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Baroreflex sensitivity and its evolution during the first year after myocardial infarction.

Abstract：

:Experimental data have indicated that baroreflex sensitivity is often depressed in dogs after myocardial infarction and that this depression correlates strongly with subsequent mortality during episodes of acute myocardial ischemia. This finding has several clinical implications. The present study was undertaken with the objectives of assessing the potential existence of differences in baroreflex sensitivity between men with and without myocardial infarction and the time course during the 1st year after infarction of these potential changes in baroreflex sensitivity. Fifty-three subjects entered the study: 32 postinfarction patients and 21 control subjects. Baroreflex sensitivity was assessed by increasing mean blood pressure by aphenylephrine infusion (70 micrograms/ml) and recording the consequent RR interval changes. Baroreflex sensitivity, expressed as the slope of the regression line relating mean blood pressure to RR interval changes, was evaluated 18 days (n = 32), 3 months (n = 17) and 13 months (n = 10) after infarction. Baroreflex sensitivity was lower in the patients than in the control subjects (8.2 +/- 3.7 versus 12.3 +/- 2.9 ms/mm Hg, p = 0.0001). Moreover, 13 (41%) of 32 patients had a baroreflex slope less than 6.5 ms/mm Hg, which was 2 SD below the mean value of the control subjects. The internal control follow-up study showed that baroreflex sensitivity increased 3 months after infarction to values quite similar to those observed in the control subjects (11.1 +/- 5.3 versus 8.7 +/- 3.5 ms/mm Hg, p = 0.02). No further change was observed between 3 and 13 months after myocardial infarction. These data indicate that baroreflex sensitivity is lower in a proportion of postinfarction patients than in control subjects.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Schwartz PJ,Zaza A,Pala M,Locati E,Beria G,Zanchetti A

doi

10.1016/s0735-1097(88)80048-2

subject

Has Abstract

pub_date

1988-09-01 00:00:00

pages

629-36

issue

3

eissn

0735-1097

issn

1558-3597

pii

S0735-1097(88)80048-2

journal_volume

12

pub_type

杂志文章

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