Radiology Contrast Agents d698c0ac All are features of a normal venous doppler except? A Triphasic pattern B Flow Ceases with Valsalva C Flow Augmentation with Distal Compression D Compressibility High-Yield Explanation Normal Venous doppler is Monophasic with Respiratory and Cardiac Phasicity. High Resistance Peripheral Aeries show a Triphasic pattern.