title: Effect of alkalinization on calcium oxalate monohydrate calculi during extracorporeal shock wave lithotripsy: in vivo experiments.
abstract: Previous in vitro experiments demonstrated the reduced microhardness of calcium oxalate monohydrate (COM) calculi, relative to dry values, when saturated with an alkaline solution (pH = 9.5). Nineteen patients with a COM calculus in the distal ureter which had been resistant to prior extracorporeal shock wave lithotripsy in situ, were treated when the stone was surrounded by alkaline urine. The urine of 14 patients was alkalinized orally by administration of acetazolamine and citrate solution; in 5 other patients direct percutaneous irrigation of sodium bicarbonate via a nephrostomy tube was carried out. The urinary pH just before lithotripsy was greater than or equal to 9 in 17/19 patients. 4,000 shock waves, averaging 18.1 kV generated by the Siemens Lithostar, were delivered onto the calculus. No significant increase of comminution rate was apparent at radiographic control immediately after the treatment and only in half of the cases was evacuation obtained within 3 months.
authors.affiliation: Department of Urology, University Hospital Sint-Pieter, Leuven, Belgium.
authors.forename: H
authors.initials: H
authors.lastname: Vandeursen
authors.forename: D
authors.initials: D
authors.lastname: De Ridder
authors.forename: R
authors.initials: R
authors.lastname: Demeulenaere
authors.forename: G
authors.initials: G
authors.lastname: Pittomvils
authors.forename: R
authors.initials: R
authors.lastname: Boving
authors.forename: L
authors.initials: L
authors.lastname: Baert
mesh_terms: D001639:Bicarbonates / Q000627:therapeutic use; D002129:Calcium Oxalate / Q000032:analysis*; D002951:Citrates / Q000627:therapeutic use; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008096:Lithotripsy; D008297:Male; D008875:Middle Aged; D012964:Sodium / Q000627:therapeutic use; D017693:Sodium Bicarbonate; D014514:Ureteral Calculi / Q000737:chemistry / Q000628:therapy*
chemical_list: D001639:Bicarbonates; D002951:Citrates; D002129:Calcium Oxalate; D017693:Sodium Bicarbonate; D012964:Sodium