Topic 01 / 42
Link to this entryMini-percutaneous nephrolithotomy compared with retrograde intrarenal surgery for renal calculi of one to two centimetres
- Primary outcome
- Stone-free status on non-contrast CT at one month, defined by a stated residual fragment size
- Collection time
- 18 months
- Sample, as a planning figure
- roughly 30–45 per arm, subject to a proper calculation
What your unit must already have
- a flexible ureteroscope with laser and a mini-PCNL set, both serviceable throughout
- non-contrast CT available for every patient at one month
- a surgeon doing both procedures regularly
What derails it
A flexible ureteroscope breaks and goes away for repair for weeks, which stops one arm dead; confirm there is a second scope or a service contract with a loaner before the protocol is submitted.