Minipercutaneous Nephrolithotomy

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Abstract
Purpose: To evaluate the safety and efficacy of a minipercutaneous nephrolithotomy procedure (mini-PCNL) through a 20F sheath. Patients and Methods: Twenty-one patients underwent a mini-PCNL from October 1997 to October 1999. The mean number of calculi was 1.8 (range 1–9). The mean cross-sectional area of the stone burden was 2.8 cm2 (range 0.72–6.5 cm2). Nephrostomy tract dilation was performed with an 18F Cook Omega® or Pursuit® balloon dilation catheter (6-mm diameter, 10-cm length; 12 or 14 atm, respectively), and a 20F nephrostomy sheath was advanced over the inflated balloon. Results: The mean operative time was 54 minutes. The mean decrease in hematocrit was 3.4%, and no patient required a blood transfusion. The mean percutaneous tube duration was 22 hours. The mean hospital stay was 1.1 days. The single-procedure stone-free rate was 90%. Two patients underwent successful SWL of residual middle-caliceal calculi that could not be accessed through the existing tract. There were no major comp...