Mitral Valve Gradient

Mitral valve gradient:
Mitral valve gradient
Formula:AVG = 4 x (Vmean)²

How to get an MVG.

  1. Obtain a Continuous Wave Doppler flow profile of the mitral valve. Trace the flow profile. The traced flow profile has a mean velocity, Vmean. The square of the Vmean multiplied by 4 will yield the mitral valve gradient.

All gradients are sensitive to the amount of flow thru the valve. While changes in cardiac output will affect the gradient of the aortic valve, the flow thru the mitral valve is dependent upon atrial factors. Any degradation of atrial function (i.e. normal sinus rhythm converting to atrial fibrillation) will falsely decrease the gradient across the mitral valve.