| Effects of captopril on forearm oxygen consumption during dynamic handgrip exercise in patients with congestive heart failure. | |
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MedLine Citation:
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PMID: 2084278 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The maximal exercise capacity of patients with congestive heart failure (CHF) is frequently decreased because of decreased skeletal muscle oxygen utilization. In this study we examined whether forearm oxygen utilization is decreased during dynamic handgrip exercise in patients with CHF and whether captopril improves forearm oxygen utilization. They were divided into 3 groups according to the level of plasma renin activity (PRA) and New York Heart Association functional classification (NYHA): Group 1 consisted of 7 normal (control) subjects (PRA: 0.5 +/- 0.2 ng/ml/h, NYHA: 0); Group 2, 7 patients with severe CHF (PRA: 11.3 +/- 3.9 ng/ml/h, NYHA: 3.6 +/- 0.3); Group 3, 4 patients with mild CHF (PRA: 2.4 +/- 0.2 ng/ml/h, NYHA: 2 +/- 0). Forearm blood flow was measured by a strain gauge plethysmograph at rest and during dynamic handgrip exercise. Regional arterial venous oxygen content was measured and forearm oxygen consumption was calculated by the Fick principle. Forearm blood flow was less (p less than 0.05) at rest and during exercise in patients with severe CHF than in control subjects; this was compensated for by increased oxygen extraction, thus maintaining forearm oxygen consumption at a normal level at rest and during submaximal exercise. During maximal exercise, oxygen extraction was not different between normal control subjects and patients with severe CHF, thus forearm oxygen consumption was significantly less (p less than 0.01) in patients with severe CHF than in control subjects. In patients with mild CHF, forearm blood flow, oxygen extraction and oxygen consumption were not different from those in normal control subjects. Captopril (25 mg orally) did not alter forearm hemodynamics at rest and during exercise in control subjects and patients with mild CHF. In patients with severe CHF, captopril lowered systolic and mean blood pressure (p less than 0.05). Captopril increased forearm oxygen extraction (p less than 0.05) and tended to increase blood flow and thus increased oxygen consumption (p less than 0.01) during maximal exercise. Our data indicate that oxygen utilization was impaired in patients with severe CHF and that captopril improved forearm oxygen utilization during maximal handgrip exercise in patients with severe CHF. |
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Authors:
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T Imaizumi; A Takeshita; N Nakamura; K Sakai; Y Hirooka; S Suzuki; M Yoshida; M Nakamura |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Japanese heart journal Volume: 31 ISSN: 0021-4868 ISO Abbreviation: Jpn Heart J Publication Date: 1990 Nov |
Date Detail:
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Created Date: 1991-05-14 Completed Date: 1991-05-14 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0401175 Medline TA: Jpn Heart J Country: JAPAN |
Other Details:
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Languages: eng Pagination: 817-28 Citation Subset: IM; S |
Affiliation:
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Cardiovascular Clinic, Faculty of Medicine, Kyushu University, Fukuoka, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Blood Pressure
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drug effects Captopril / pharmacology, therapeutic use* Forearm / blood supply* Heart Failure / drug therapy, physiopathology* Heart Rate / drug effects Humans Middle Aged Oxygen Consumption / drug effects* Physical Exertion* Regional Blood Flow / drug effects Renin-Angiotensin System / drug effects Vascular Resistance / drug effects |
| Chemical | |
Reg. No./Substance:
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62571-86-2/Captopril |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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