An obstructed, infected upper tract is one of the few genuine emergencies in urology, and the commonest error is treating it as a stone problem. A patient with fever, flank pain and an obstructing calculus needs decompression within hours — a ureteric stent or a percutaneous nephrostomy, whichever your unit can deliver fastest at that hour — plus antibiotics and resuscitation. Definitive stone treatment belongs weeks later, once the urine is sterile and the patient is well.
The temptation to do the definitive operation in the same sitting is strong, particularly when theatre access is difficult and the patient has travelled a long way. Resist it. Ureteroscopy in an infected obstructed system raises intrarenal pressure against a closed collecting system and is a reliable route to septic shock in someone who was merely unwell an hour earlier.
Two practical points that get missed. Send urine from the collecting system at the time of drainage, not just a bladder sample — they frequently grow different organisms, and it is the upper tract one that matters. And when the fever settles after drainage, do not let the patient disappear: an undrained stone with a stent in situ is a temporary arrangement, and the stent that is forgotten becomes encrusted and a far worse problem than the stone was.
- Decompress within hours; stent or nephrostomy, whichever is faster in your unit tonight.
- Do not attempt definitive stone treatment in the same sitting.
- Send urine from the collecting system at drainage — it often differs from the bladder culture.
- Book the definitive procedure before the patient leaves; the forgotten stent is the next emergency.
- Record the stent date somewhere the patient and the system both see it.
The statistics, in plain English
The reason speed matters here is that mortality in obstructive pyonephrosis rises with time to decompression rather than with antibiotic choice — antibiotics cannot reach a closed, infected space at useful concentration. That is why the decision is surgical and immediate, and why waiting for culture sensitivities before acting is the wrong instinct in this one situation.
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