title: Sectorial technetium-99m-dimercaptosuccinic acid scintigraphy for monitoring the effect of extracorporeal piezoelectric lithotripsy for calyceal calculi on regional renal function.
abstract: OBJECTIVE
  To apply a semiquantitative method for analysis of technetium-99m-dimercaptosuccinic acid ((99m)Tc-DMSA) renal scintigraphy for monitoring the effect of extracorporeal piezoelectric lithotripsy (EPL) in patients with calyceal stones on regional kidney function and to check whether EPL had caused any deleterious effect on the target calyceal renal parenchymal function.
  
  
  METHODS
  Forty patients (mean age 35 years) suffering from calyceal stones documented by abdominal plain radiography, intravenous urogram or abdominal ultrasound were studied. All patients were treated by EPL. (99m)Tc-DMSA scan was performed before and 4 weeks after EPL. Sector analysis involved calculation of the relative function of the target calyx to the function of the ipsilateral kidney and the relative function of the treated kidney to global renal function.
  
  
  RESULTS
  The stone sizes were 6-11 mm in diameter and 11 were located in the upper, 13 in the middle and 16 in the lower calyx. After EPL, the overall stone clearance rate was 85% (100% for calculi in the upper and middle calyces, 62% for lower calyces). The sector analysis did not show statistically significant change of the relative regional (calyceal) or whole kidney function between the pre- and post-EPL (99m)Tc-DMSA scans. Using sector analysis, EPL appeared to be a safe modality and its usage was not associated with any untoward effect on calyceal or whole kidney function.
  
  
  CONCLUSIONS
  Sector analysis of (99m)Tc-DMSA renal scan is a simple semiquantitative method for monitoring regional changes of kidney function after EPL for treatment of calyceal stone.
authors.affiliation: Department of Surgery, Division of Urology, Faculty of Medicine, Kuwait University, Safat, Kuwait.
authors.forename: A
authors.initials: A
authors.lastname: Al-Tawheed
authors.forename: K A
authors.initials: KA
authors.lastname: Al-Awadi
authors.forename: E O
authors.initials: EO
authors.lastname: Kehinde
authors.forename: I
authors.initials: I
authors.lastname: Loutfi
authors.forename: H
authors.initials: H
authors.lastname: Abdul-Haleem
authors.forename: S
authors.initials: S
authors.lastname: Al-Mohannadi
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging*; D007669:Kidney Calculi / Q000473:pathology / Q000628:therapy*; D007670:Kidney Calices / Q000000981:diagnostic imaging / Q000473:pathology; D008096:Lithotripsy / Q000379:methods*; D008297:Male; D017063:Outcome Assessment, Health Care / Q000379:methods; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D019783:Technetium Tc 99m Dimercaptosuccinic Acid
chemical_list: D019275:Radiopharmaceuticals; D019783:Technetium Tc 99m Dimercaptosuccinic Acid