title: The Daily Resistive Index measurement useful tool in the estimation of the optimal time interval between two Shock Wave Lithotripsy sessions.
abstract: OBJECTIVE
  : To monitor the impact of Shock Wave Lithotripsy (SWL) on the renal resisive index (RI) and to investigate the potential of the RI measurement for the estimation of the optimal duration between 2 SWL sessions.
  
  
  METHODS
  Thirty patients with single pelvis renalis stone were included. Participitants were grouped according to their age as group 1 (<40 years, mean age 36.2+/-3.9 years) and group 2 (>/=40 years, mean age 55.4+/-6.5 years). RI measurement was performed in of all patients prior to SWL. After SWL, RI was monitored daily until RI returned to their pre-SWL values.
  
  
  RESULTS
  The mean stone size was 2 8.97+/-3.62 in group 1 and 10.08+/-4.67 mm in group 2 (p=0.077). Following SWL, the RI value of both goups increased and the higher RI value was measured at the 24th hour as compared with their pre-SWL values (p<0.001). In day 2 RI of the groups declined, but the differences were still statistically different from their pre-SWL RI values (p<0.001). However, on the third day, RI of group 1 was close to their pre-SWL level (p=0.143). But, in group 2, RI value returned to their pre-SWL limits on day 4 (p=0.229).
  
  
  CONCLUSIONS
  RI measurement gives important data regarding SWL related acute renal trauma and should be used as an US marker for recovery after SWL.
authors.affiliation: Department of Radiology, Haydarpasa Numune Education and Research Hospital, Istanbul, Turkey. e.yenclek@yahoo.com.
authors.forename: Esin
authors.initials: E
authors.lastname: Yencilek
authors.affiliation: Department of Radiology, Yeditepe University Medical Faculty, Istanbul, Turkey.
authors.forename: Aysegul
authors.initials: A
authors.lastname: Sarsılmaz
authors.affiliation: Department of Radiology Istanbul Education Hospital, Istanbul, Turkey.
authors.forename: Ozgur
authors.initials: O
authors.lastname: Kilickesmez
authors.affiliation: Department of Urology, Yeditepe University Medical Faculty, Istanbul, Turkey.
authors.forename: Hakan
authors.initials: H
authors.lastname: Koyuncu
authors.affiliation: Department of Urology Kartal Lutfi Kırdar Education and Research Hospital, Istanbul, Turkey.
authors.forename: Bilal
authors.initials: B
authors.lastname: Eryildirim
authors.affiliation: Department of Radiology, Yeditepe University Medical Faculty, Istanbul, Turkey.
authors.forename: Bengi
authors.initials: B
authors.lastname: Gurses
authors.affiliation: Department of Urology Beykoz State Hospital, Istanbul, Turkey.
authors.forename: Yavuz
authors.initials: Y
authors.lastname: Bastug
authors.affiliation: Department of Urology, Yeditepe University Medical Faculty, Istanbul, Turkey.
authors.forename: Bilger
authors.initials: B
authors.lastname: Erihan
mesh_terms: D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging*; D007669:Kidney Calculi / Q000000981:diagnostic imaging* / Q000628:therapy*; D008096:Lithotripsy / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D013997:Time Factors; D016896:Treatment Outcome; D018615:Ultrasonography, Doppler, Color