Left atrial pressure (LAP) can be estimated by measuring the systolic blood pressure and the maximum mitral regurgitation velocity by spectral Doppler provided that there is no significant gradient across the aortic valve.
SBP - 4 (MR VMax)2
Maximum mitral regurgitation velocity (m/sec)
Systolic Blood Pressure (mmHg)
Left Atrial Pressure (mmHg)
Gorcscan J, et al. Noninvasive estimation of left atrial pressure in patients with congestive heart failure and mitral regurgitation by Doppler echocardiography. Am Heart J., 121:858, 1991.
Nishimura RA, et al. Determination of left-sided pressure gradients by utilizing Doppler aortic and mitral regurgitant signals: validation by simultaneous dual catheter and Doppler studies. JACC 11:317, 1988.
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