What can falsely elevate the MR velocity?

What can falsely elevate the MR velocity?

• A. Systemic Hypertension
• B. Severe Aortic Stenosis
• C. LVOT Obstruction
• D. All of the Above

Answer: (D)

MR velocity reflects the pressure gradient between the left ventricle and left atrium during systole. Any factor that increases LV systolic pressure or the LV–LA gradient will raise the Doppler jet velocity, even if the regurgitant orifice size hasn’t changed. Systemic hypertension raises afterload, pushing LV systolic pressure higher and increasing the LV–LA gradient, which elevates the MR velocity. Severe aortic stenosis makes the LV generate higher systolic pressure to push blood through a narrowed aortic valve, again boosting the gradient and the MR velocity. LVOT obstruction acts similarly by increasing afterload and LV systolic pressure, raising the gradient across the mitral valve during systole. Because the Doppler-measured MR velocity hinges on this gradient, all these conditions can falsely elevate the velocity reading, potentially exaggerating perceived MR severity unless the LV pressure context is considered.

MR velocity reflects the pressure gradient between the left ventricle and left atrium during systole. Any factor that increases LV systolic pressure or the LV–LA gradient will raise the Doppler jet velocity, even if the regurgitant orifice size hasn’t changed.

Systemic hypertension raises afterload, pushing LV systolic pressure higher and increasing the LV–LA gradient, which elevates the MR velocity. Severe aortic stenosis makes the LV generate higher systolic pressure to push blood through a narrowed aortic valve, again boosting the gradient and the MR velocity. LVOT obstruction acts similarly by increasing afterload and LV systolic pressure, raising the gradient across the mitral valve during systole.

Because the Doppler-measured MR velocity hinges on this gradient, all these conditions can falsely elevate the velocity reading, potentially exaggerating perceived MR severity unless the LV pressure context is considered.