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Figure 2 Method for determination of specific aortic elastance by transthoracic echocardiography: Wave front propagation time from the left ventricular outflow tract to the common femoral artery is measured using pulsed wave Doppler. The wave front is defined as the extrapolation of the first segment of the Doppler flow profile to the baseline. Average aortic diameter is determined from measurements in the ascending aorta, the aortic arch and the abdominal aorta. All measurements are made using a conventional echocardiograph.