Abstract
Noninvasive stroke volume determination by Doppler echocardiography has traditionally required estimation both of mean flow rate during ejection by Doppler methods and of flow area by cross-sectional or M-mode echocardiography. 1 Spodick and Koito 2 recently reported a method for estimating stroke volume from Doppler echocardiographic tracings alone, which they term non-geometric because no area measurement is used. Instead, mean left ventricular ejection rate is estimated from mean Doppler velocity and is then multiplied by Doppler ejection time to yield stroke volume. We reasoned that if there is a physiologic relation between ejection rate and Doppler velocity, truly independent of aortic size, the nongeometric method should also accurately estimate stroke volume in infants and children, who have a wide range of aortic size.
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