What RI value suggests hepatic artery stenosis?

RI <0.5 post-transplant with tardus parvus waveform suggests hepatic artery stenosis. Thrombosis shows absent or reversed end-diastolic flow. RI <0.5 has 87% sensitivity for HAT.

Normal hepatic artery RI range?

Normal: 0.55–0.75. Values below 0.5 suggest inflow obstruction (stenosis). Values above 0.8 may indicate severe graft edema, rejection, or biliary obstruction.

How often is Doppler performed post-transplant?

Protocol Doppler at 6, 12, 24, and 48 hours post-transplant. Weekly for first month, then as clinically indicated. Immediately if rising LFTs or clinical deterioration.

Hepatic Artery Resistance Index Calculator

Calculate hepatic artery resistance index (RI) from Doppler waveform: RI = (Peak Systolic Velocity − End Diastolic Velocity) / Peak Systolic Velocity. Normal 0.55–0.75. Post-transplant monitoring tool.

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Frequently Asked Questions

What RI value suggests hepatic artery stenosis?

Normal hepatic artery RI range?

How often is Doppler performed post-transplant?