Fully automatic, noninvasive measurement of cardiac output by means of the CO2 rebreathing method and its clinical application to hypertensive patients.
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概要
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A new device (called a hemodynamometer) employing the principle of the CO2 rebreathing method has been developed for the noninvasive automatic measurement of pulmonary blood flow (cardiac output=CO). The device can also measure oxygen consumption (VO2) and indirect blood pressure and record electrocardiographs (heart rate) at the same time and can automatically calculate total peripheral vascular resistance (TPR) by means of a computer. In this study, the hemodynamometer was used in 28 normotensive subjects and 42 patients with essential hypertension (27 with WHO stage I and 15 with WHO stage II) to evaluate hemodynamics during rest or ergometer exercise. To evaluate accuracy, the dye-dilution (cuvette) method was simultaneously employed in some subjects. The correlation coefficient (r) between CO measured by means of the hemodynamometer and CO measured by the cuvette method was 0.96 (n=39) with a differential of 0.08±0.53l/min and reproducibility was good (r=0.88, n=70). The average CO index for normotensive subjects at rest was 3.22±0.37l/min/m2 (VO2=210±30ml/min/m2) and agreed with previously reported values. A significant difference was observed between the hemodynamics (CO and TPR indices) of the WHO-I group and those of the WHO-II group during rest or mild exercise (25-watt load).Because it can measure CO and TPR easily and noninvasively, the hemodynamometer is considered useful for evaluating hemodynamic changes in hypertensive patients.
- International Heart Journal刊行会の論文
著者
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Kuji Naomitsu
Second Department of Internal Medicine, Yokohama City University
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Minamisawa Kohsuke
Second Department Of Internal Medicine Yokohama City University School Of Medicine
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Ishii Masao
Second Department Of Internaal Medicine Yokohama City University
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Miyajima Eiji
Second Department Of Internal Medicine School Of Medicine Yokohama City University
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Tochikubo Osamu
Second Department Of Internaal Medicine Yokohama City University
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NAKAMURA Youhei
Nihon Denki-Sanei Co., Ltd.
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SAITOH Junichi
Nihon Denki-Sanei Co., Ltd.
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MIYAJIMA Eiji
Second Department of Internal Medicine, Yokohama City University School of Medicine
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KUJI Naomitsu
Second Department of Internal Medicine, Yokohama City University School of Medicine
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