Upper extremity arm pressures

The arm blood pressures are unequal with the left radial artery pressure 35 mmHg lower than the right. The left radial wrist-brachial index is abnormal, consistent with left upper extremity occlusive disease.
The arterial waveforms in the right and left subclavian, axillary, and brachial arteries are normal. The right radial artery waveform is normal, but the right ulnar artery waveform is monophasic indicating abnormal flow. The left radial artery waveform is also monophasic, and the waveform in the left ulnar artery is flat indicating no flow. Together with the unequal arm pressures, these waveforms indicate left forearm arterial occlusive disease.