
Reference Manual 102
Eective Regurgitant Orice (ERO)
Reference: Oh, J.K., Seward, J.B., Tajik, A.J. The Echo Manual. Boston:Little, Brown and
Company, 1994, pp. 108-109
Vmax is the peak velocity of the mitral regurgitant jet measured on the Doppler display.
Regurgitant Volume (Vol)
Reference: Oh, J.K., Seward, J.B., Tajik, A.J. The Echo Manual. Boston:Little, Brown and
Company, 1994, pp. 108-109
Where:
PISA-Vol. = Regurgitant volume in milliliters
PISA-ERO = Eective Regurgitant area in cm2.
VTI = Velocity integral of the Regurgitant ow measured on the Doppler display
Cardiology Doppler
Mitral Valve, Tricuspid Valve
Pressure Gradient
where, V : Velocity (m/sec)
PHT ; Pressure Half Time
Reference : Oh, J.K., Seward, J.B., Tajik, A.J. The Echo Manual. Boston: Little, Brown and
Company, 1994, p.59-60
Pressure half-time (PHT) is the time it takes for the peak pressure gradient to fall to half to half
of its peak value. DT is deceleration time in centimeters per second form the peak velocity
to the baseline.
Mitral Valve area
where ; PHT is Pressure Half Time (milliseconds)
Reference : John H. Phillipse, “ Practical Quantitative Doppler Echocardiography”, p47,
chapter6, CRC press, 1991
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