運動負荷における肺循環動態の変動
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Essential hypertension or coronary sclerosis can result in heart failure through ischemic damage of the heart. It is, therefore, very significant to judge the extent of the impairment in cardiac function in these diseases before heart failure becomes manifest. For this purpose, phasic analysis of the events occurring during cardiac contraction was made by polygraphic tracing. In order to see the relationship between the alteration in individual contraction phases and cardiac function, average values in these diseases, patients with manifest heart failure and normal subjects were compared with each other. Correlations between cardiac contraction phases and the time course of the dye-dilution curve or findings of the chest roentgenogram were also examined. It has been stated that each phase of cardiac contraction is closely related to the length of the preceding cardiac cycle. So, this influence of the preceding cardiac cycle length (R-R interval in E.C.G.) on events of cardiac contraction was examined in the atrial fibrillation. A. Analysis of Phases of Events during Cardiac Contraction by Polygraphy. MATERIAL AND METHODS Thirteen cases of manifest heart fhilure due to essential hypertension or coronary sclerosis, 17 cases of coronary sclerosis, 39 cases of coronary sclerosis with hypertension and 86 cases of essential hypertension without coronary sclerosis were examined. Existence of coronary sclerosis was determined by electrocardiographic findings. For control, 32 healthy subjects were also examined. All subjects examined had sinus rhythm. The polygram consisted of the 2nd limb lead of E.C.G., phonocardiogram from the apex area and external carotid pulse.. From the polygram, Q-I interval, isometric phase proper, stretching time, ejection time and mechanical systole were determined and the calculation of mechanical quotient and JEZEK'S index were made. Among them, ejection time and mechanical systole were corrected for heart rate using the BAZETT formula dividing the absolute value by the square root of the preceding cycle length (R-R interval).
- 社団法人日本循環器学会の論文
- 1965-12-20
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- 運動負荷における肺循環動態の変動