title: Doppler waveform parvus and tardus. A sign of proximal flow obstruction.
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.
authors.affiliation: Department of Radiology, New York Medical College, Valhalla 10595.
authors.forename: P S
authors.initials: PS
authors.lastname: Kotval
mesh_terms: D001157:Arterial Occlusive Diseases / Q000175:diagnosis*; D001794:Blood Pressure; D002561:Cerebrovascular Disorders / Q000175:diagnosis*; D003097:Collateral Circulation; D006801:Humans; D011673:Pulsatile Flow; D014465:Ultrasonics; D014463:Ultrasonography