains < 60/min despite 30 seconds of effective PPV (with chest rise) should chest compressions and 100% oxygen be initiated. Finally, if the heart rate remains < 60/min after 60 seconds of coordinated compressions and PPV, intravenous epinephrine is administered.

Step-by-Step Solution

1
Identify the initial clinical presentation
The infant is apneic, limp, and bradycardic (HR 70/min) right after delivery.
Determines the immediate need for the initial steps of neonatal resuscitation.
2
Determine the next step after initial warming and stimulation
The infant is assumed to still be apneic or have a HR < 100/min.
Guidelines mandate initiating positive-pressure ventilation (PPV) for a HR < 100/min or apnea after the initial steps.
3
Assess the response to PPV
The scenario assumes a lack of improvement; therefore, ventilation corrective steps are required.
Ensures the airway is open and ventilation is effective before escalating to chest compressions.
4
Determine criteria for chest compressions
Compressions and intubation with 100% oxygen are initiated.
Required if the heart rate drops or remains < 60/min despite adequate ventilation for at least 30 seconds.
5
Determine criteria for medication administration
Intravenous epinephrine is given.
Required if the heart rate remains < 60/min despite 60 seconds of coordinated compressions and effective ventilation.

Key Concept

Neonatal Resuscitation Program (NRP) Algorithm
Question 1210Question →

A 38-year-old man is brought to the trauma bay following a high-speed motorcycle collision. He is confused and agitated. His blood pressure is 75/40 mm Hg, and his heart rate is 142/min. His airway is patent, and breath sounds are clear and equal bilaterally. The pelvis is clinically stable on examination, and there are no obvious sources of external hemorrhage. Arrange the following steps in the most appropriate chronological sequence for the evaluation and management of this patient's condition.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is to first establish intravenous access and initiate blood transfusion, then perform a FAST examination, subsequently transport the patient to the operating room for laparotomy, perform damage control surgery with temporary closure, and finally transfer the patient to the intensive care unit.
The management of hemodynamically unstable trauma patients follows a strict algorithm. After confirming adequate Airway and Breathing, Circulation is addressed by establishing large-bore intravenous access and initiating a massive transfusion protocol. Diagnostic adjuncts, specifically the FAST examination, are then utilized to rapidly identify the source of hemorrhage. An unstable patient with a presumed intra-abdominal source requires immediate exploratory laparotomy. During the operation, damage control surgery principles dictate that temporary abdominal closure should be performed once major hemorrhage and spillage are controlled, as the patient will not tolerate a prolonged definitive reconstruction. Finally, the patient is transferred to the intensive care unit to actively correct the lethal triad (hypothermia, acidosis, and coagulopathy) before returning to the operating room for a second-look procedure.

Step-by-Step Solution

1
Address the patient's Circulation (C in the ABCDE algorithm).
Two large-bore peripheral IV lines are established, and uncrossmatched blood products are initiated.
The patient is in Class IV hemorrhagic shock and requires immediate volume resuscitation before any other diagnostic maneuvers.
2
Perform a diagnostic adjunct to identify the source of bleeding.
A Focused Assessment with Sonography for Trauma (FAST) examination is performed.
In an unstable patient with blunt trauma, FAST is a rapid, bedside modality used to detect intra-abdominal hemorrhage without delaying definitive care.
3
Proceed to definitive hemorrhage control.
The patient is transported directly to the operating room for an exploratory laparotomy.
An unstable patient with suspected intra-abdominal bleeding requires immediate surgical exploration.
4
Apply damage control surgery principles during the operation.
The surgical team performs temporary abdominal closure.
Due to severe physiologic derangement (hemorrhagic shock), prolonged definitive repair will exacerbate the lethal triad; therefore, surgery is abbreviated.
5
Restore physiologic baseline before returning for definitive repair.
The patient is transferred to the surgical intensive care unit (ICU).
The patient must be actively warmed and resuscitated to correct acidosis, hypothermia, and coagulopathy before undergoing a second-look operation.

Key Concept

The management of unstable blunt abdominal trauma relies on immediate circulatory resuscitation, rapid point-of-care ultrasound (FAST), emergent operative hemorrhage control, and damage control principles to prevent the lethal triad.
Estimated Time:2m 0s
Question 1211Question →

A 68-year-old man is evaluated on postoperative day 1 following an open partial gastrectomy for a perforated gastric ulcer. His past medical history is significant for hypertension and type 2 diabetes mellitus. The nursing staff reports that his urine output over the last 2 hours has been a total of 2525 mL. His temperature is 37.2∘C37.2^{\circ}\text{C} (99.0∘F99.0^{\circ}\text{F}), blood pressure is 105/65105/65 mmHg, pulse is 108/min108/\text{min}, and respiratory rate is 16/min16/\text{min}. The patient is currently receiving intravenous normal saline at 100100 mL/hr and has an indwelling Foley catheter in place. The abdomen is tender near the surgical incision with no rebound or guarding. Arrange the following steps in the most appropriate chronological order for the evaluation and management of this patient's postoperative oliguria.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: 1) Inspect and flush the urinary catheter, 2) Administer an intravenous fluid bolus, 3) Reassess urine output and hemodynamics, and 4) Obtain laboratory studies to assess for intrinsic renal failure.
The correct sequence prioritizes non-invasive, immediate diagnostic and therapeutic maneuvers before moving to more complex testing. In any catheterized patient with abrupt oliguria, mechanical obstruction must be excluded first by inspecting and flushing the catheter. Once patency is confirmed, the most common physiologic cause in the early postoperative setting is hypovolemia due to bleeding, sensible losses, or third-spacing. A fluid challenge with isotonic crystalloid is administered, followed by a reassessment of the clinical response. If the oliguria does not resolve with fluid administration, a laboratory evaluation (including BUN, creatinine, and urine electrolytes) is indicated to rule out intrinsic renal causes such as acute tubular necrosis.

Step-by-Step Solution

1
Rule out mechanical obstruction
Ensures the oliguria is not falsely low due to a blocked catheter.
Checking and flushing the Foley catheter is the quickest and least invasive initial step.
2
Treat presumed hypovolemia
Restores intravascular volume if the patient is dehydrated or has third-spaced fluids.
Prerenal acute kidney injury due to hypovolemia is the most common physiologic cause of early postoperative oliguria.
3
Evaluate response to therapy
Determines if the fluid bolus successfully increased urine output.
Continuous reassessment guides whether more fluid is needed or if another etiology must be considered.
4
Investigate intrinsic renal causes
Differentiates between persistent prerenal azotemia and acute tubular necrosis.
If the patient does not respond to fluid resuscitation, intrinsic kidney injury must be evaluated via serum and urine chemistries.

Key Concept

In the postoperative period, oliguria should first be evaluated for mechanical obstruction (e.g., catheter kink), followed by a fluid challenge to treat presumed hypovolemia (prerenal etiology) before initiating a workup for intrinsic renal failure.
Question 1212Question →

A term infant is delivered at 41 weeks gestation via emergent cesarean delivery for non-reassuring fetal heart tones. The delivery is complicated by thick meconium-stained amniotic fluid. Immediately after birth, the infant is limp, apneic, and has a heart rate of 80/min. Arrange the following steps of neonatal resuscitation in the correct chronological order, assuming the infant's clinical status persistently fails to improve with each preceding intervention.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence of neonatal resuscitation for a non-vigorous infant is: initial warming and stimulation, followed by positive pressure ventilation (PPV), then corrective ventilation steps if there is no improvement, followed by intubation with chest compressions if the heart rate drops below 60/min, and finally intravenous epinephrine administration.
The Neonatal Resuscitation Program (NRP) algorithm dictates a precise sequence of escalating interventions. Despite the presence of meconium-stained amniotic fluid, current guidelines state that non-vigorous infants should first receive routine initial steps: warming, drying, positioning the airway, and stimulation. Immediate intubation for tracheal suctioning is no longer recommended. Because the infant is apneic with a heart rate of 80/min (less than 100/min), positive pressure ventilation (PPV) must be initiated next. If the infant does not improve, corrective ventilation steps (such as mask adjustment or repositioning) must be performed to ensure effective ventilation with adequate chest rise. If the heart rate subsequently falls below 60/min despite 30 seconds of effective PPV, the provider must secure the airway via intubation and initiate chest compressions coordinated with ventilation. Finally, if the heart rate remains below 60/min after 60 seconds of effective chest compressions and ventilation, intravenous epinephrine is indicated, typically administered via an umbilical venous catheter.

Step-by-Step Solution

1
Assess the infant's initial presentation at birth.
The infant is term, non-vigorous (limp, apneic), and bradycardic (heart rate 80/min) in the presence of meconium-stained fluid.
Determines the starting point in the Neonatal Resuscitation Program (NRP) algorithm.
2
Identify the immediate first action for a non-vigorous infant with meconium.
The first step is to place the infant under a radiant warmer, dry, and stimulate.
Current guidelines recommend against routine immediate intubation for tracheal suctioning; initial warming and stimulation are standard for all non-vigorous deliveries.
3
Determine the next intervention based on persistent apnea and bradycardia (HR < 100/min).
Initiate positive pressure ventilation (PPV) and attach a pulse oximeter.
PPV is indicated when the infant is apneic or the heart rate is less than 100/min after initial steps.
4
Identify the action if the clinical status fails to improve after PPV initiation.
Perform corrective ventilation steps.
Effective ventilation must be established before escalating to chest compressions. Corrective steps ensure adequate chest rise.
5
Select the next step if the heart rate drops below 60/min despite effective ventilation.
Intubate the trachea and begin coordinated chest compressions.
Chest compressions are indicated only when the heart rate remains below 60/min despite at least 30 seconds of effective PPV.
6
Identify the final pharmacological step if the infant remains severely bradycardic.
Administer intravenous epinephrine via an umbilical venous catheter.
Epinephrine is indicated if the heart rate remains below 60/min after 60 seconds of coordinated chest compressions and effective ventilation.

Key Concept

Neonatal Resuscitation Program (NRP) Algorithm
Question 1213Question →

A 23-year-old man is diagnosed with schizophrenia after presenting with a 7-month history of auditory hallucinations and disorganized behavior. His physician discusses the long-term management plan, noting that many patients require medication adjustments over their lifetime to achieve and maintain symptom remission. Arrange the following pharmacological interventions in the standard step-wise treatment algorithm for schizophrenia, from initial treatment of a first episode to the management of severe, treatment-refractory disease.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is to begin with an initial second-generation antipsychotic trial, followed by a switch to a second antipsychotic if the first fails, followed by clozapine for treatment resistance, and finally clozapine augmentation if symptoms remain refractory.
The established pharmacological algorithm for schizophrenia prioritizes a balance of safety and clinical efficacy. Initial therapy involves a single second-generation antipsychotic (SGA). If this first trial fails, a second monotherapy trial with a different SGA or a first-generation antipsychotic is indicated. Only if a patient fails two adequate trials do they meet the criteria for treatment-resistant schizophrenia, for which clozapine is the gold standard intervention. Finally, if clozapine monotherapy is insufficiently effective, augmentation with ECT, a mood stabilizer, or a supplementary antipsychotic is the appropriate subsequent step.

Step-by-Step Solution

1
Identify the first-line treatment for a newly diagnosed patient.
Initiate a trial of an oral second-generation antipsychotic.
Second-generation antipsychotics are generally preferred as initial therapy due to a lower risk of extrapyramidal symptoms compared to first-generation agents.
2
Determine the next step if the first trial is unsuccessful.
Switch to a different first- or second-generation antipsychotic.
Before declaring a patient treatment-resistant, they must fail at least two different antipsychotic trials of adequate dose and duration.
3
Identify the treatment of choice for treatment-resistant schizophrenia.
Initiate clozapine monotherapy.
Clozapine is uniquely effective for treatment-resistant schizophrenia and is indicated only after two failed trials due to its risk of severe neutropenia and myocarditis.
4
Determine the management for clozapine-refractory disease.
Augment the regimen with electroconvulsive therapy (ECT) or a second antipsychotic.
When a patient fails to respond adequately to clozapine monotherapy, augmentation is the final established step in the algorithm.

Key Concept

The pharmacological algorithm for schizophrenia progresses from single antipsychotic trials to clozapine for treatment resistance (defined by the failure of 2 separate trials), followed by clozapine augmentation for refractory cases.
Question 1214Question →

A 33-year-old unimmunized boy is brought to the pediatric emergency department with a 66-hour history of high fever, severe sore throat, and progressive difficulty breathing. On presentation, he is sitting on his mother's lap, leaning forward with his neck extended. He is drooling continuously and appears highly anxious. Inspiratory stridor and moderate suprasternal retractions are visible. His temperature is 39.5∘C39.5^{\circ}\text{C} (103.1∘F103.1^{\circ}\text{F}), heart rate is 145/min145\text{/min}, and respiratory rate is 38/min38\text{/min}. Arrange the following management steps in the most appropriate sequential order for this patient.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is to first minimize agitation, then secure the airway in the operating room, followed by obtaining microbiologic cultures, and finally administering intravenous antibiotics.
This patient presents with classic signs of acute epiglottitis (tripod positioning, drooling, stridor, unimmunized status). The absolute priority is airway management. First, the child must be kept calm to prevent acute airway obstruction; any invasive procedures or oral examinations in the emergency department are strictly contraindicated. Second, the patient must be transported to the operating room for controlled endotracheal intubation by a skilled specialist. Only after the airway is safely secured (third step) should blood and epiglottic cultures be drawn, minimizing the risk of agitation-induced obstruction. Finally (fourth step), empiric intravenous antibiotics (e.g., ceftriaxone and vancomycin) are administered to treat the underlying bacterial infection.

Step-by-Step Solution

1
Prioritize airway safety by preventing sudden obstruction.
Maintain a calm environment and defer any agitating examinations or procedures.
Agitation from examinations or IV placement can lead to increased respiratory effort and sudden, fatal loss of the airway in acute epiglottitis.
2
Establish a definitive airway in a controlled setting.
Mobilize the appropriate specialists to perform endotracheal intubation in the operating room.
The swollen epiglottis requires specialized airway management; the operating room provides the safest environment.
3
Collect microbiologic samples.
Draw blood and epiglottic cultures while the patient is anesthetized.
Cultures must be obtained prior to antibiotics to ensure accurate pathogen identification, but only after the airway is secure.
4
Initiate antimicrobial therapy.
Administer empiric intravenous antibiotics.
Once cultures are drawn, broad-spectrum antibiotics should be given to treat the underlying bacterial infection.

Key Concept

The paramount priority in acute epiglottitis is avoiding patient agitation and securing the airway in a controlled environment prior to diagnostic testing or intravenous therapies.
Question 1215Question →

A 31-year-old woman presents to the clinic with a 6-month history of absent menses and new-onset, spontaneous bilateral milky nipple discharge. She has no headaches or visual changes and takes no medications. Physical examination confirms bilateral galactorrhea but is otherwise unremarkable. Visual fields are full to confrontation.

Arrange the following steps in the most appropriate chronological sequence for the evaluation and management of this patient, starting with the initial diagnostic test and progressing to the management of a refractory condition.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: 1) Perform a urine beta-human chorionic gonadotropin test, 2) Measure fasting serum prolactin and thyroid-stimulating hormone (TSH) levels, 3) Obtain magnetic resonance imaging (MRI) of the brain and pituitary sella, 4) Initiate medical therapy with a dopamine agonist, and 5) Refer the patient for transsphenoidal surgical resection.
The correct evaluation of secondary amenorrhea and galactorrhea follows a strict stepwise approach to minimize unnecessary testing and ensure patient safety. Pregnancy must always be excluded first (beta-hCG). Once excluded, biochemical testing for primary hypothyroidism and hyperprolactinemia (TSH and prolactin) is indicated. If hyperprolactinemia is confirmed and not due to hypothyroidism or medications, an MRI of the brain is obtained to identify a pituitary adenoma. The first-line treatment for a prolactinoma is a dopamine agonist (cabergoline). Transsphenoidal surgery is reserved strictly for refractory cases or when patients develop severe, progressive visual impairment despite maximal medical therapy.

Step-by-Step Solution

1
Rule out pregnancy
Perform a urine beta-hCG test
Pregnancy is the most common cause of secondary amenorrhea and can cause galactorrhea. It must be excluded before any further diagnostic testing or imaging is performed.
2
Evaluate for common endocrine etiologies
Measure TSH and prolactin levels
Primary hypothyroidism can lead to increased thyrotropin-releasing hormone (TRH), which stimulates prolactin release. Evaluating TSH and prolactin differentiates between primary hyperprolactinemia and secondary hyperprolactinemia due to hypothyroidism.
3
Localize the source of confirmed hyperprolactinemia
Obtain an MRI of the pituitary sella
Once non-pituitary causes of hyperprolactinemia are ruled out, imaging is necessary to identify potential pituitary adenomas (prolactinomas) or other sellar masses.
4
Provide first-line treatment for a prolactinoma
Initiate a dopamine agonist (e.g., cabergoline)
Unlike most other pituitary tumors, the first-line treatment for both micro- and macroprolactinomas is medical therapy with dopamine agonists, which decrease prolactin secretion and reduce tumor size.
5
Manage refractory disease
Refer for transsphenoidal surgery
Surgery is indicated only when medical therapy fails, is not tolerated, or if the patient experiences rapidly progressive visual field defects that do not respond to dopamine agonists.

Key Concept

The diagnostic and management algorithmic sequence for secondary amenorrhea with galactorrhea.
Question 1216Question →

A 42-year-old woman is evaluated in the post-anesthesia care unit 3 hours after a total thyroidectomy for a large multinodular goiter. The nurse urgently calls for evaluation because the patient is agitated and reports increasing difficulty breathing. Her blood pressure is 162/94 mm Hg, pulse is 118/min, and respirations are 28/min. Pulse oximetry shows an oxygen saturation of 88% on room air. Physical examination reveals audible inspiratory stridor. The anterior neck appears significantly swollen, tense, and ecchymotic beneath the surgical dressing. Arrange the following steps in the most appropriate chronological order for the immediate management of this patient's condition.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is to first open the cervical incision at the bedside, then manually evacuate the blood clots, followed by establishing a secure airway via endotracheal intubation, and finally transporting the patient to the operating room for definitive surgical hemostasis.
The correct sequence prioritizes immediate bedside decompression of the expanding neck hematoma. Opening the wound and evacuating the clot relieves external tracheal compression, which is absolutely necessary before attempting intubation or transferring the patient to the operating room.

Step-by-Step Solution

1
Recognize an expanding postoperative neck hematoma causing airway compromise.
Identification of a surgical emergency requiring immediate intervention.
Stridor, hypoxemia, and a tense neck mass shortly after thyroidectomy indicate life-threatening external tracheal compression.
2
Prioritize immediate bedside decompression.
The incision is opened and the hematoma is evacuated.
External compression prevents successful intubation; relieving the pressure is absolutely required to restore airway patency and allow subsequent intubation.
3
Secure the airway and transfer for definitive care.
Endotracheal intubation is performed followed by transfer to the operating room.
Definitive vascular control requires the operating room, but the patient must have a secure airway prior to any transport.

Key Concept

Management of Postoperative Neck Hematoma
Question 1217Question →

A 35-year-old male construction worker is brought to the emergency department after falling 20 feet (6 meters) from a scaffold. He is secured to a backboard with a rigid cervical collar in place. He is obtunded, opens his eyes only to painful stimuli, and makes incomprehensible sounds. Vital signs are temperature 36.5°C (97.7°F), blood pressure 75/45 mm Hg, pulse 135/min, and respirations 28/min. Pulse oximetry shows 88% on high-flow oxygen. Physical examination reveals copious blood in the oropharynx with audible gurgling. There are absent breath sounds and dullness to percussion over the right hemithorax. The abdomen is grossly distended and rigid. Arrange the following management steps in the most appropriate sequential order according to the Advanced Trauma Life Support (ATLS) protocol.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence follows the ATLS primary survey (ABCDE): Airway management (intubation), Breathing (tube thoracostomy), Circulation (blood products), Adjunct evaluation (FAST), and finally Definitive care (laparotomy).
The Advanced Trauma Life Support (ATLS) protocol mandates a strict primary survey sequence: Airway, Breathing, Circulation, Disability, and Exposure. This algorithm ensures that the most imminent threats to life are identified and treated first. In this patient, the obstructed airway (gurgling, GCS 8) must be secured first. Next, the breathing compromise from a hemothorax must be treated with a chest tube. Only then is circulation addressed with blood products. Following stabilization of the ABCs, a FAST exam is used as an adjunct to identify the source of abdominal shock, culminating in definitive surgical management via laparotomy.

Step-by-Step Solution

1
Assess and secure the airway.
The patient undergoes oropharyngeal suctioning and endotracheal intubation.
Airway compromise (gurgling, blood, GCS 8) is the most immediate threat to life and must be addressed first.
2
Assess breathing and ventilation.
A right-sided tube thoracostomy is placed.
The patient has absent breath sounds and dullness to percussion, indicating a massive hemothorax that must be drained to allow lung expansion.
3
Assess and manage circulation.
Intravenous access is obtained and uncrossmatched blood products are administered.
The patient is in hemorrhagic shock (hypotension, tachycardia) and requires immediate volume resuscitation following airway and breathing stabilization.
4
Perform diagnostic adjuncts.
A bedside FAST examination is performed.
With the ABCs addressed, an ultrasound is used to rapidly identify the source of intra-abdominal hemorrhage causing the rigid, distended abdomen.
5
Provide definitive care.
The patient is transferred to the operating room.
An unstable trauma patient with a surgical abdomen requires emergent exploratory laparotomy to definitively control the bleeding.

Key Concept

Advanced Trauma Life Support (ATLS) primary survey sequence prioritizing Airway, Breathing, and Circulation before diagnostic adjuncts and definitive surgical care.
Question 1218Question →

A 45-year-old male construction worker arrives at the emergency department triage desk complaining of an abrupt onset of excruciating epigastric pain that began 2 hours ago. The pain has now spread throughout his entire abdomen. He appears acutely ill, diaphoretic, and lies completely still on the gurney. Vital signs show a temperature of 38.2°C (100.8°F), blood pressure of 100/60 mm Hg, heart rate of 115/min, and respiratory rate of 22/min. Physical examination demonstrates a rigid, board-like abdomen with severe, diffuse rebound tenderness and involuntary guarding. Arrange the following steps in the most appropriate chronological sequence for the initial evaluation and management of this patient.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is to first establish intravenous access for fluid resuscitation, followed by performing an upright chest radiograph to confirm the diagnosis. Next, administer preoperative broad-spectrum antibiotics and proton pump inhibitors, and finally proceed with an emergency exploratory laparotomy.
The correct chronological sequence aligns with the fundamental principles of trauma and acute care surgery: first prioritize physiological stability (resuscitation), second obtain a rapid diagnosis (imaging), third provide preoperative medical optimization (antibiotics), and finally perform definitive intervention (surgery).

Step-by-Step Solution

1
Establish intravenous access and begin aggressive crystalloid fluid resuscitation.
Hemodynamic stabilization and restoration of intravascular volume.
In any acute surgical patient presenting with signs of peritonitis and tachycardia, initial management must prioritize the ABCs, specifically circulatory support with intravenous fluids to prevent cardiovascular collapse.
2
Perform an upright chest radiograph to identify subdiaphragmatic free air.
Diagnostic confirmation of a perforated viscus.
Once resuscitation is underway, a rapid diagnostic test is needed to confirm the presence of pneumoperitoneum before committing the patient to surgery.
3
Administer preoperative broad-spectrum intravenous antibiotics and proton pump inhibitors.
Medical optimization and treatment of intra-abdominal sepsis prior to surgical incision.
Following confirmation of a perforated viscus, antibiotics are required to control intra-abdominal contamination and prevent worsening sepsis, while proton pump inhibitors help reduce further gastric acid leakage.
4
Proceed with an emergency exploratory laparotomy and omental patch repair.
Definitive surgical treatment of the underlying pathology.
The ultimate treatment for a perforated peptic ulcer with generalized peritonitis is surgical exploration and repair, performed after the patient is adequately resuscitated and diagnosed.

Key Concept

Initial evaluation and sequential management of a suspected perforated viscus.
Question 1219Question →

A 68-year-old man is brought to the emergency department by his wife due to a 24-hour history of severe headache, high fever, and progressive confusion. His temperature is 39.2°C (102.6°F), blood pressure is 145/85 mmHg, heart rate is 112/min, and respiratory rate is 18/min. Neurologic examination reveals a lethargic patient who only opens his eyes to painful stimuli. He demonstrates marked nuchal rigidity and profound weakness of the right upper and lower extremities.

Arrange the following management steps in the most appropriate chronological sequence for this patient.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is to first obtain blood cultures, immediately administer empiric intravenous antibiotics and dexamethasone, then obtain a non-contrast CT scan of the head, and finally perform a lumbar puncture.
The patient presents with signs of acute bacterial meningitis. The presence of altered mental status and a focal neurologic deficit (right-sided weakness) are classic indications that a non-contrast CT scan of the head must be performed prior to a lumbar puncture to rule out a space-occupying lesion and prevent cerebral herniation. Because the CT scan will delay the lumbar puncture, empiric therapy cannot be withheld. The correct sequence is to first draw blood cultures (to maximize diagnostic yield), immediately administer empiric antibiotics and dexamethasone (to prevent mortality associated with delayed treatment), perform the CT scan, and finally perform the lumbar puncture if the CT is clear of contraindications.

Step-by-Step Solution

1
Recognize the clinical presentation and identify indications for neuroimaging prior to lumbar puncture.
The patient has signs of bacterial meningitis complicated by altered mental status and a focal neurologic deficit (right-sided weakness), necessitating a CT scan before a lumbar puncture.
Performing a lumbar puncture in the presence of a mass lesion or significantly elevated intracranial pressure can cause fatal cerebral herniation.
2
Determine the priority of interventions.
Since obtaining a CT scan will delay the lumbar puncture, empiric treatment must not be delayed.
Delays in antibiotic administration in bacterial meningitis are strongly associated with increased mortality and worse neurologic outcomes.
3
Sequence the immediate initial steps.
Blood cultures are drawn first, followed immediately by the administration of empiric antibiotics and dexamethasone.
Drawing blood cultures prior to antibiotics maximizes pathogen recovery, while immediate subsequent antibiotic administration ensures rapid, life-saving treatment.
4
Sequence the diagnostic steps.
The patient undergoes a CT scan of the head, followed by a lumbar puncture if the CT shows no contraindications.
This confirms the safety of the lumbar puncture and allows for definitive cerebrospinal fluid analysis.

Key Concept

In patients with suspected bacterial meningitis who have indications for a CT scan before a lumbar puncture (e.g., focal neurologic deficit, altered mental status, papilledema, immunocompromised state), blood cultures should be drawn first, followed immediately by empiric antibiotics and corticosteroids, before proceeding to the CT scan.
Estimated Time:1m 30s
Question 1220Question →

A multiparous patient (G3P2) at 40 weeks of gestation is in the active pushing phase of labor. Her pregnancy was complicated by gestational diabetes. Following the emergence of the fetal head, it promptly retracts against the perineal tissue (turtle sign). Standard downward traction is unsuccessful in delivering the anterior shoulder. The attending clinician immediately calls for assistance.

Arrange the following obstetric interventions in the most appropriate sequential order for managing this complication, starting from the recommended initial maneuver to the procedure of last resort.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence for managing shoulder dystocia is the McRoberts maneuver, followed by suprapubic pressure, internal maneuvers such as delivery of the posterior arm, and finally cephalic replacement (Zavanelli maneuver) if all else fails.
Shoulder dystocia is an acute obstetric emergency requiring a protocol-driven, stepwise approach. Once help is called, the first intervention is the McRoberts maneuver (hyperflexion of the maternal hips), often paired with suprapubic pressure, which collectively resolve most cases by altering the pelvic diameter and dislodging the anterior shoulder. If these external maneuvers fail, internal maneuvers such as delivering the posterior arm or performing the Woods corkscrew are attempted to manually reduce the fetal shoulder diameter. When all standard external and internal maneuvers fail, last-resort salvage procedures like the Zavanelli maneuver (replacing the fetal head into the vagina to allow for cesarean delivery) are utilized.

Step-by-Step Solution

1
Recognize the clinical signs of shoulder dystocia
The turtle sign (retraction of the fetal head) and failure of standard downward traction indicate the diagnosis.
Prompt recognition is essential to rapidly initiate the emergency algorithm and minimize the risk of fetal hypoxic injury.
2
Initiate first-line external maneuvers
Perform the McRoberts maneuver and apply suprapubic pressure.
These techniques are non-invasive, quick to execute, and resolve the vast majority of shoulder dystocia cases.
3
Proceed to internal maneuvers if external techniques are unsuccessful
Attempt to deliver the posterior fetal arm or perform rotational maneuvers.
Internal maneuvers actively reduce the fetal bisacromial diameter and physically alter the position of the impacted shoulders.
4
Execute salvage procedures as a last resort
Perform cephalic replacement (Zavanelli maneuver) followed by an emergency cesarean delivery.
This intervention carries significant maternal and fetal morbidity and is strictly reserved for refractory cases.

Key Concept

The stepwise management of shoulder dystocia prioritizes non-invasive external maneuvers (McRoberts, suprapubic pressure) before progressing to internal maneuvers (delivery of posterior arm) and finally extreme salvage procedures (Zavanelli maneuver).
Estimated Time:1m 30s
PreviousPage 61 / 85Next
All practice questions — USMLE Step 2 CK | Examkin