HEPATIC ARTERY DOPPLER INDICES:

HEPATIC ARTERY DOPPLER INDICES:

DEFINATION:

Hepatic Artery Resistive Index: (HARI): Peak systolic velocity minus end-diastolic velocity divided by the peak systolic velocity.

The Early Systolic Acceleration (ESA) in the hepatic artery is the slope of tangent of the initial systolic upsweep of the arterial waveform i.e. duration of upstroke from end-diastolic to peak systole, measured using calipers. The time corresponding to ESA was computed and this was referred to as the Hepatic Artery Acceleration Time (HAAT) in sec. The Value used in this study was obtained by taking an average of three measurements.

The Hepatic Artery Acceleration Index (HAAI) is the ratio between the acceleration of the Doppler special waveform and the relative peak systolic velocity. The systolic acceleration was calculated as a change in the distance between the beginning of systolic flow and the peak systolic velocity (cm/sec), divided by the acceleration time. The acceleration index is expressed in frequency units as KHz/sec or in velocity units as cm/sec^{2 .}

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