Abstract:
:Several mechanisms have been suggested for the absence of reflex tachycardia in response to the hypotensive effect of the selective alpha 1-adrenoceptor antagonist indoramin, including, in animals, membrane-stabilising activity, prolongation of repolarisation time, and reduction in baroreflex sensitivity. The present study investigated the effect of acute and chronic oral administration of indoramin (50 mg daily for 8 days) on baroreflex sensitivity in six healthy male volunteers. Baroreflex function was measured by determining the relationship between systolic blood pressure (SBP) and R-R interval following intravenous administration of phenylephrine. Indoramin shifted (p less than 0.05) the phenylephrine dose-response curve to the right on days 1 and 8 compared with placebo. Baroreflex sensitivity [R-R (ms)/SBP (mm Hg)] was reduced (p less than 0.05) by indoramin on day 1 compared with placebo (18.3 +/- 1.3 vs. 11.2 +/- 2.2 ms/mm Hg), and on day 8 compared with pretreatment values (18.3 +/- 2.8 vs. 10.8 +/- 1.8 ms/mm Hg). Acute but not chronic administration of indoramin caused (p less than 0.05) sedation; tremor tended to increase with chronic administration. It is suggested that depression of baroreflex sensitivity by indoramin may explain, in part, the lack of reflex tachycardia associated with its antihypertensive effect.
journal_name
J Cardiovasc Pharmacoljournal_title
Journal of cardiovascular pharmacologyauthors
Deering AH,Riddell JG,Harron DW,Shanks RGdoi
10.1097/00005344-198803000-00004subject
Has Abstractpub_date
1988-03-01 00:00:00pages
284-90issue
3eissn
0160-2446issn
1533-4023journal_volume
11pub_type
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journal_title:Journal of cardiovascular pharmacology
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journal_title:Journal of cardiovascular pharmacology
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journal_title:Journal of cardiovascular pharmacology
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
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journal_title:Journal of cardiovascular pharmacology
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journal_title:Journal of cardiovascular pharmacology
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journal_title:Journal of cardiovascular pharmacology
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journal_title:Journal of cardiovascular pharmacology
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
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journal_title:Journal of cardiovascular pharmacology
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