title: Limitation of shock-wave-induced renal tubular dysfunction by nifedipine.
abstract: In a prospective randomized study, the effects of the calcium entry blocker nifedipine on shock-wave-induced tubular impairment were studied. 24 patients with renal pelvic or calyceal stones undergoing anesthesia-free extra-corporeal shock wave lithotripsy (ESWL) without ancillary measures were randomly assigned to the nifedipine group (n = 12) or the control group (n = 12). Four doses of nifedipine (10 mg t.i.d.) were given orally, starting the night before ESWL. Controls received no medication. To assess renal tubular function, the urinary excretion of alpha 1-microglobulin (A1M), N-acetyl-beta-glucosaminidase (NAG) and Tamm-Horsfall protein (THP) were measured before, immediately, 12 and 24 h after ESWL. After lithotripsy, there was a rise in urinary A1M and NAG which was significantly higher in the control than in the nifedipine group. THP, a glycoprotein synthesized by distal tubular cells, fell significantly less in the nifedipine group compared to the controls. Our results indicate that nifedipine exhibits a protective effect on shock-wave-induced tubular damage similar to verapamil. The underlying mechanisms are not clarified yet, direct actions on tubular cells and interference with renal hemodynamics have to be discussed.
authors.affiliation: Department of Urology, Eberhard-Karls-University, Tübingen, FRG.
authors.forename: W L
authors.initials: WL
authors.lastname: Strohmaier
authors.forename: J
authors.initials: J
authors.lastname: Koch
authors.forename: N
authors.initials: N
authors.lastname: Balk
authors.forename: D M
authors.initials: DM
authors.lastname: Wilbert
authors.forename: K H
authors.initials: KH
authors.lastname: Bichler
mesh_terms: D000118:Acetylglucosaminidase / Q000652:urine; D000510:Alpha-Globulins / Q000652:urine; D006801:Humans; D007669:Kidney Calculi / Q000628:therapy; D007684:Kidney Tubules / Q000503:physiopathology*; D008096:Lithotripsy / Q000009:adverse effects*; D009088:Mucoproteins / Q000652:urine; D009543:Nifedipine / Q000627:therapeutic use*; D011446:Prospective Studies; D011480:Protease Inhibitors / Q000652:urine; D058949:Uromodulin
chemical_list: D000510:Alpha-Globulins; D009088:Mucoproteins; D011480:Protease Inhibitors; C548612:UMOD protein, human; D058949:Uromodulin; C016001:alpha-1-microglobulin; D000118:Acetylglucosaminidase; D009543:Nifedipine