[Methods of determination of stroke volume from M-mode echocardiogram of the aortic valve and aortic root. A...

The purpose of this study is to evaluate four methods of determining left ventricular stroke volume (SV) from aortic valve (AV) and aortic root (AR) M-mode echocardiogram (Table I, formulas 1-4); secondly, to study relations between echocardiographic aortic variables and SV. We studied 20 patients (Pts) in our Coronary Unit, 14 men and 6 women; their ages ranged from 38 to 76 (mean 53.4) years. Seventeen Pts had acute myocardial infarction; two Pts had previous myocardial infarction and heart failure; one Pt had dilated cardiomyopathy and heart failure. Three out of the twenty Pts, had mitral insufficiency (Table II, clinical and hemodynamic data). Patients were studied with high quality M-mode echocardiography. Immediately after the examination repeated measurements of cardiac output by thermodilution technique (TD) were carried out, and values of SV calculated (SV-TD). Twenty-five complete procedures were accomplished. The formulas were applied to every patient's echocardiographic data, and results (SV-ECHO) compared with SV-TD (Table III). Echocardiographic variables, whether single or multiple (terms), were also studied with regard to their relation with SV-TD (Table IV). Mean +/- SD value of SV-TD of the study group was 60.3 +/- 24.7 ml; range 22.7 to 108 ml. Mean +/- SD values of SV-ECHO were as follows: Yeh's formula, based on squared mean AV opening and LVET, 56 +/- 22.6 (ml), r = 0.8278, SEE 12.98; Jacobs' formula, based on aortic box planimetry, 68 +/- 32.5 (ml), r = 0.7129, SEE 23.31.(ABSTRACT TRUNCATED AT 250 WORDS)