Step 1: Obtain a Continuous Wave Doppler flow profile of the mitral valve. Trace the flow profile. The traced flow profile has a mean velocity, Vmean. The square of the Vmean multiplied by 4 will yield the mitral valve gradient.
Note: All gradients are sensitive to the amount of flow thru the valve. While changes in cardiac output will affect the gradient of the aortic valve, the flow thru the mitral valve is dependent upon atrial factors. Any degradation of atrial function (i.e. normal sinus rhythm converting to atrial fibrillation) will falsely decrease the gradient across the mitral valve.
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.