MS: Mitral Valve Area (Hakki)
The Hakki formula (with subsequent correction by Angel) is a simplified formula for estimating the MVA using the average of instantaneous early, middle, and late diastolic peak-to-peak gradients across the valve.
Robert O Bonow, Blase A Carabello et al.
Oh J, Seward JB, Tajik AJ.
Hakki AH, Iskandrian AS, Bemis CE, Kimbiris D, Mintz GS, Segal BL, Brice C.
Angel J, Soler-Soler J, Anivarro I, Domingo E.