Abstract
An increase in intracellular calcium has been identified as an etiologic factor in acute renal failure (ARF) and blockade of slow calcium channels has been successful in its amelioration. Diuretics may also prevent or mitigate the effects of renal ischemia. We examined the actions of a new calcium channel blocker, nitrendipine (NTR), given intravenously to rats prior to bilateral clamping of the renal pedicle for 45-60 min. Four groups of rats were studied. Group I: Rats given the vehicle only and subjected to sham surgery had a creatinine clearance (Ccr) of .93 +/- .05 ml/min (n = 20). Group II: Rats given NTR (1 or 3 mg/kg) and subjected to sham surgery had a Ccr of .65 +/- .03 ml/min (n = 17). Group III: The infusion of the vehicle alone 10-15 min before clamping resulted in a Ccr of .12 +/- .02 ml/min (n = 23, p less than .001 vs. group I). Group IV: Rats given NTR and then clamped had a Ccr of .30 +/- .04 ml/min (n = 31, p less than .001 vs. group III, p less than .001 vs. group II). Higher doses of NTR did not improve the results. We concluded that NTR partially protects against ARF, but NTR lowered Ccr compared to control rats (p less than .001, group I vs. group II).
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