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100

101

Reference Manual 92

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 = Eective 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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