Stroke volume estimated at aortic root in M-mode echocardiography.
A noninvasive method for the determination of stroke volume which can be applicable even to a heart contracting asymmetrically is desired. The momentum of blood ejected from heart will be divided into 2 forms; the one is that of blood running away distally and the other is the momentum of the aortic root. SV is estimated by an equation; SVa0 = kXD2XVao1/2XAOT, where D is the diameter of the aortic root, Vao is the mean velocity of the systolic movement of anterior wall, and AOT is the duration of the valve opening of the aortic leaflets. A good correlation was found between SVao and SV measured by the thermodilution method (r = 0.85, p less than 0.001). Since the parameters used in the present method are not affected directly by the mode of cardiac contraction; symmetrical or asymmetrical, it may be useful to determine SV in man.
D000328:Adult; D000368:Aged; D001011:Aorta / Q000502:physiology; D002302:Cardiac Output; D004452:Echocardiography; D006801:Humans; D008722:Methods; D008875:Middle Aged; D009200:Myocardial Contraction; D013318:Stroke Volume; D013815:Thermodilution