title: Effect of simple malrotation on percutaneous nephrolithotomy: a matched pair multicenter analysis.
abstract: OBJECTIVE
  In this multicenter study we compared the outcome of percutaneous nephrolithotomy in patients with and without malrotated kidneys.
  
  
  METHODS
  A total of 44 patients (group 1) at 6 institutions who underwent percutaneous nephrolithotomy for kidneys with simple malrotation were enrolled in our study. Attending physicians in our group also provided the same number of cases of percutaneous nephrolithotomy done for nonmalrotated (normal) kidneys (group 2). Group 2 patients were selected by match pairing. Operative and postoperative data on the 2 groups were compared using the chi-square, Student t and Fisher exact tests.
  
  
  RESULTS
  As a result of match pairing, the 2 groups were similar in age, gender, body mass index, and stone size and site. Mean ± SD stone size was 5.9 ± 3.5 cm(2) in group 1. Multiple access attempts were required in 9 (20.5%) and 7 cases (15.9%) in groups 1 and 2, respectively (p >0.05). Mean fluoroscopy time was 7.0 ± 3.9 minutes in the malrotated kidney group and 7.3 ± 4.5 minutes in the nonmalrotated kidney group (p >0.05). The mean hemoglobin decrease after percutaneous nephrolithotomy was significantly higher in group 1 (-1.9 vs -1.3 gm/dl, p = 0.008) but the blood transfusion rate was similar in the 2 groups. The procedure success rate in groups 1 and 2 was 77.3% and 79.5%, respectively (p >0.05).
  
  
  CONCLUSIONS
  Percutaneous nephrolithotomy is safe and effective even in patients with larger kidney stones and malrotated kidneys.
authors.affiliation: Department of Urology, Haseki Training and Research Hospital, Istanbul, Turkey. muratbinbay@yahoo.com
authors.forename: Murat
authors.initials: M
authors.lastname: Binbay
authors.forename: Okan
authors.initials: O
authors.lastname: Istanbulluoglu
authors.forename: Mustafa
authors.initials: M
authors.lastname: Sofikerim
authors.forename: Ali
authors.initials: A
authors.lastname: Beytur
authors.forename: Andreas
authors.initials: A
authors.lastname: Skolarikos
authors.forename: Tolga
authors.initials: T
authors.lastname: Akman
authors.forename: Emre
authors.initials: E
authors.lastname: Huri
authors.forename: Bulent
authors.initials: B
authors.lastname: Ozturk
authors.forename: Ali Riza
authors.initials: AR
authors.lastname: Kural
authors.forename: Ahmet Yaser
authors.initials: AY
authors.lastname: Muslumanoglu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016009:Chi-Square Distribution; D005260:Female; D006115:Greece; D006801:Humans; D007668:Kidney / Q000002:abnormalities* / Q000601:surgery; D007669:Kidney Calculi / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009403:Nephrostomy, Percutaneous; D011183:Postoperative Complications; D012189:Retrospective Studies; D014102:Torsion Abnormality / Q000150:complications*; D016896:Treatment Outcome; D014421:Turkey