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Mitral Valve Area by Pressure Half-Time (PHT)
Calcs>Mitral Stenosis>MVA by PHT>1
to get an MVA by PHT.
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 velocity equal to Vmax
divided by 1.4 is the pressure half time. (Vmax
/ 1.4 is equivalent to the half pressure). 220
divided by the PHT is the mitral valve area.
This activity has been planned and implemented in accordance with the accreditation requirements and policies of the Accreditation Council for Continuing Medical Education through the joint providership of University of Nebraska Medical Center, Center for Continuing Education and JLS Interactive, LLC.
The University of Nebraska Medical Center, Center for Continuing Education is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians.
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.