title: PCNL--A comparative study in nonoperated and in previously operated (open nephrolithotomy/pyelolithotomy) patients--a single-surgeon experience.
abstract: OBJECTIVE
  Re-procedure in patients with history of open stone surgery is usually challenging due to the alteration in the retroperitoneal anatomy. The aim of this study was to determine the possible impact of open renal surgery on the efficacy and morbidity of subsequent percutaneous nephrolithotomy (PCNL).
  
  
  METHODS
  From March 2009 until September 2010, 120 patients underwent PCNL. Of these, 20 patients were excluded (tubeless or bilateral simultaneous PCNL). Of the remaining 100, 55 primary patients were categorized as Group 1 and the remaining (previous open nephrolithotomy) as Group 2. Standard preoperative evaluation was carried out prior to intervention, Statistical analysis was performed using SPSS v. 11 with the chi-square test, independent samples t-test, and Mann-Whitney U test. A p-value < 0.05 was taken as statistically significant.
  
  
  RESULTS
  Both groups were similar in demographic profile and stone burden. Attempts to access the PCS was less in Group 1 compared to Group 2 (1.2 + 1 2 vs. 3 + 1.3 respectively) and this was statistically significant (p < 0.04). However, the mean operative time between the two groups was not statistically significant (p = 0.44). Blood transfusion rate was comparable in the two groups (p = 0.24). One patient in Group 2 developed hemothorax following a supra-11th puncture. Remaining complications were comparable in both groups.
  
  
  CONCLUSIONS
  Patients with past history of renal stone surgery may need more attempts to access the pelvicaliceal system and have difficulty in tract dilation secondary to retroperitoneal scarring. But overall morbidity and efficacy is same in both groups.
authors.affiliation: Department of Surgery Government Medical College, Jammu and Kashmir, India. rajaguptadr@rediffmail.com
authors.forename: Rahul
authors.initials: R
authors.lastname: Gupta
authors.forename: Arti
authors.initials: A
authors.lastname: Gupta
authors.forename: Gursimran
authors.initials: G
authors.lastname: Singh
authors.forename: Abhineet
authors.initials: A
authors.lastname: Suri
authors.forename: Sandeep K
authors.initials: SK
authors.lastname: Mohan
authors.forename: C L
authors.initials: CL
authors.lastname: Gupta
mesh_terms: D000293:Adolescent; D000328:Adult; D016009:Chi-Square Distribution; D002921:Cicatrix / Q000150:complications; D005260:Female; D006801:Humans; D007431:Intraoperative Complications / Q000209:etiology; D007669:Kidney Calculi / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009403:Nephrostomy, Percutaneous / Q000009:adverse effects / Q000379:methods*; D011183:Postoperative Complications / Q000209:etiology; D012086:Reoperation / Q000379:methods; D012187:Retroperitoneal Space; D018709:Statistics, Nonparametric; D017211:Treatment Failure; D055815:Young Adult