Examkin

Surgery

1344 questions

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Question 261Question →

A 4646-year-old woman is referred to the endocrine surgery clinic for evaluation of a neck mass discovered 33 weeks ago. She reports a 66-month history of severe fatigue, generalized weakness, and a 55 kg (1111 lb) unintended weight gain. She has not seen a physician in several years. Her medical history is notable for a complicated vaginal delivery 1515 years ago that required multiple blood transfusions and an extended intensive care unit stay. She currently takes no medications. Vital signs are blood pressure 92/5892/58 mmHg and heart rate 6262/min. Physical examination reveals a 3.53.5 cm, firm, mobile nodule in the right thyroid lobe. She is noted to have pale skin and sparse axillary and pubic hair.

Laboratory studies show:
Thyroid-stimulating hormone (TSH): 0.20.2 μ\mu U/mL (Normal: 0.50.5 - 5.05.0 μ\mu U/mL)
Free thyroxine (T4): 0.50.5 ng/dL (Normal: 0.90.9 - 1.71.7 ng/dL)

An ultrasound-guided fine-needle aspiration of the nodule reveals findings suspicious for papillary thyroid carcinoma (Bethesda Category V). The surgical team is planning to schedule a total thyroidectomy. Which of the following is the most appropriate next step in management prior to surgical intervention?

Show answer & explanation

Answer: Measurement of early morning serum cortisol

Answer

Measurement of early morning serum cortisol to evaluate for concomitant central adrenal insufficiency.
The patient's laboratory results demonstrate a low free T4 with an inappropriately low TSH, which is diagnostic of central (secondary) hypothyroidism. Combined with her history of a complicated delivery with severe hemorrhage, hypotension, and sparse body hair, this clinical picture strongly suggests Sheehan syndrome (postpartum pituitary necrosis). In panhypopituitarism, central adrenal insufficiency (decreased ACTH and cortisol) typically coexists with central hypothyroidism. A major physiological stressor like a total thyroidectomy for her newly diagnosed papillary thyroid carcinoma can precipitate a life-threatening acute adrenal crisis (severe shock and cardiovascular collapse) if cortisol is not replaced. Additionally, initiating thyroid hormone replacement (levothyroxine) accelerates hepatic cortisol metabolism and can independently trigger an adrenal crisis. Therefore, the essential next step before initiating any medical or surgical treatment is to evaluate the adrenal axis with an early morning serum cortisol level.

Step-by-Step Solution

1
Interpret the thyroid function tests.
The patient has both a low TSH and a low free T4.
This discordant pattern indicates central (secondary) hypothyroidism due to a pituitary or hypothalamic failure, rather than primary thyroid pathology.
2
Synthesize laboratory findings with the clinical history and physical exam.
History of postpartum hemorrhage requiring transfusions, coupled with fatigue, hypotension, and loss of axillary/pubic hair, strongly suggests Sheehan syndrome (postpartum pituitary necrosis).
Ischemic necrosis of the pituitary gland results in panhypopituitarism, affecting multiple hormone axes (TSH, ACTH, FSH/LH, etc.).
3
Identify the immediate life-threatening risk associated with surgery in this patient.
The patient is at extremely high risk for an acute adrenal crisis.
Panhypopituitarism implies a lack of ACTH, causing secondary adrenal insufficiency. The physiological stress of total thyroidectomy requires a robust cortisol response that this patient cannot mount.
4
Determine the necessary preoperative intervention.
Measure early morning serum cortisol (and potentially ACTH) to confirm adrenal insufficiency before giving any treatments or proceeding to surgery.
Glucocorticoids must be replaced before surgery to survive the stress response, and absolutely before initiating levothyroxine, which increases cortisol metabolism.

Key Concept

Preoperative evaluation of central hypothyroidism and the necessity of ruling out concomitant adrenal insufficiency before initiating levothyroxine or proceeding to surgery.
Question 262Question →

A 24-year-old man is brought to the emergency department 3 hours after a skateboarding accident in which he struck the right side of his head against a curb. Witnesses report he lost consciousness for approximately 1 minute at the scene, but then awoke, appeared completely normal, and walked home. Over the past hour, he has developed a severe headache, nausea, and progressive lethargy. His temperature is 37.0°C (98.6°F), blood pressure is 165/90 mm Hg, pulse is 52/min, and respirations are 12/min. Glasgow Coma Scale score is 10 (E2, V3, M5). Neurologic examination reveals a dilated and sluggishly reactive right pupil. Non-contrast CT of the head reveals a hyperdense, biconvex fluid collection between the skull and the dura mater over the right cerebral convexity. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Emergent craniotomy and hematoma evacuation

Answer

Emergent craniotomy and hematoma evacuation
The patient's clinical presentation (head trauma, lucid interval, rapid neurologic decline, Cushing reflex) and CT findings (hyperdense biconvex shape) are classic for an acute epidural hematoma. The ipsilateral dilated pupil indicates uncal herniation due to a rapidly expanding intracranial volume. The definitive and life-saving treatment for a symptomatic epidural hematoma causing mass effect is an emergent craniotomy and surgical evacuation of the blood clot.

Step-by-Step Solution

1
Analyze the clinical history and physical examination findings.
The patient experienced head trauma followed by a classic 'lucid interval' and subsequent rapid neurologic decline. Vitals show hypertension and bradycardia (Cushing reflex), and he has an ipsilateral dilated pupil.
These findings are highly suspicious for an expanding intracranial mass causing elevated intracranial pressure and uncal herniation.
2
Interpret the provided imaging results.
The non-contrast CT shows a hyperdense, biconvex (lens-shaped) collection.
This specific imaging pattern definitively diagnoses an acute epidural hematoma, typically caused by rupture of the middle meningeal artery.
3
Determine the most appropriate management for the diagnosed condition.
Immediate surgical intervention is required.
An epidural hematoma causing neurologic compromise and signs of herniation is a surgical emergency requiring emergent craniotomy for evacuation of the clot and source control of the bleeding.

Key Concept

Diagnosis and emergency management of acute epidural hematoma
Question 263Question →

A 72-year-old male is brought to the emergency department by ambulance due to sudden-onset, severe abdominal pain that radiates to his back. His past medical history is significant for hypertension, hyperlipidemia, and a known 5.5-cm abdominal aortic aneurysm. Upon arrival, he appears pale and diaphoretic. Vital signs show a temperature of 37.0°C (98.6°F), blood pressure of 75/40 mmHg, heart rate of 128/min, and respiratory rate of 22/min. Physical examination reveals an expansile, pulsatile abdominal mass. Peripheral pulses are weak but symmetric bilaterally. Two large-bore intravenous lines are placed, and fluid resuscitation is initiated. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Immediate transfer to the operating room

Answer

Immediate transfer to the operating room
The correct answer is immediate transfer to the operating room. This patient presents with the classic triad of a ruptured abdominal aortic aneurysm (AAA): acute severe abdominal or back pain, a pulsatile abdominal mass, and hypotension. Because the patient has a known history of a 5.5-cm AAA and is currently hemodynamically unstable (blood pressure 75/40 mmHg), the diagnosis is presumed to be a ruptured AAA. For hemodynamically unstable patients with a known AAA and signs of rupture, emergent surgical repair (either open exploratory laparotomy or endovascular repair, depending on institutional protocols and rapid anatomy assessment in the OR) is required immediately. Delaying surgery for any diagnostic imaging is contraindicated as it significantly increases mortality.

Step-by-Step Solution

1
Identify the patient's classic triad of symptoms.
The patient presents with severe back/abdominal pain, hypotension (75/40 mmHg), and a pulsatile abdominal mass.
Recognizing this triad in a patient with a known abdominal aortic aneurysm (AAA) establishes a clinical diagnosis of ruptured AAA.
2
Assess the patient's hemodynamic status.
The patient is hemodynamically unstable, evidenced by profound hypotension and marked tachycardia.
Hemodynamic stability dictates whether a patient can safely undergo preoperative imaging or requires immediate surgery.
3
Determine the most appropriate management.
Emergent surgical intervention (exploratory laparotomy) is required.
In the setting of presumed ruptured AAA with hemodynamic instability, any delay for diagnostic testing increases the risk of mortality.

Key Concept

Hemodynamically unstable patients with a high clinical suspicion for ruptured abdominal aortic aneurysm require immediate surgical intervention without prior imaging.
Question 264Question →

A 72-year-old man is brought to the emergency department via ambulance after a witnessed syncopal episode at his home. Upon arrival, he is awake but lethargic and complains of severe, tearing abdominal and lower back pain that began abruptly one hour ago. His medical history is significant for hypertension, hyperlipidemia, and a 5.2 cm abdominal aortic aneurysm that has been managed conservatively. His temperature is 36.8°C (98.2°F), blood pressure is 78/42 mm Hg, heart rate is 122/min, and respiratory rate is 22/min. Oxygen saturation is 95% on room air. Physical examination reveals pale, cool, and diaphoretic skin. The abdomen is distended and tender to deep palpation, with a prominent pulsatile mass palpated in the periumbilical region. Intravenous access is established and fluid resuscitation is initiated. Which of the following is the most appropriate next step in the management of this patient?

Show answer & explanation

Answer: Immediate surgical exploration

Answer

The correct answer is immediate surgical exploration.
The most appropriate next step in management is immediate surgical exploration. This patient's presentation of sudden-onset, severe tearing back and abdominal pain, a pulsatile abdominal mass, and profound hypotension constitutes the classic triad of a ruptured abdominal aortic aneurysm (AAA). Because he is hemodynamically unstable, he must be taken immediately to the operating room for emergency open or endovascular repair. Any delay for further diagnostic testing significantly increases mortality.

Step-by-Step Solution

1
Analyze the patient's vital signs and physical examination findings.
The patient has marked hypotension (78/42 mm Hg), tachycardia (122/min), and a distended abdomen with a palpable pulsatile mass.
To determine the patient's hemodynamic status and identify the likely source of shock.
2
Synthesize the clinical presentation with the patient's past medical history.
A history of a 5.2 cm abdominal aortic aneurysm combined with sudden-onset severe back pain, syncope, and hemorrhagic shock strongly suggests a ruptured AAA.
To establish a primary working diagnosis.
3
Apply the management algorithm for a suspected ruptured AAA based on hemodynamic stability.
Because the patient is hemodynamically unstable, the algorithm dictates proceeding directly to the operating room for surgical exploration rather than obtaining confirmatory imaging.
To select the most appropriate immediate life-saving intervention and avoid fatal delays.

Key Concept

Hemodynamically unstable patients presenting with signs of a ruptured abdominal aortic aneurysm (AAA) require immediate surgical exploration or endovascular repair without prior confirmatory imaging.
Question 265Question →

A 45-year-old woman is referred to the surgical clinic for evaluation of a neck mass she noticed while applying lotion. She reports a 4-kg (8.8-lb) weight loss over the past 3 months despite an increased appetite, as well as occasional palpitations. She has no personal or family history of head and neck irradiation or endocrine malignancies. Vital signs are within normal limits except for a heart rate of 102/min. Physical examination reveals a 3-cm, firm, non-tender, mobile nodule in the right thyroid lobe. Laboratory studies show:

Thyroid-stimulating hormone (TSH): 0.05 µU/mL (normal: 0.4–4.0 µU/mL)
Free thyroxine (T4): 2.4 ng/dL (normal: 0.8–1.8 ng/dL)

A dedicated neck ultrasound demonstrates a 3.2-cm solid, markedly hypoechoic nodule in the right lobe with irregular margins and internal microcalcifications. No abnormal cervical lymph nodes are identified. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Radionuclide thyroid imaging

Answer

Radionuclide thyroid imaging
The correct answer is radionuclide thyroid imaging. The initial evaluation of any thyroid nodule greater than 1 cm begins with a serum TSH level and a targeted thyroid ultrasound. When the TSH is subnormal (indicating overt or subclinical hyperthyroidism), the most appropriate next step is a radionuclide thyroid scan (using iodine-123 or technetium-99m) to determine the functional status of the nodule. If the scan demonstrates a hyperfunctioning ('hot') nodule, the risk of malignancy is extremely low, and a fine-needle aspiration (FNA) biopsy is contraindicated, regardless of how suspicious the ultrasound features appear. If the nodule is nonfunctioning ('cold'), an FNA biopsy is then indicated based on the ultrasound criteria. This question tests the physician's ability to rigidly adhere to the diagnostic algorithm despite alarming sonographic features.

Step-by-Step Solution

1
Analyze the patient's clinical and laboratory presentation.
The patient has a 3-cm palpable thyroid nodule with symptomatic thyrotoxicosis, confirmed by a suppressed TSH and elevated Free T4.
Establishing the biochemical thyroid status is the mandatory first step in evaluating any thyroid nodule >1 cm.
2
Evaluate the ultrasound findings.
The ultrasound shows high-risk features for malignancy (solid, hypoechoic, irregular margins, microcalcifications).
Ultrasound determines the size and suspicious characteristics of the nodule.
3
Apply the standard diagnostic algorithm for a thyroid nodule based on the TSH level.
Because the TSH is subnormal, the algorithm requires a radionuclide thyroid scan as the immediate next step, overriding the ultrasound features.
A radionuclide scan differentiates a hyperfunctioning ('hot') nodule from a nonfunctioning ('cold') nodule. Hyperfunctioning nodules have an extremely low risk of malignancy (<1%) and do not require fine-needle aspiration, whereas cold nodules with suspicious features must be biopsied.

Key Concept

Diagnostic workup of a thyroid nodule with a suppressed TSH requires radionuclide imaging prior to any consideration of fine-needle aspiration.
Estimated Time:1m 30s
Question 266Question →

A 72-year-old man is brought to the emergency department via ambulance due to the sudden onset of severe abdominal and back pain that started one hour ago. He also reports severe lightheadedness and nausea. His past medical history is significant for hypertension, hyperlipidemia, chronic obstructive pulmonary disease (COPD), and an open appendectomy 30 years ago. His medications include amlodipine, atorvastatin, and a tiotropium inhaler. On arrival, his temperature is 36.8°C (98.2°F), blood pressure is 74/42 mm Hg, pulse is 128/min and regular, and respirations are 28/min. Oxygen saturation is 94% on room air. Physical examination reveals a diaphoretic and pale patient in acute distress. Cardiopulmonary examination shows tachycardia with no murmurs, and scattered expiratory wheezes bilaterally. The abdomen is distended, diffusely tender to palpation, and a prominent pulsatile mass is appreciated in the epigastrium. Bowel sounds are hypoactive. Which of the following is the most appropriate next step in the management of this patient?

Show answer & explanation

Answer: Emergent transfer to the operating room for laparotomy

Answer

Emergent transfer to the operating room for laparotomy
The patient presents with the classic triad of a ruptured abdominal aortic aneurysm (AAA): sudden, severe abdominal and back pain, hypotension, and a pulsatile abdominal mass. In a hemodynamically unstable patient with high clinical suspicion for a ruptured AAA, the definitive treatment is immediate hemorrhage control. This requires emergent transfer to the operating room for surgical repair (either open exploratory laparotomy or endovascular aneurysm repair, depending on institutional capabilities and patient anatomy). Attempting to obtain further cross-sectional imaging prior to surgery in an unstable patient is contraindicated due to the high risk of fatal exsanguination during the delay.

Step-by-Step Solution

1
Analyze the patient's hemodynamic status.
The patient is in profound shock, as evidenced by a blood pressure of 74/42 mm Hg, tachycardia (128/min), diaphoresis, and altered peripheral perfusion.
Determining hemodynamic stability is the critical first triage step in any acute emergency, dictating whether imaging can be safely performed or immediate intervention is necessary.
2
Identify the primary source of the pathology based on physical examination findings.
The presence of a prominent, pulsatile epigastric mass in the setting of sudden-onset severe back and abdominal pain points directly to a ruptured abdominal aortic aneurysm (AAA).
The classic triad of a ruptured AAA consists of acute abdominal or back pain, hypotension, and a pulsatile abdominal mass.
3
Determine the appropriate management for an unstable patient with a suspected ruptured AAA.
Immediate surgical intervention (open laparotomy or endovascular repair) without prior cross-sectional imaging.
In hemodynamically unstable patients with a known or highly suspected ruptured AAA, any delay in hemorrhage control (such as transporting the patient to the CT scanner) significantly increases the risk of exsanguination and mortality.

Key Concept

Management of Hemodynamically Unstable Ruptured Abdominal Aortic Aneurysm
Question 267Question →

A 54-year-old man presents to the emergency department with a 12-hour history of severe, cramping abdominal pain and frequent vomiting. He has not had a bowel movement or passed flatus since the onset of his symptoms. His surgical history includes an open cholecystectomy performed 15 years ago. Vital signs show a temperature of 37.2°C (99.0°F), pulse of 98/min, respirations of 18/min, and blood pressure of 130/80 mm Hg. On physical examination, the abdomen is moderately distended and tympanic to percussion. Auscultation reveals high-pitched, hyperactive bowel sounds. There is moderate diffuse tenderness on palpation, but no guarding, rigidity, or rebound tenderness is appreciated. Laboratory investigations show a leukocyte count of 9,500/mm³ and a serum lactate level of 1.2 mmol/L. Cross-sectional imaging of the abdomen with intravenous contrast demonstrates multiple dilated small bowel loops measuring up to 4.5 cm in diameter. Furthermore, a cluster of U-shaped, fluid-filled bowel loops is identified in the mid-abdomen, with the associated mesenteric vessels radially converging toward a central focal point. The bowel wall enhancement is uniformly preserved, and there is no evidence of pneumatosis intestinalis or free intraperitoneal air. Which of the following is the most appropriate next step in the management of this patient?

Show answer & explanation

Answer: Urgent operative intervention

Answer

Urgent operative intervention
Urgent operative intervention is the correct next step because this patient's imaging demonstrates a closed-loop small bowel obstruction. Although his vital signs, physical examination, and laboratory values do not yet show overt signs of ischemia or peritonitis, a closed-loop obstruction (indicated by the U-shaped bowel loops and radially converging mesenteric vessels, known as the whirl sign) carries an exceptionally high risk of rapid progression to bowel strangulation, ischemia, and perforation. Therefore, it requires immediate surgical exploration regardless of the currently reassuring clinical parameters.

Step-by-Step Solution

1
Identify the clinical presentation
The patient has signs and symptoms of a mechanical small bowel obstruction (SBO), including colicky pain, vomiting, obstipation, and a history of prior abdominal surgery.
Establishing the primary clinical syndrome narrows the differential diagnosis to bowel obstruction.
2
Evaluate the clinical and laboratory severity markers
The patient lacks signs of systemic toxicity (normal vitals) and bowel ischemia (normal lactate, absence of peritonitis).
Typically, the absence of peritonitis or elevated lactate allows for a trial of conservative management in SBO. However, imaging must be reviewed to confirm it is uncomplicated.
3
Interpret the specific imaging findings
The CT scan reveals U-shaped bowel loops and radially converging mesenteric vessels (the 'whirl sign').
These findings are pathognomonic for a closed-loop obstruction, a specific type of mechanical obstruction where a segment of bowel is occluded at two points.
4
Determine the appropriate management algorithm
A closed-loop obstruction mandates immediate surgical exploration.
Despite reassuring clinical parameters and preserved wall enhancement, closed-loop obstructions have an exceptionally high risk of rapid progression to strangulation, ischemia, and perforation, making conservative management contraindicated.

Key Concept

Radiographic diagnosis of closed-loop small bowel obstruction and its indication for immediate surgery.
Estimated Time:1m 30s
Question 268Question →

A 72-year-old man is evaluated on postoperative day 2 following a transurethral resection of the prostate (TURP) for severe benign prostatic hyperplasia. Continuous bladder irrigation was discontinued 4 hours ago, but his indwelling 3-way urethral catheter was left in place. The patient now complains of sudden-onset, severe lower abdominal pain and an intense, constant urge to void. He appears diaphoretic and uncomfortable. His temperature is 37.1°C (98.8°F), blood pressure is 158/92 mm Hg, pulse is 118/min, and respirations are 18/min. Physical examination reveals a distended, exquisitely tender suprapubic region. The nursing staff reports that no urine has drained into the collection bag over the last 2 hours. Bedside ultrasonography demonstrates a bladder volume of approximately 850 mL with dependent, heterogeneous echogenic material. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Manual bladder irrigation with normal saline using a large-bore syringe

Answer

Manual bladder irrigation with normal saline using a large-bore syringe
This patient has developed acute clot retention, a well-recognized and common complication following transurethral resection of the prostate (TURP). The cessation of continuous bladder irrigation allows residual bleeding to form organized clots, which can physically obstruct the lumen of the indwelling urethral catheter. This leads to acute urinary retention, manifesting as severe suprapubic pain, absent urine output in the collection bag, and sympathetic hyperactivity (tachycardia, diaphoresis, and hypertension). The heterogeneous echogenic material seen on bedside ultrasound represents blood clots. The most appropriate initial step is bedside manual bladder irrigation using a large-bore syringe (such as a Toomey syringe) and sterile normal saline. This forceful flushing and aspiration breaks up and evacuates the clots, restoring catheter patency and rapidly decompressing the bladder. If manual irrigation fails to clear the clots, the next step would be returning to the operating room for cystoscopic clot evacuation.

Step-by-Step Solution

1
Analyze the patient's postoperative timeline and symptoms
The patient is post-TURP with recent cessation of continuous bladder irrigation, presenting with severe suprapubic pain, tachycardia, and absent urine output.
Identifying the clinical context points heavily toward a catheter-related complication rather than a new systemic illness.
2
Interpret the objective findings and bedside imaging
A distended, tender bladder with 850 mL volume and 'heterogeneous echogenic material' on ultrasound confirms acute urinary retention due to blood clots.
Echogenic material in the bladder following a prostate resection represents organizing hematoma/clots that physically obstruct the catheter lumen.
3
Determine the most appropriate immediate intervention
The mechanical obstruction must be cleared manually using a large-bore syringe (e.g., Toomey syringe) and sterile normal saline to flush and aspirate the clots.
Relieving the obstruction decompresses the bladder, immediately resolving the severe pain and sympathetic response (tachycardia/hypertension) without the need for unnecessary imaging or surgery.

Key Concept

Management of Postoperative Clot Retention
Question 269Question →

A 74-year-old man is evaluated in the surgical intensive care unit on postoperative day 2 following an open repair of an infrarenal abdominal aortic aneurysm. During the surgery, the inferior mesenteric artery was noted to be patent but was ligated to facilitate placement of the synthetic aortic graft. The patient's past medical history is significant for hypertension, hyperlipidemia, and coronary artery disease. Two hours ago, he began complaining of severe, escalating left lower quadrant abdominal pain. Over the last 30 minutes, he has become increasingly lethargic and less responsive. Current vital signs show a temperature of 38.9∘C38.9^\circ\text{C} (102.0∘F102.0^\circ\text{F}), blood pressure of 76/40 mmHg76/40 \text{ mmHg}, heart rate of 134/min134/\text{min}, and respiratory rate of 24/min24/\text{min}. Physical examination reveals a tensely distended abdomen with diffuse guarding, severe rebound tenderness, and absent bowel sounds. Laboratory studies show:

Leukocyte count: 24,000/mm324,000/\text{mm}^3
Serum lactate: 9.4 mmol/L9.4 \text{ mmol/L} (normal: 0.5−2.2 mmol/L0.5-2.2 \text{ mmol/L})
Arterial blood gas:
pHpH: 7.127.12
pCO2pCO_2: 30 mmHg30 \text{ mmHg}
pO2pO_2: 88 mmHg88 \text{ mmHg}

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

Show answer & explanation

Answer: Emergent exploratory laparotomy

Answer

Emergent exploratory laparotomy
The correct answer is emergent exploratory laparotomy. This patient is presenting with acute transmural colonic infarction resulting in peritonitis and septic shock. During an open abdominal aortic aneurysm (AAA) repair, the inferior mesenteric artery (IMA) is often ligated. If collateral blood flow from the superior mesenteric artery is insufficient, ischemic colitis occurs. While mild ischemic colitis involves only the mucosa and presents with self-limiting abdominal pain and bloody diarrhea, transmural infarction presents with peritoneal signs (guarding, severe rebound tenderness), profound lactic acidosis, and hemodynamic instability. In a patient with definitive peritonitis and shock, immediate surgical exploration to resect the necrotic bowel is life-saving. Any diagnostic delay for imaging or endoscopy is strictly contraindicated.

Step-by-Step Solution

1
Identify the risk factor for ischemia based on the surgical history.
The patient underwent an open abdominal aortic aneurysm (AAA) repair with ligation of a patent inferior mesenteric artery (IMA).
Ligation of the IMA predisposes the patient to colonic ischemia if collateral circulation via the marginal artery of Drummond or the arc of Riolan is inadequate.
2
Analyze the acute clinical presentation and physical examination.
The patient developed severe left lower quadrant pain progressing to a rigid abdomen with rebound tenderness, fever, and leukocytosis.
These are classic peritoneal signs indicating that the colonic ischemia has progressed to transmural bowel infarction and likely perforation.
3
Assess the patient's hemodynamic status and laboratory values.
The patient is in profound shock (blood pressure 76/40 mmHg76/40 \text{ mmHg}, heart rate 134/min134/\text{min}, profound lactic acidosis with lactate 9.4 mmol/L9.4 \text{ mmol/L}).
Transmural infarction leads to massive fluid shifts, bacterial translocation, and overwhelming septic shock.
4
Determine the definitive next step in management based on stability and abdominal exam.
Immediate exploratory laparotomy is required.
Hemodynamically unstable patients with an acute surgical abdomen (peritonitis) require emergent operative intervention for source control; diagnostic imaging or endoscopic delays are strictly contraindicated.

Key Concept

Patients with acute transmural colonic infarction presenting with peritonitis and hemodynamic instability require emergent exploratory laparotomy.
Question 270Question →

Match each clinical presentation of an endocrine lesion with its most appropriate diagnostic or surgical management step.

Click a left item, then click its matching right item

Items

A 45-year-old woman with a 2-cm thyroid nodule, decreased TSH, elevated free T4, and increased uptake on a radionuclide scan.
A 55-year-old man with a 1.5-cm thyroid nodule, normal TSH, and fine-needle aspiration demonstrating intranuclear inclusions and grooved nuclei.
A 60-year-old woman with asymptomatic hypercalcemia of 11.2 mg/dL, elevated intact parathyroid hormone, and a 24-hour urine calcium of 350 mg.
A 40-year-old man with an incidentally discovered 5-cm adrenal mass and significantly elevated 24-hour urine fractionated metanephrines.

Matches

Show answer & explanation

Answer

The correct matches align each specific endocrine pathology (toxic adenoma, papillary thyroid carcinoma, primary hyperparathyroidism, and pheochromocytoma) with its standard diagnostic and perioperative surgical management.
Each matching pair appropriately links the clinical endocrine pathology with the standard of care. Toxic adenomas do not require FNA and are managed definitively. Papillary thyroid carcinomas require surgical excision. Primary hyperparathyroidism is treated with parathyroidectomy after localization. Pheochromocytomas require mandatory alpha-blockade to prevent life-threatening intraoperative hemodynamic instability.

Step-by-Step Solution

1
Evaluate the patient with a low TSH, high T4, and a 'hot' nodule on radionuclide scan.
Identify the lesion as a toxic adenoma.
Hyperfunctioning nodules have a very low risk of malignancy, so fine-needle aspiration is bypassed in favor of definitive therapy (surgery or radioactive iodine).
2
Analyze the cytology findings of intranuclear inclusions and grooved nuclei in a euthyroid patient with a nodule.
Diagnose papillary thyroid carcinoma.
These are classic histologic features requiring surgical resection via lobectomy or total thyroidectomy.
3
Interpret the laboratory panel showing hypercalcemia, elevated PTH, and high 24-hour urine calcium.
Confirm the diagnosis of primary hyperparathyroidism.
Elevated urine calcium distinguishes this from familial hypocalciuric hypercalcemia, indicating that surgical removal of the hyperfunctioning gland is appropriate.
4
Assess the adrenal mass presenting with elevated fractionated metanephrines.
Identify the tumor as a pheochromocytoma.
Medical preparation with alpha-blockade (e.g., phenoxybenzamine) is mandatory prior to surgical resection to control blood pressure during tumor manipulation.

Key Concept

Diagnostic workup and perioperative surgical management of thyroid, parathyroid, and adrenal lesions.
Question 271Question →

A 62-year-old woman is evaluated in the endocrine surgery clinic for a 3.5 cm3.5\text{ cm} right-sided thyroid nodule that she noticed while swallowing. She reports mild localized discomfort but no voice changes. She also notes a 6-month history of profound fatigue, intermittent dizziness upon standing, and decreased appetite. Her medical history is unremarkable, and she takes no medications.

Physical examination reveals a firm, mobile, non-tender nodule in the right thyroid lobe. Her blood pressure is 92/58 mmHg92/58\text{ mmHg} while supine and 80/50 mmHg80/50\text{ mmHg} upon standing. Her heart rate is 82/min82/\text{min}.

Neck ultrasound demonstrates a solid, hypoechoic 3.5 cm3.5\text{ cm} nodule with microcalcifications in the right lobe. Fine-needle aspiration biopsy reveals a follicular neoplasm (Bethesda category IV), and a diagnostic right thyroid lobectomy is planned.

Preoperative laboratory studies show:
Laboratory TestResultReference Range
Hemoglobin11.2 g/dL11.2\text{ g/dL}12.0−16.0 g/dL12.0-16.0\text{ g/dL}
Sodium133 mEq/L133\text{ mEq/L}136−145 mEq/L136-145\text{ mEq/L}
Potassium4.1 mEq/L4.1\text{ mEq/L}3.5−5.0 mEq/L3.5-5.0\text{ mEq/L}
Thyroid-stimulating hormone (TSH)0.1 \muU/mL0.1\text{ \mu U/mL}0.4−4.0 \muU/mL0.4-4.0\text{ \mu U/mL}
Free thyroxine (T4)0.5 ng/dL0.5\text{ ng/dL}0.9−1.7 ng/dL0.9-1.7\text{ ng/dL}

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

Show answer & explanation

Answer: Assessment of morning serum cortisol and adrenocorticotropic hormone (ACTH) levels

Answer

Assessment of morning serum cortisol and adrenocorticotropic hormone (ACTH) levels
This patient's laboratory results (low free T4 and inappropriately low TSH) are diagnostic of central (secondary) hypothyroidism. The presence of central hypothyroidism raises a strong suspicion for panhypopituitarism (e.g., due to a nonfunctioning pituitary macroadenoma). Her clinical signs of orthostatic hypotension, profound fatigue, and mild hyponatremia are highly consistent with concurrent central adrenal insufficiency (decreased ACTH and cortisol). Surgery represents a major physiologic stress that requires an intact adrenal response. If a patient with untreated adrenal insufficiency undergoes surgery, they are at extreme risk of developing a life-threatening acute adrenal crisis (refractory hypotension, shock). Therefore, the most critical next step is to evaluate the pituitary-adrenal axis by measuring morning serum cortisol and ACTH levels. If adrenal insufficiency is confirmed, glucocorticoid replacement must be initiated before surgery and before starting levothyroxine. (Levothyroxine increases the metabolic clearance of cortisol and can precipitate an adrenal crisis if given alone).

Step-by-Step Solution

1
Analyze the preoperative laboratory results.
The patient has both an inappropriately low TSH and a low free T4.
To determine the patient's baseline thyroid function before surgery.
2
Identify the etiology of the thyroid function abnormalities.
The combination of low TSH and low free T4 indicates central (secondary) hypothyroidism.
A low free T4 with a low or normal TSH localizes the endocrine defect to the pituitary gland or hypothalamus.
3
Correlate the pituitary dysfunction with the clinical presentation.
The patient's orthostatic hypotension, fatigue, and hyponatremia suggest concurrent central adrenal insufficiency.
Pituitary adenomas or other central lesions often cause multiple anterior pituitary hormone deficiencies (panhypopituitarism).
4
Determine the perioperative risk and select the next best step.
The pituitary-adrenal axis must be evaluated with morning cortisol and ACTH before surgery or levothyroxine administration.
Operating on a patient with undiagnosed adrenal insufficiency can precipitate a fatal adrenal crisis. Similarly, levothyroxine increases cortisol clearance, which can also trigger a crisis.

Key Concept

Patients diagnosed with central hypothyroidism must be evaluated for concurrent central adrenal insufficiency before undergoing surgery or initiating levothyroxine therapy to prevent an acute adrenal crisis.
Estimated Time:1m 30s
Question 272Question →

Match each patient's clinical presentation to the most appropriate initial diagnostic step or definitive procedural intervention.

Click a left item, then click its matching right item

Items

32-year-old man with a firm, painless testicular nodule and retroperitoneal lymphadenopathy on imaging
41-year-old man with a pelvic fracture, inability to void, and blood at the urethral meatus following a high-speed collision
68-year-old man with painless gross hematuria and a 2-cm exophytic mucosal bladder lesion seen on office cystoscopy
27-year-old pregnant patient at 24 weeks gestation with acute pyelonephritis secondary to an obstructing 8-mm ureteral calculus

Matches

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Answer

The painless testicular mass pairs with radical inguinal orchiectomy. The pelvic fracture with urethral blood pairs with retrograde urethrography. The exophytic bladder lesion pairs with TURBT. The pregnant patient with infected obstructing stone pairs with ureteral stent placement.
Each right-side item represents the definitive standard of care for the corresponding left-side presentation. Urethral injury requires retrograde urethrography, testicular cancer requires inguinal orchiectomy, bladder tumors require TURBT, and infected obstructing stones require urgent stent placement or nephrostomy.

Step-by-Step Solution

1
Analyze each clinical presentation to identify the underlying urologic pathology.
Identified suspected testicular cancer, posterior urethral injury, bladder cancer, and complicated nephrolithiasis in pregnancy.
Accurate recognition of the clinical syndrome is prerequisite to determining the correct standard of care intervention.
2
Select the definitive diagnostic test or surgical management for each identified condition.
Matched each condition to its respective gold-standard urologic procedure.
USMLE guidelines emphasize knowing the absolute contraindications (e.g., blind catheterization in urethral injury) and emergent indications (e.g., immediate decompression of an infected obstructed kidney).

Key Concept

Diagnosis and procedural management of core urologic emergencies and genitourinary malignancies.
Question 273Question →

Match each clinical presentation to its most appropriate definitive surgical procedure.

Click a left item, then click its matching right item

Items

A 68-year-old man with benign prostatic hyperplasia, suffering from recurrent acute urinary retention despite maximal medical therapy.
A 14-year-old boy presenting with sudden, severe unilateral scrotal pain and an absent cremasteric reflex, highly suspicious for testicular torsion.
A 62-year-old man diagnosed with localized, muscle-invasive urothelial carcinoma of the bladder.
A 28-year-old man with a newly identified, firm, solid testicular mass and elevated serum tumor markers.

Matches

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Answer

BPH refractory to medical therapy is treated with TURP. Testicular torsion requires immediate surgical exploration and bilateral orchiopexy. Muscle-invasive bladder cancer is treated with radical cystectomy and urinary diversion. A solid testicular mass requires a radical inguinal orchiectomy.
Each clinical scenario requires a highly specific, standard-of-care surgical intervention. BPH refractory to medical therapy necessitates procedures like TURP. Testicular torsion is a surgical emergency requiring exploration and bilateral orchiopexy. Muscle-invasive bladder cancer requires radical cystectomy. Finally, a suspicious testicular mass is managed with a radical inguinal orchiectomy to prevent tumor seeding.

Step-by-Step Solution

1
Analyze each clinical presentation to determine the underlying urologic diagnosis.
The diagnoses are: medically refractory BPH, testicular torsion, muscle-invasive bladder cancer, and suspected testicular cancer.
Accurate diagnosis is required to select the correct definitive surgical management.
2
Select the standard-of-care surgical procedure for each diagnosis.
BPH is matched to TURP; Torsion is matched to Exploration & Orchiopexy; Bladder Cancer is matched to Radical Cystectomy; Testicular Mass is matched to Radical Inguinal Orchiectomy.
These represent the fundamental surgical treatments for these core urologic conditions.

Key Concept

Indications for core urologic surgical procedures
Question 274Question →

Match the following common breast pathologies with their classic clinical presentations.

Click a left item, then click its matching right item

Items

Fibroadenoma
Fibrocystic changes
Intraductal papilloma
Inflammatory breast cancer

Matches

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Answer

Fibroadenoma pairs with the painless, mobile mass in a young woman. Fibrocystic changes pair with cyclic, bilateral tender masses. Intraductal papilloma pairs with unilateral bloody nipple discharge. Inflammatory breast cancer pairs with rapid erythema and peau d'orange.
Proper diagnosis of breast complaints relies on the direct pattern recognition of key clinical features. Age, pain, mobility, relationship to the menstrual cycle, and overlying skin changes are critical distinguishing factors between common benign entities (like fibroadenomas and fibrocystic changes) and specific malignancies (like inflammatory breast cancer).

Step-by-Step Solution

1
Identify the characteristic presentation of a fibroadenoma.
It matches the painless, firm, mobile mass in a woman under 30.
Fibroadenomas are the most common benign breast tumors in this age group, known for their distinct mobility on physical exam.
2
Identify the characteristic presentation of fibrocystic changes.
It matches the bilateral, tender masses that fluctuate with the menstrual cycle.
These benign breast changes are hormonally driven, causing cyclical pain and nodularity in the breast tissue.
3
Identify the characteristic presentation of an intraductal papilloma.
It matches the unilateral bloody nipple discharge without a palpable mass.
A benign papilloma located within a lactiferous duct is prone to bleeding, causing the distinct unilateral discharge.
4
Identify the characteristic presentation of inflammatory breast cancer.
It matches the rapidly progressive erythema, swelling, and peau d'orange.
Dermal lymphatic invasion by tumor cells causes marked edema of the skin, resulting in the classic 'orange peel' appearance and rapid onset of symptoms.

Key Concept

Clinical presentation of benign and malignant breast pathologies
Question 275Question →

Match the following types of intracranial hemorrhage with their classic presentation on a noncontrast head computed tomography (CT) scan.

Click a left item, then click its matching right item

Items

Epidural hematoma
Subdural hematoma
Subarachnoid hemorrhage
Intraparenchymal hemorrhage

Matches

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Answer

Epidural hematoma matches with the biconvex (lens-shaped) hyperdensity; Subdural hematoma matches with the crescent-shaped hyperdensity; Subarachnoid hemorrhage matches with hyperdensity in the cisterns/sulci; Intraparenchymal hemorrhage matches with localized deep hyperdensity in the basal ganglia.
Each type of intracranial hemorrhage has a distinct anatomic space that dictates its appearance on noncontrast CT. The firm attachment of the dura to the skull sutures causes arterial epidural bleeds to form a biconvex shape. Venous subdural bleeds spread over the hemisphere as a crescent. Subarachnoid blood fills the pre-existing CSF spaces (cisterns and sulci), and intraparenchymal blood pools directly within brain tissue, typically in deep structures like the basal ganglia due to hypertension.

Step-by-Step Solution

1
Evaluate the anatomy and bleeding source of an epidural hematoma.
Identify that arterial bleeding between the skull and dura creates a localized, high-pressure biconvex (lens) shape limited by cranial sutures.
This structural limitation dictates its distinct radiographic appearance on CT.
2
Evaluate the anatomy and bleeding source of a subdural hematoma.
Identify that venous bleeding between the dura and arachnoid spreads out, forming a crescent shape that can cross sutures but is stopped by dural folds.
Venous pressure is lower, allowing blood to diffuse over a larger hemispheric area.
3
Evaluate the distribution of subarachnoid hemorrhage.
Identify that blood mixes with CSF in the subarachnoid space, appearing as hyperdensity outlining the sulci and basal cisterns.
Bleeding is occurring on the surface of the brain inside the fluid-filled spaces.
4
Evaluate the location of intraparenchymal hemorrhage.
Identify that this type of bleeding occurs inside the brain parenchyma, classically in deep structures like the basal ganglia.
It is often caused by hypertensive vasculopathy affecting deep penetrating arteries.

Key Concept

Radiographic appearance and anatomic boundaries of intracranial hemorrhages
Question 276Question →

Match each of the following clinical presentations with the most appropriate definitive surgical or interventional next step in management.

Click a left item, then click its matching right item

Items

An 18-year-old male is rushed to the emergency department reporting excruciating, sudden-onset right-sided scrotal pain. Physical evaluation reveals an elevated, transversely oriented testicle with a negative cremasteric reflex. Sonography demonstrates absent testicular arterial flow.
A 45-year-old male presents in a state of shock with a blood pressure of 85/50 mmHg, rigors, and a temperature of 39.4°C (102.9°F). Non-contrast CT identifies an 8-mm calculus lodged in the left proximal ureter, causing moderate hydronephrosis.
During a routine workup for vague dyspepsia, a 60-year-old male is incidentally found to have a 3.5-cm, heavily enhancing, exophytic solid lesion isolated to the cortical surface of the right kidney.
Following an episode of painless macroscopic hematuria, a 71-year-old male undergoes a transurethral resection. Pathology confirms a high-grade urothelial malignancy penetrating into the detrusor muscle. Staging scans are entirely negative for spread.
A 29-year-old male notices a firm, non-tender nodule in his left hemiscrotum. Subsequent ultrasonography highlights a 2.8-cm solid, hypoechoic, highly vascularized mass contained within the testicular parenchyma.

Matches

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Answer

Each urologic emergency or oncology scenario must be paired with its standard-of-care surgical intervention, prioritizing organ preservation where safe, and aggressive extirpation where oncologically necessary.
The correct matches align distinct urologic pathologies with their gold-standard surgical interventions. Testicular torsion requires immediate restoration of blood flow and bilateral orchiopexy to prevent future occurrences. An infected, obstructing ureteral stone leading to sepsis is a surgical emergency demanding urgent decompression of the collecting system, rather than definitive stone fragmentation. For a small, localized renal mass, a partial nephrectomy is indicated to preserve renal function while ensuring oncologic efficacy. Muscle-invasive bladder cancer necessitates definitive extirpation via radical cystectomy and urinary diversion. Finally, a highly suspicious solid testicular mass requires a radical inguinal orchiectomy.

Step-by-Step Solution

1
Evaluate the patient with an acute scrotum lacking arterial flow.
Diagnose testicular torsion.
Requires emergent surgical unwinding and bilateral orchiopexy to prevent necrosis.
2
Analyze the case of an obstructing ureteral stone accompanied by fever and hypotension.
Identify a urologic emergency (obstructive pyelonephritis/sepsis).
Demands immediate percutaneous or internal stent decompression prior to definitive stone treatment.
3
Assess the 3.5-cm isolated, exophytic renal mass.
Diagnose a Stage T1a renal cell carcinoma.
Indicates partial nephrectomy to maximize preserved functional renal parenchyma.
4
Evaluate the pathology showing detrusor muscle invasion in bladder cancer.
Confirm muscle-invasive disease.
Requires radical cystectomy rather than repeat transurethral resection.
5
Identify the solid intratesticular mass in a young adult.
Diagnose primary testicular cancer.
Necessitates a radical inguinal orchiectomy to prevent altering lymphatic drainage.

Key Concept

Definitive surgical management of core urologic pathologies
Estimated Time:2m 0s
Question 277Question →

A 26-year-old man is brought to the emergency department after being struck by a motor vehicle. At the scene, he had a Glasgow Coma Scale score of 13, but he became progressively somnolent during transport and was intubated by emergency medical services for airway protection. On arrival, his temperature is 36.8°C (98.2°F), blood pressure is 185/105 mm Hg, and pulse is 42/min. He is mechanically ventilated. Neurologic examination reveals an unresponsive patient. The right pupil is 8 mm and non-reactive to light, while the left pupil is 3 mm and reactive. Motor examination shows decerebrate posturing on the left side in response to painful stimuli. A large, boggy swelling is noted over the right temporal region. Extended Focused Assessment with Sonography for Trauma (eFAST) is negative. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Intravenous mannitol administration

Answer

The most appropriate next step in management is intravenous mannitol administration.
The correct answer is intravenous mannitol administration. This patient presents with the Cushing reflex (hypertension and bradycardia) and signs of right-sided uncal herniation (ipsilateral fixed, dilated pupil and contralateral decerebrate posturing), likely secondary to a traumatic epidural hematoma. In a patient who is actively herniating, the immediate priority is to lower intracranial pressure to prevent irreversible brainstem damage. Medical stabilization with hyperosmolar therapy (e.g., mannitol or hypertonic saline) must be initiated immediately before transferring the patient to the CT scanner or operating room.

Step-by-Step Solution

1
Analyze the patient's vital signs and physical exam findings in the context of trauma.
The patient exhibits hypertension and bradycardia (Cushing reflex), a fixed and dilated right pupil (right CN III compression), and left-sided decerebrate posturing (right midbrain compression).
To recognize the clinical syndrome of active right-sided uncal herniation caused by a rapidly expanding intracranial mass (likely an epidural hematoma underlying the temporal swelling).
2
Determine the physiological priority in an actively herniating patient.
Immediate reduction of intracranial pressure (ICP) is required to prevent irreversible brainstem ischemia and death.
Definitive management (craniotomy) and diagnostic confirmation (CT scan) take time; the brainstem must be protected immediately during the transition of care.
3
Select the appropriate intervention to achieve the physiological priority.
Administer an intravenous hyperosmolar agent such as mannitol.
Hyperosmolar therapy creates an osmotic gradient that rapidly draws water out of the brain parenchyma, lowering ICP and bridging the patient safely to a definitive CT scan and surgical decompression.

Key Concept

Recognition and immediate medical management of acute brain herniation in traumatic brain injury.
Question 278Question →

A 24-year-old man is brought to the emergency department after being ejected from a vehicle during a high-speed collision. He is unresponsive and was intubated in the field for airway protection. Vital signs on arrival are temperature 36.1°C (97.0°F), blood pressure 72/40 mmHg, and heart rate 146/min. Physical examination reveals an obviously deformed left femur and a rigid, distended abdomen. Neurologic examination demonstrates a Glasgow Coma Scale score of 3T. His right pupil is 8 mm and nonreactive to light, while the left pupil is 3 mm and reactive. A Focused Assessment with Sonography for Trauma (FAST) exam shows massive free fluid in the hepatorenal and splenorenal recesses. The consulting neurosurgery resident recommends immediately transporting the patient to the radiology suite for a STAT non-contrast CT scan of the head, citing clinical signs of impending uncal herniation. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Immediate exploratory laparotomy

Answer

Immediate exploratory laparotomy
According to Advanced Trauma Life Support (ATLS) principles, the primary survey focuses sequentially on Airway, Breathing, Circulation, Disability, and Exposure. This patient is experiencing profound hemorrhagic shock secondary to massive intra-abdominal hemorrhage, as confirmed by the rigid abdomen and positive FAST exam. While the fixed and dilated right pupil strongly suggests an expanding intracranial hematoma and impending uncal herniation (Disability), securing Circulation (by stopping the exsanguination via immediate exploratory laparotomy) takes absolute precedence. Without adequate blood volume and systemic blood pressure, cerebral perfusion cannot be maintained, rendering any neurosurgical intervention futile. A CT scan of the head is strictly contraindicated in hemodynamically unstable trauma patients because the radiology suite is unequipped to manage imminent cardiac arrest from exsanguination.

Step-by-Step Solution

1
Assess the patient's hemodynamic status and primary survey findings.
The patient is in profound hemorrhagic shock (blood pressure 72/40 mmHg, heart rate 146/min) with a rigid abdomen and a positive FAST exam, indicating massive intra-abdominal hemorrhage.
Hemodynamic instability dictates the immediate algorithm for trauma management.
2
Evaluate the neurologic findings in the context of systemic trauma.
The patient has a fixed, dilated pupil indicating likely uncal herniation (Disability).
This identifies a secondary life-threatening injury that must be prioritized appropriately.
3
Apply ATLS prioritization principles to determine the next intervention.
Circulation (hemorrhage control via laparotomy) takes absolute precedence over Disability (intracranial pathology).
Cerebral perfusion relies entirely on systemic blood pressure; any neurosurgical intervention is futile if the patient exsanguinates.

Key Concept

In polytrauma patients, securing Circulation (ABCs) via definitive hemorrhage control takes absolute precedence over diagnostic imaging or treatment for neurosurgical emergencies, even in the presence of impending brain herniation.
Question 279Question →

A 68-year-old man is evaluated in the emergency department for severe left flank pain, high fever, and confusion. His medical history is significant for permanent atrial fibrillation, for which he takes apixaban. Two days ago, he visited an urgent care clinic for dysuria; a urine culture sent at that time is now growing *Escherichia coli* that is susceptible to ceftriaxone and resistant to ciprofloxacin.

On arrival, his temperature is 39.4∘C39.4^\circ\text{C} (102.9∘F102.9^\circ\text{F}), blood pressure is 85/50 mmHg85/50\text{ mmHg}, heart rate is 125/min125/\text{min}, and respiratory rate is 24/min24/\text{min}. Physical examination reveals exquisite left costovertebral angle tenderness.

Laboratory studies show:

TestResult
Leukocyte count22,000/mm322,000/\text{mm}^3
Hemoglobin12.8 g/dL12.8\text{ g/dL}
Platelet count210,000/mm3210,000/\text{mm}^3
Creatinine2.1 mg/dL2.1\text{ mg/dL} (baseline 1.0 mg/dL1.0\text{ mg/dL})
INR1.11.1

A bedside ultrasound demonstrates severe left hydroureteronephrosis but cannot identify the level of obstruction. The patient receives a 2-L2\text{-L} intravenous fluid bolus and is started on intravenous ceftriaxone. Thirty minutes later, his blood pressure remains 88/52 mmHg88/52\text{ mmHg} and he is increasingly lethargic. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Cystoscopy with retrograde ureteral stent placement

Answer

Cystoscopy with retrograde ureteral stent placement
This patient presents with obstructive pyelonephritis progressing to septic shock (urosepsis), which is a urologic emergency requiring immediate decompression of the infected collecting system. Bedside ultrasound confirms hydronephrosis, establishing the diagnosis. The two standard modalities for decompression are percutaneous nephrostomy (PCN) and retrograde ureteral stenting. However, this patient is actively taking apixaban, a direct oral anticoagulant. PCN requires tracting through the highly vascular renal parenchyma, which carries an unacceptably high risk of life-threatening retroperitoneal hemorrhage in a coagulopathic patient. Retrograde ureteral stenting avoids parenchymal puncture entirely and is the safest, most appropriate intervention to achieve source control.

Step-by-Step Solution

1
Assess the patient's hemodynamic status and clinical presentation.
The patient is in septic shock (hypotension refractory to fluids) secondary to an infected, obstructed kidney (fever, flank pain, hydronephrosis).
To recognize that this is a urologic emergency requiring immediate source control via decompression.
2
Evaluate the patient's medication list and coagulation status.
The patient is on apixaban, a direct oral anticoagulant (DOAC) that causes significant clinical coagulopathy despite a normal INR.
To determine the safety profile of invasive urologic procedures.
3
Select the safest method for collecting system decompression.
Retrograde ureteral stenting is chosen over percutaneous nephrostomy.
Stenting utilizes natural orifices and avoids puncturing the highly vascular renal parenchyma, minimizing the risk of catastrophic bleeding in an anticoagulated patient.

Key Concept

Emergent surgical decompression of obstructive urosepsis in patients on active anticoagulation.
Estimated Time:1m 30s
Question 280Question →

A 64-year-old man comes to the clinic complaining of a reproducible cramping pain in his right calf that occurs after walking approximately two blocks. The pain is consistently relieved by 5 minutes of rest. He has a history of type 2 diabetes mellitus, hypertension, and hyperlipidemia. He has smoked a pack of cigarettes daily for the past 35 years. His temperature is 37.0°C (98.6°F), blood pressure is 142/88 mm Hg, and pulse is 76/min. Physical examination of the lower extremities reveals diminished dorsalis pedis and posterior tibial pulses on the right side compared to the left. The skin on the right shin appears shiny and hairless. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Measurement of the ankle-brachial index

Answer

Measurement of the ankle-brachial index
The patient's presentation of reproducible calf pain relieved by rest in the setting of cardiovascular risk factors (heavy smoking, diabetes, hypertension) is classic for intermittent claudication due to peripheral arterial disease (PAD). The most appropriate initial noninvasive diagnostic test for suspected PAD is the measurement of the ankle-brachial index (ABI), which compares the systolic blood pressure measured at the ankle to the systolic blood pressure measured at the brachial artery.

Step-by-Step Solution

1
Analyze the patient's symptoms and risk factors.
The patient has exertional calf pain relieved by rest (intermittent claudication), decreased peripheral pulses, shiny skin, and multiple atherosclerotic risk factors (smoking, diabetes, hypertension).
Identifying the classic triad of symptoms and risk factors points directly to a diagnosis of peripheral arterial disease (PAD).
2
Determine the standard initial diagnostic test for this suspected condition.
The ankle-brachial index (ABI) is chosen as the first-line test.
ABI is highly sensitive, specific, inexpensive, and noninvasive, making it the ideal initial test to objectively confirm PAD before proceeding to advanced imaging or treatment.

Key Concept

The initial diagnosis of Peripheral Arterial Disease (PAD) is established using the ankle-brachial index (ABI).
Estimated Time:1m 0s
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