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Intra-operative hepatic artery vasospasm. A: Intra-operative Doppler US image showing high resistance flow in the HA with low diastolic flow and normal systolic upstroke; B: Doppler US image of the HA after intra-operative papaverine installation showing relief of spasm, regaining the normal biphasic Doppler waveform, and a continuous diastolic flow throughout the cardiac cycle. HA: Hepatic artery.
