title: [Clinical experiences of semi-sitting astride position for extracorporeal shock wave lithotripsy treatment of urethral calculi].
abstract: OBJECTIVE
  To explore the therapeutic feasibility, safety and efficacy of semi-sitting astride position for extracorporeal shock wave lithotripsy (SWL) of urethral calculi.
  
  
  METHODS
  A total of 7 male cases of urethral calculi from November 1997 to August 2013 were enrolled. Their age range was 24-52 years. There were anterior (n = 1) and posterior (n = 6) urethral calculi. The diameter range of stone was 0.5 cm×0.5 cm to 1.0 cm×2.0 cm. BH-VG twin-pulse low-energy SWL was employed with a semi-sitting astride position. The average frequency was 2 500 (1 800-3 500) times. And the treatment voltage was 3-8 kV.
  
  
  RESULTS
  Both stone fragmentation rate and stone-free rate 1 hour post-SWL was 100%.No severe complications occurred.
  
  
  CONCLUSIONS
  Semi-sitting astride position SWL is simple, safe, effective and feasible for posterior urethral calculi.
authors.affiliation: Department of Urology, Peking University First Hospital, Institute of Urology, Beijing 100034, China.
authors.forename: Lili
authors.initials: L
authors.lastname: Liang
authors.affiliation: Department of Urology, Peking University First Hospital, Institute of Urology, Beijing 100034, China. Email: guoxj70@126.com.
authors.forename: Xiaojian
authors.initials: X
authors.lastname: Guo
authors.affiliation: Department of Urology, Peking University First Hospital, Institute of Urology, Beijing 100034, China.
authors.forename: Yinglu
authors.initials: Y
authors.lastname: Guo
authors.affiliation: Department of Urology, Peking University First Hospital, Institute of Urology, Beijing 100034, China.
authors.forename: Lizhu
authors.initials: L
authors.lastname: Yang
authors.affiliation: Department of Urology, Peking University First Hospital, Institute of Urology, Beijing 100034, China.
authors.forename: Liqun
authors.initials: L
authors.lastname: Zhou
mesh_terms: D000328:Adult; D006801:Humans; D008096:Lithotripsy / Q000379:methods*; D008297:Male; D008875:Middle Aged; D056888:Patient Positioning; D011187:Posture; D014545:Urinary Calculi / Q000601:surgery*