title: Parenchymal thickness: does it have an impact on outcomes of percutaneous nephrolithotomy?
abstract: OBJECTIVE
  To evaluate whether renal parenchymal thickness (RPT) has an effect on the outcomes of percutaneous nephrolithotomy (PNL).
  
  
  METHODS
  We performed a retrospective analysis of 144 patients with lower pole and/or renal pelvic stones who underwent PNL. The relationship between RPT and peri- and postoperative measures was evaluated.
  
  
  RESULTS
  The average age was 45.94 ± 14.47 (15-76) years. The mean BMI was calculated as 27.47 ± 4.73 (16.9-44.9) kg/m(2). The mean stone burden was 293 ± 126 (150-800 mm(2)). The mean RPT was measured as 17.33 ± 5.32 (6-35) mm. No correlation was detected between the RPT and the operation or fluoroscopy times or the duration of hospitalization (p = 0.63, 0.52, 0.08, respectively). The mean drop in hemoglobin level was 1.45 ± 1.25 (0-9) g/dl. A negative correlation was detected between hemoglobin drop and RPT (p = 0.01, r = -0.23). However, the RPT was similar in patients who did or did not require a blood transfusion (p = 0.09). The RPT was found to have no impact on success rate (p = 0.4).
  
  
  CONCLUSIONS
  The postoperative hemoglobin drop increases in parallel with the increase in RPT. However, no relationship was detected between the RPT and blood transfusion, overall success rate or any other perioperative parameters.
authors: Department of Urology, Faculty of Medicine, Bezmialem Vakif University, Istanbul, Turkey. akadirtepeler@yahoo.com
authors: Abdulkadir
authors: A
authors: Tepeler
authors: Murat
authors: M
authors: Binbay
authors: Tolga
authors: T
authors: Akman
authors: Akif
authors: A
authors: Erbin
authors: Cem
authors: C
authors: Kezer
authors: Mesrur Selcuk
authors: MS
authors: Silay
authors: Emrah
authors: E
authors: Yuruk
authors: Sina
authors: S
authors: Kardas
authors: Muzaffer
authors: M
authors: Akçay
authors: Abdullah
authors: A
authors: Armagan
authors: Ahmet Yaser
authors: AY
authors: Muslumanoglu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015415:Biomarkers / Q000097:blood; D001803:Blood Transfusion; D015536:Down-Regulation; D005260:Female; D005471:Fluoroscopy; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D007669:Kidney Calculi / Q000175:diagnosis / Q000601:surgery*; D007682:Kidney Pelvis / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009403:Nephrostomy, Percutaneous / Q000009:adverse effects; D019106:Postoperative Hemorrhage / Q000097:blood / Q000209:etiology / Q000628:therapy; D015641:Radiography, Interventional; D012189:Retrospective Studies; D012307:Risk Factors; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D015415:Biomarkers; D006454:Hemoglobins