An urgent urology consultation is requested for a 55-year-old female admitted to the inten… — USMLE Step 3

An urgent urology consultation is requested for a 55-year-old female admitted to the intensive care unit with worsening distributive shock. She initially sought care at an outpatient clinic three days prior for left-sided back pain and dysuria, where she was prescribed oral nitrofurantoin. Her clinical status has deteriorated significantly over the past 12 hours.

Current vital signs reveal a temperature of $39.6^\circ\text{C}$ ( $103.3^\circ\text{F}$ ), heart rate of $128\text{/min}$ , blood pressure of $80/48\text{ mm Hg}$ despite a $3\text{-L}$ intravenous crystalloid bolus and initiation of norepinephrine, and respiratory rate of $24\text{/min}$ . Physical examination demonstrates a lethargic, diaphoretic patient with pronounced left costovertebral angle tenderness.

Laboratory analysis reveals:

Test	Result
Leukocyte count	$24,500/\mu\text{L}$ (with $18\%$ bands)
Hemoglobin	$11.2\text{ g/dL}$
Platelet count	$98,000/\mu\text{L}$
Serum creatinine	$2.6\text{ mg/dL}$ (Baseline: $0.8\text{ mg/dL}$ )
Lactic acid	$4.8\text{ mmol/L}$

A non-contrast computed tomography scan of the abdomen and pelvis shows severe left hydroureteronephrosis secondary to an $11\text{-mm}$ radiopaque calculus lodged at the ureteropelvic junction, accompanied by significant perinephric fat stranding. Broad-spectrum intravenous antibiotics are currently being administered.

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

Placement of a percutaneous nephrostomy tubeAnswer
B
Extracorporeal shock wave lithotripsy
C
Retrograde ureteroscopy with stone extraction
D
Open surgical ureterolithotomy
E
Bilateral retrograde pyelography

Answer

Placement of a percutaneous nephrostomy tube

This patient is presenting with septic shock secondary to an obstructing ureteral calculus. An infected, obstructed urinary tract is a true urologic emergency because the elevated intrapelvic pressure impairs antibiotic penetration and continuously seeds bacteria into the systemic circulation. The most critical step in management, alongside fluid resuscitation and broad-spectrum antibiotics, is immediate decompression of the collecting system to achieve source control. Placement of a percutaneous nephrostomy tube (or a retrograde double-J ureteral stent) provides rapid, minimally invasive drainage of the infected urine. Definitive management of the stone itself must be deferred until the patient is hemodynamically stable and the infection has been adequately treated.

Step-by-Step Solution

Identify the patient's clinical syndrome based on the presentation and vital signs.

The patient is in septic shock (hypotension requiring vasopressors, lactic acidosis, fever, leukocytosis).

Recognizing the severity of the illness dictates the urgency and type of intervention required.

Correlate the physical exam and imaging findings with the clinical syndrome to determine the source of infection.

The CT scan and physical exam confirm an infected, obstructed left kidney (obstructive pyelonephritis/urosepsis) secondary to an 11-mm calculus.

An obstructed and infected kidney behaves as a closed-space abscess that continuously seeds bacteria into the bloodstream.

Select the most appropriate definitive intervention for this specific urologic emergency.

Immediate decompression of the collecting system via a percutaneous nephrostomy tube (or retrograde ureteral stent) is required.

In hemodynamically unstable patients, minimally invasive source control is mandatory, whereas definitive stone removal procedures are contraindicated until the patient stabilizes.

Key Concept

In patients with obstructive pyelonephritis and septic shock, urgent decompression of the urinary tract via percutaneous nephrostomy or ureteral stenting is required for source control; definitive stone removal is deferred until the infection resolves.

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