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Doppler waveform parvus and tardus. A sign of proximal flow obstruction
1Department of Radiology, New York Medical College, Valhalla 10595.
Abstract:
The Doppler linear flow velocity versus time spectrum obtained in an arterial flow system in which there is proximal occlusive disease with or without collateral formation has a tardus-parvus waveform. The conditions that cause this Doppler sign are due to a poststenotic pressure drop.