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#Cardiotwitter. Seems that the interest in the #mitral_annular_dynamics during pre ejection would justify a continuation.
1/ Firstly, I’ll return to the protosystolic peak velocity, it’s occurring before MVC. Thus there is no such animal as peak isovolumetric velocity or acceleration. But does it matter, what we call it, and what does the peak protosystolic velocity mean physiologically? 
2/ It is the peak velocity of longitudinal shortening before MVC. At this point, the load is low (= LA pressure), so it is related to the velocity of unloaded shortening. But this occurs before peak rate of force development, and is not a contractility measure.
