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Do beta-blockers really increase peripheral vascular resistance? Review of the literature and new observations under basal conditions.

Abstract：

:Most antihypertensive drugs act by counteracting vasoconstrictor mechanisms and lower blood pressure by lowering vascular resistance. The beta-blockers, which have the unique feature of counteracting cardiac sympathetic drive, seem to be a major exception to this generalization. Moreover, their degree of cardiodepression is not only directly correlated with the initial sympathetic tone, but also with their degree of intrinsic sympathicomimetic activity (ISA). Cardiodepression initially evokes a proportional rise in vascular resistance. As indicated by review of the literature, the antihypertensive effect of beta-blockers always parallels a decline in vascular resistance. Minimizing cardiac sympathetic drive by strict bedrest and studying beta-blockers with different degrees of ISA in 50 hypertensive patients showed that initially the effect of the drugs is offset by a rise in vascular resistance proportional to the fall in cardiac output. After that, blood pressure always fell parallel with the decline in vascular resistance. In the long run blood pressure and vascular resistance were always positively correlated, whatever the level of cardiac output. Thus, like all other antihypertensive agents, beta-blockers also lower blood pressure through interference with a vasoconstrictor mechanism.

journal_name

Am J Hypertens

journal_title

American journal of hypertension

authors

Man in't Veld AJ,Van den Meiracker AH,Schalekamp MA

doi

10.1093/ajh/1.1.91

subject

Has Abstract

pub_date

1988-01-01 00:00:00

pages

91-6

issue

1

eissn

0895-7061

issn

1941-7225

journal_volume

1

pub_type

杂志文章,评审

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