RESUMO
INTRODUCTION: Percutaneous nephrolithotomy (PCNL) is the first-line treatment for large and complex renal calculi. Accepted UK practice is to insert a nephrostomy tube at the end of the procedure to drain the kidney and reduce potential complications. 'Tubeless' or 'nephrostomy-free' PCNL has been advocated in selected patients as it is thought to reduce length of hospital stay, analgesia requirements and pain experienced. We present our outcomes of a consecutive series (n = 101) of 'nephrostomy-free' PCNLs compared to standard PCNL over a 4-year period. PATIENTS AND METHODS: Between January 2004 and October 2006, we performed 55 standard (with nephrostomy tube) PCNLs (Group 1). From October 2006 onwards, we changed our technique and have performed 46 consecutive 'nephrostomy-free' PCNLs (JJ stent inserted), independent of patient and stone factors (Group 2). We have compared the two groups in terms of length of hospital stay (LOS), analgesia requirements, transfusion rates, haemoglobin (Hb) decrease and immediate, early and late complications. RESULTS: 'Nephrostomy-free' PCNL significantly reduced the length of hospital stay (2.8 vs 5.1 days; P < 0.001), morphine-based analgesia requirements (23% no morphine required vs 2.8%; P < 0.001), transfusion rate (2.5% vs 7%; P < 0.01) and mean Hb decrease (1.89 g/dl vs 2.25 g/dl; P > 0.05). Overall, no patient experienced a serious complication. All attempted 'nephrostomy-free' PCNLs were completed (stone clearance 95%) and no patient needed an unplanned nephrostomy. Only 5% in Group 2 needed their ureteric JJ stent removing earlier than planned secondary to pain. Both groups were comparable in terms of immediate, early and late complications, though three patients in Group 1 developed chronic loin pain and one patient in the 'nephrostomy-free' group developed a delayed perirenal haematoma. CONCLUSIONS: 'Nephrostomy-free' percutaneous nephrolithotomy is a safe, effective and feasible procedure independent of patient and stone factors. It decreases the length of hospital stay, the pain experienced and the need for morphine-based analgesia; we feel it should be the standard of care for patients undergoing a PCNL.
