Question

After a live renal transplant, urine output was observed immediately after removing arterial clamps. However, after shifting the patient to the ward, the patient develops anuria. Bladder irrigation is not helpful. What is the most likely diagnosis?

• A. Renal artery stenosis
• B. Catheter blockage
• C. Renal vein stenosis
• D. Acute rejection

Hint:

Troubleshooting early post-transplant anuria:
1. Flush the Foley catheter to rule out clot retention.
2. If the catheter is clear, immediately order a bedside Doppler Ultrasound to assess arterial inflow and venous outflow.
Sudden anuria = think Vascular (thrombosis/kinking). Slow decline = think Rejection or Toxicity.

Answer 1

The Correct Option is A

Concept:
The timeline and onset characteristics of post-transplant anuria provide critical clues to distinguish between immunological, urological, and vascular complications.
Explanation:
• The graft functioned perfectly on the operating table (producing immediate urine), demonstrating initial viability and ruling out primary non-function or delayed graft function common in deceased donors.

• A hyperacute immunological rejection usually manifests immediately upon unclamping in the OR. The kidney becomes cyanotic, mottled, and flaccid. Since urine was initially produced and anuria occurred later in the ward, acute or hyperacute rejection is unlikely to be the primary cause of sudden mechanical failure.

• Urological complications, such as a blocked Foley catheter due to blood clots, are a common cause of early postoperative anuria. However, the prompt explicitly states that "bladder irrigation is not helpful", effectively ruling out catheter blockage (Option B) and suggesting the problem lies higher up.

• The abrupt cessation of urine output shortly after transferring the patient to the ward strongly points to a mechanical vascular compromise.

• During patient transfer and repositioning, a technical imperfection at the arterial anastomosis can lead to kinking of the renal artery or the development of a severe intimal flap/stenosis.

• This acute severe renal artery stenosis (or early thrombosis secondary to it) drastically drops the perfusion pressure to the graft, leading to an immediate shutdown of glomerular filtration and sudden anuria.
Final Answer:
The sudden onset of anuria in the early postoperative phase that is unresponsive to catheter irrigation is most indicative of a catastrophic vascular inflow problem, such as renal artery kinking or stenosis.