Improved Oxygen Utilization During Mild Exercise in Heart Failure
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概要
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In heart failure with low cardiac output, exercise tolerance is reduced despite modulated regional blood distribution and oxygen extraction. However, low cardiac output does not necessarily lead to reduced exercise tolerance especially during mild exercise. In the present study, in order to understand the mechanisms regulating exercise tolerance in heart failure, we measured oxygen consumption(VO_2)and cardiac output(CO)during both mild and intense exercise. Patients with heart failure were divided into 2 groups ; group L(n=8)consists of patients with low anaerobic threshold(AT)<13ml/min per kg and group H(n=7)consisting of patients with AT>13ml/min per kg. At rest, VO_2 was similar between groups L and H, whereas CO was lower in group L than in group H(3.5+0.3 vs 4.8+1.4ml/min, p<0.01). Increase in VO_2 during warm-up exercise was not significant between the 2 groups(7.4±0.5(group L)vs 6.2±0.3ml/min per kg(group H), ns), but increase in CO was lower in group L than in group H(2.5±0.6 vs 3.4±0.4ml/min, p<0.01). After warm-up to the AT point, however, the increase in not only VO_2 but also CO was markedly reduced in group L than in group H(VO_2 : 0.5±0.4 vs 3.7±0.8ml/min per kg, p<0.01, CO : 0.2±0.3 vs 1.1±0.3L/min, p<0.01). Based on these measurements, we calculated the arteriovenous oxygen difference (c(A-V)O_2 difference)during exercise in individual patients using Fick's equation. The c(A-V)O_2 difference was markedly increased in severe heart failure during the warm-up stage, but between the end of warm-up and the AT point, it remained at the same level as that of group H. These results suggest the presence of a unique mechanism regulating the c(A-V)O_2 difference in severe heart failure patients, activation of which may, at least during mild exercise, contribute to efficient oxygen delivery to the peripheral tissues thus compensating for the jeopardized exercise tolerance in those patients.
- 社団法人日本循環器学会の論文
- 1998-09-20
著者
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HASEGAWA Akira
The Second Department of Internal Medicine,Gunma University School of Medicine
-
Oshima Shigeru
Gunma Prefectural Cardiovascular Center
-
Itoh Haruki
Akita University School Of Medicine
-
Itoh Haruki
The Cardiovascular Institute Hospital
-
IIMURA Hiroyuki
The Cardiovascular Institute
-
NAGAI Ryozo
the Second Department of Internal Medicine, Gunma University School of Medicine
-
Adachi Hitoshi
Gunma Prefectural Cardiovascular Center
-
Taniguchi Koichi
Gunma Prefectural Cardiovascular Center
-
Hasegawa Akira
群馬大学 医学系研究科臓器病態内科学
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Hasegawa Akira
Department Of Medicine And Biological Science Gunma University Graduate School Of Medicine
-
Itoh Haruki
聖マリアンナ医科大学 内科学循環器
-
Itoh Haruki
The Cardiovascular Institute
-
Itoh Haruki
Cardiovascular Institute
-
Nagai Ryozo
Department Of Cardiovascular Medicine Tokyo University Graduate School Of Medicine
-
Itoh Haruki
Int. Medicine Yokosuka Mutual Aid Hospital.
-
Ohshima Shigeru
Gunma Prefectural Cardiovascular Center
-
Tanehata Masaaki
The Second Department of Internal Medicine, Gunma University School of Medicine
-
Hasegawa Akira
Department Of Medicine And Biological Science Graduate School Of Medicine Gunma University
-
Itoh Haruki
Second Department Of Internal Medicine Tokyo Medical And Dental University
-
Tanehata Masaaki
Division Of Heart Failure And Cardiac Rehabilitation Gunma Prefectural Cardiovascular Center
-
Ito Hiroshi
Second Department Of Internal Medicine Tokyo Medical And Dental University
-
Ito Hiroshi
Akita University School Of Medicine
-
Hasegawa Akira
The Second Department Of Internal Medicine And The Department Of Hygiene Gunma University School Of
-
Nagai Ryozo
The Second Department Of Internal Medicine Gunma University
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