Increased Exhaled Nitric Oxide and Impaired Oxygen Uptake (VO_2) Kinetics During Exercise in Patients With Chronic Heart Failure
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概要
- 論文の詳細を見る
Vascular endothelial function is abnormal in patients with congestive heart failure (CHF). Exhaled nitric oxide (NO) output is a marker of pulmonary endothelial NO release. The present study examined the relation between exhaled NO output and oxygen uptake (VO_2) kinetics at the onset of exercise, which reflects blood flow response. Sixteen patients with CHF and 7 volunteers underwent constant bicycle exercise. Oxygen deficit and time constant for VO_2 increment at the onset of exercise were analyzed. Exhaled NO concentration was measured by a chemiluminescence analyzer and exhaled NO output was calculated by multiplexing ventilation. Exhaled NO output was significantly greater in the CHF group than in the control group at rest (86±65 nl min^<-1> m^<-2> vs 298±135 nl min^<-1> m^<-2>, p<0.001) and during exercise (152±98 nl min^<-1> m^<-2> vs 455±190 nl min^<-1> m^<-2>, p<0.001). However, the %increase of NO output was significantly smaller in the CHF group than in the control group (70±26% vs 109±85%, p<0.05). Oxygen deficit was significantly greater in the CHF group than in the control group (240±70 ml vs 372±107 ml, p<0.01) and the time constant for VO_2 increment was also significantly prolonged in the CHF group (35.1±8.0s vs 50.1±16.3s, p<0.05). Exhaled NO output during exercise significantly correlated with oxygen deficit (r=0.67, p<0.001) and the time constant for VO_2 increment (r=0.74, p<0.001). Increased NO output played a counter-regulatory role in the impaired blood flow in CHF.
- 社団法人日本循環器学会の論文
- 1999-03-20
著者
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Yokoyama Mitsuhiro
The First Department of Internal Medicine, Kobe University School of Medicine
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Yamabe Hiroshi
The First Department Of Internal Medicine Kobe University School Of Medicine
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Yokoyama Mitsuhiro
The First Department Of Internal Medicine Kobe University School Of Medicine
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Funakoshi Takahiro
The First Department of Internal Medicine, Kobe University School of Medicine
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Yokoyama Mitsuhiro
The First Department Of In Internal Medicine Kobe University School Of Medicine
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Funakoshi Takahiro
The First Department Of Internal Medicine Kobe University School Of Medicine
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