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Difficulty: MediumSurgical and Procedural Interventions

A 64-year-old woman arrives at the emergency department with a 24-hour history of severe right-sided flank pain, intense chills, and acute confusion. Vital signs reveal a temperature of 39.2∘C39.2^\circ\text{C} (102.6∘F102.6^\circ\text{F}), blood pressure of 88/54 mmHg, and a heart rate of 118/min. Physical examination is notable for exquisite right costovertebral angle tenderness. Initial laboratory evaluation demonstrates a leukocyte count of 18,500/mm318,500/\text{mm}^3 and a serum creatinine level of 1.9 mg/dL1.9 \text{ mg/dL}. A non-contrast CT scan of the abdomen and pelvis shows a 9-mm calculus in the proximal right ureter accompanied by severe hydronephrosis and perinephric fat stranding.

Arrange the following patient management and procedural interventions in the most appropriate chronological sequence for this patient.

  1. 1Administration of intravenous crystalloids and empiric broad-spectrum antibiotics
  2. 2Urgent decompression of the renal collecting system via percutaneous nephrostomy
  3. 3Definitive calculus extraction via ureteroscopy and laser lithotripsy
  4. 4Removal of the percutaneous nephrostomy drainage tube

Answer

The correct chronological sequence is: 1) Administration of intravenous crystalloids and empiric broad-spectrum antibiotics, 2) Urgent decompression of the renal collecting system via percutaneous nephrostomy, 3) Definitive calculus extraction via ureteroscopy and laser lithotripsy, and 4) Removal of the percutaneous nephrostomy drainage tube.
The management of an infected obstructing ureteral stone follows a strict protocol of medical stabilization, urgent source control, and delayed definitive treatment. Initial management requires fluid resuscitation and broad-spectrum antibiotics to address the septic shock. This must be immediately followed by urgent decompression of the collecting system (via percutaneous nephrostomy or retrograde ureteral stent) to drain the purulent urine under pressure. Definitive stone removal (ureteroscopy) is strictly contraindicated during the acute infection due to the risk of worsening sepsis from intraoperative irrigation fluid pressure. It is instead performed electively weeks later after the patient has completely stabilized. Finally, the nephrostomy tube is removed once stone clearance and ureteral patency are confirmed.

Step-by-Step Solution

1
Administer intravenous crystalloids and broad-spectrum antibiotics.
Restores intravascular volume and initiates antimicrobial action against the systemic infection.
The patient is in septic shock (hypotension, fever, leukocytosis) secondary to an infected obstructing stone. Immediate medical stabilization is required before any surgical intervention.
2
Perform urgent decompression of the renal collecting system.
Drains purulent urine under pressure from the renal pelvis.
An infected and obstructed kidney is a surgical emergency. Decompression via a percutaneous nephrostomy tube or ureteral stent provides necessary source control for the infection.
3
Delay definitive stone extraction until sepsis resolves, then perform elective ureteroscopy.
Safely fragments and removes the obstructing 9-mm calculus.
Performing lithotripsy during active infection involves irrigating the urinary tract, which dramatically increases intrarenal pressure and can precipitate fatal septic shock.
4
Remove the percutaneous nephrostomy drainage tube.
Completes the procedural intervention sequence.
The drainage tube is no longer needed once the obstruction is definitively relieved and normal ureteral patency is confirmed.

Key Concept

The initial management of an infected obstructing ureteral stone requires urgent systemic resuscitation followed immediately by decompression (source control) via percutaneous nephrostomy or ureteral stenting; definitive stone treatment is delayed until the infection fully resolves.
Estimated Time:1m 30s
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Surgical and Procedural Interventions

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