The pressure half-time index is the time it takes for the ... the regurgitant orifice (in the case of aortic regurgitation, the aortic valve). (Zoghbi WA, et al. J Am Soc Echocardiogr.

As your heart beats, it pumps blood from the left ventricle through the aortic valve and into the aorta, your body’s largest artery. The aortic valve is made up of three triangular flaps of ...

Aortic stenosis occurs when the orifice of the aortic valve is significantly ... be determined at the same time. The difference between these two pressures is the pressure gradient.

Calculation of Mitral Valve Area in Mitral Stenosis: Comparison of Continuity Equation and Pressure Half Time With Two-Dimensional Planimetry in Patients With and Without Associated Aortic or ...