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COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Cardiovascular effects of elgodipine and nifedipine compared in anaesthetized rats.
European Journal of Pharmacology 1997 September 25
The cardiovascular effects of elgodipine were studied and compared with those of nifedipine in the presence or absence of ganglion blockade. A bolus of elgodipine (5-25 microg/kg) or nifedipine (60-120 microg/kg) was given and sequential cardiovascular effects in rats were recorded. Both dihydropyridines induced a dose-dependent decrease in mean arterial pressure but, whereas nifedipine induced reflex tachycardia, elgodipine induced a dose-dependent bradycardia. Both substances induced decreases in left ventricular d P/dt(max) without significant changes in central venous pressure. Good linear correlation was observed between the elgodipine-induced decrease in mean arterial pressure and those of heart rate and left ventricular dP/dt(max). The profile of the decrease in mean arterial pressure in animals pretreated with hexametonium chloride (20 mg/kg) was the same but the nifedipine-induced tachycardia was abolished without changes in elgodipine-induced bradycardia. These characteristics of elgodipine makes this dihydropyridine a potentially beneficial therapeutic agent in the case of severe hypertension accompanied by obstructive coronopathy.
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