Mitral valve area by pressure half-time (native rheumatic MS) ☆ MVA = 220 / PHT. Eligibility-gated: not within 24 h of balloon valvuloplasty, not with moderate/severe AR, not in degenerative (MAC) MS, not for prosthetic valves.
Valve / clinical context — Native rheumatic MS Within 24 h of balloon valvuloplasty / commissurotomy Prior commissurotomy or valvuloplasty (>24 h) Degenerative / MAC-related obstruction Prosthetic mitral valve Aortic regurgitation — None or mild Moderate Severe Mitral regurgitation — Not significant Significant Factors altering LA/LV compliance or LV diastolic pressure (LVH, LA fibrosis, diastolic dysfunction) — Not identified Present E-wave deceleration slope — Well-defined linear slope Bimodal; mid-diastolic slope traced Bimodal; early steep slope traced Concave / not traceable Enter Mitral pressure half-time to calculate.
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