Location of Left Ventricular Outflow Tract Measurements for Stroke Volume Estimation With Echocardiography

Abstract

Background: The location of the left ventricular outflow tract (LVOT) for measurement of Doppler LVOT stroke volume (SV) remains contentious. Current guidelines recommend LVOT measures at or within 5 mm to 10 mm of the aortic annulus. We aimed to determine the Doppler LVOT SV location that most closely agreed with gold standard cardiac magnetic resonance imaging (CMR). Method: This was a retrospective, single-centre, observational study of volunteer participants free of known cardiac disease, using both athlete and nonathlete controls. Participants had their Doppler LVOT SV measured using the area at the annulus, 3 mm, 6 mm, and 9 mm away from the annulus. This was compared to the gold stand..