| Cardiopulmonary receptor and arterial baroreceptor reflexes after acute myocardial infarction. | |
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MedLine Citation:
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PMID: 1550015 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The baroreceptor-heart rate reflex in human is impaired 2 days after a myocardial infarction but it improves 10 days after the acute coronary event. This study investigated whether (1) the baroreceptor-heart rate reflex improvement takes the reflex back to normal, and (2) the cardiopulmonary reflex is affected by myocardial infarction. In subjects studied 8 to 11 days after a transmural anterior or inferior myocardial infarction the baroreceptor-heart rate reflex sensitivity (slope of the linear regression between negative neck chamber pressures and lengthenings in RR interval) was similar to that seen in control subjects (-6.2 +/- 0.8 vs -6.0 +/- 0.6 ms/mm Hg, mean +/- SEM) and did not change when reassessed 10 days later. In contrast, the cardiopulmonary reflex sensitivity (changes in forearm vascular resistance induced by changing central venous pressure through nonhypotensive lower body suction and leg raising) was markedly less in subjects studied 8 to 11 days after myocardial infarction than in control subjects; the reduction amounted to 58.1 +/- 8% (p less than 0.01). The cardiopulmonary reflex sensitivity greatly improved when reassessed 28 to 45 days later. Thus, the baroreflex is normal about 10 days after myocardial infarction. This condition markedly impairs the cardiopulmonary reflex, but the impairment is also transient. |
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Authors:
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G Grassi; C Giannattasio; G Seravalle; G Osculati; F Valagussa; A Zanchetti; G Mancia |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The American journal of cardiology Volume: 69 ISSN: 0002-9149 ISO Abbreviation: Am. J. Cardiol. Publication Date: 1992 Apr |
Date Detail:
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Created Date: 1992-04-17 Completed Date: 1992-04-17 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 0207277 Medline TA: Am J Cardiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 873-8 Citation Subset: AIM; IM; S |
Affiliation:
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Clinica Medica Generale, Università di Milano, Italy. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Blood Pressure* Carotid Sinus Central Venous Pressure Exercise Female Heart Rate* Humans Linear Models Lower Body Negative Pressure Male Myocardial Infarction / physiopathology* Pressoreceptors / physiopathology* Reflex* Time Factors |
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