Abstract |
The present study was undertaken to elucidate the anti-tachycardic effect of a direct-acting vasodilator, budralazine, using an electrophysiological technique. Normotensive male Wistar rats were used. Rats were anesthetized intraperitoneally with urethane and alpha-chloralose. Intravenous administration of budralazine (0.5-5.0 mg/kg) produced a dose-dependent reduction of mean arterial pressure in anesthetized rats. At doses of 0.5 and 1.0 mg/kg, budralazine induced bradycardia accompanied with a decrease in cardiac sympathetic nerve activity (ICNA). Preganglionic adrenal sympathetic nerve activity (ASNA) was also reduced by budralazine (1.0 mg/kg). A 0.5 mg/kg of budralazine neither influenced carotid sinus nerve activity nor augmented aortic depressor nerve activity (ADNA). On the contrary, at dose of 5.0 mg/kg, budralazine produced a tachycardia accompanied with increases in both ICNA and ASNA. The ADNA was decreased by budralazine (5.0 mg/kg) significantly. These findings suggest that the central sympathoinhibitory action of budralazine may be responsible for the anti-tachycardic effect of budralazine and baroreceptor-mediated tachycardia occurred after high dose of budralazine.
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Authors | M Yoshioka, M Minami, H Saito |
Journal | Clinical and experimental hypertension. Part A, Theory and practice
(Clin Exp Hypertens A)
Vol. 13
Issue 5
Pg. 1107-14
( 1991)
ISSN: 0730-0077 [Print] United States |
PMID | 1773498
(Publication Type: Journal Article)
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Chemical References |
- Vasodilator Agents
- Hydralazine
- budralazine
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Topics |
- Afferent Pathways
(drug effects)
- Animals
- Blood Pressure
(drug effects)
- Carotid Sinus
(innervation)
- Efferent Pathways
(drug effects)
- Heart
(innervation)
- Heart Rate
(drug effects)
- Hemodynamics
(drug effects)
- Hydralazine
(analogs & derivatives, pharmacology)
- Male
- Pressoreceptors
(drug effects)
- Rats
- Rats, Inbred Strains
- Sympathetic Nervous System
(drug effects)
- Vasodilator Agents
(pharmacology)
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