Effects of benidipine hydrochloride (Coniel®), a new calcium antagonist, on the cardiac output, regional blood flow and vascular resistance in conscious, spontaneously hypertensive rats
✍ Scribed by Hideyoshi Harashima; Hiroshi Kiwada; Jirou Kajita; Satoshi Kobayashi
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 453 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0142-2782
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✦ Synopsis
Abstract
Benidipine hydrochloride is a calcium antagonist with a 1,4‐dihydropyridine derivative structure, and exhibits long‐lasting antihypertensive effects by inhibiting the voltagedependent Ca^2+^ channels. This study was undertaken to examine the effect of benidipine on central haemodynamics and regional blood flow (RBF) after intravenous administration of benidipine in conscious, spontaneously hypertensive rats. The microsphere method was used to measure cardiac output and RBF before and after the drug administration, using microspheres labelled with ^57^Co and ^51^Cr. Thirty minutes after the intravenous administration of benidipine (3 μg kg^−1^), the mean arterial pressure fell by 15% without significantly increasing the heart rate. The cardiac output increased by 41% and the systemic resistance decreased by 39%. Benidipine significantly increased RBF by 37,35, and 22% in kidney, heart, and small intestine, respectively, and decreased vascular resistance by 38, 38, and 32%, respectively. We concluded that benidipine reduced blood pressure by increasing RBF in the kidney and heart, while keeping RBF in other organs at a normal level. These results will provide a fundamental basis in support of the clinical benefits of benidipine for hypertensive patients, particularly those with renal failure.