Effect of alpha-alpha diaspirin crosslinked hemoglobin (DCLHb) on the potency of sodium nitroprusside and nitroglycerine to decrease blood pressure in rats: a dose-response study.
The nitrovasodilators, sodium nitroprusside and nitroglycerine, effect a dose-dependent decrease in mean arterial blood pressure (MABP) by liberating nitric oxide. Alpha-alpha diaspirin crosslinked hemoglobin (DCLHb) is known to bind nitric oxide. We studied the effect of DCLHb on the potency of sodium nitroprusside (n=36) and nitroglycerine (n=36) to decrease MABP in rats which received 1, 10, 100, 1,000, or 10,000 mg/kg of the DCLHb, or normal saline as the Control. Six doses of sodium nitroprusside or nitroglycerine were given to each rat in a systematically varied sequence. For both drugs, in rats given 1, 10, or 100 mg/kg of DCLHb there were no between groups differences in the change in MABP compared to the Control group. For rats that received 1,000 or 10,000 mg/kg of DCLHb, the potency of nitroglycerine and sodium nitroprusside to decrease MABP was less (p<0.05) than the other groups. These data support the hypothesis that small doses of DCLHb effect a minimal change in the potency of nitrovasodilators to reduce blood pressure. However, they suggest that clinically relevant doses of DCLHb attenuate the vasodilatory ability of sodium nitroprusside and nitroglycerine.
Erhart
S M
SM
Department of Anesthesiology, Loma Linda University, CA 92354, USA.
Cole
D J
DJ
Patel
P M
PM
Drummond
J C
JC
Burhop
K E
KE
D000818:Animals; D001241:Aspirin / Q000031:analogs & derivatives* / Q000494:pharmacology*; D001794:Blood Pressure / Q000187:drug effects; D001802:Blood Substitutes / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004353:Drug Evaluation, Preclinical; D006454:Hemoglobins / Q000494:pharmacology*; D008297:Male; D005996:Nitroglycerin / Q000494:pharmacology; D009599:Nitroprusside / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D014665:Vasodilator Agents
D001802:Blood Substitutes; D006454:Hemoglobins; D014665:Vasodilator Agents; D009599:Nitroprusside; C083478:diaspirin-cross-linked hemoglobin; D005996:Nitroglycerin; D001241:Aspirin