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Mitral Valve Area by Deceleration Time (DT)
Calcs>Mitral Stenosis>MVA by DT>1
to get an MVA BY DT.
1: Obtain a PWD or a CWD of the mitral valve.
The flow profile of the mitral valve will have a Vmax,
typically the maximum velocity of the E wave.
The time from the Vmax to the where the velocity is
equal to zero is the deceleration time. Typically,
the curve will have to be extrapolated to the zero
velocity. The mitral valve area is equal to
759 divided by the deceleration time.
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This activity is approved by the American Society of Radiologic Technologists (ASRT) as sonography-related continuing education (CE). Credit(s) issued for successful completion of ASRT-approved CE activities are accepted by the American Registry of Diagnostic Medical Sonography, American Registry of Radiological Technologists, Cardiovascular Credentialing International and Canadian Association of Registered Diagnostic Ultrasound Professionals. Contact the applicable registry for additional information / restrictions on their acceptance of ASRT CE credit.