ABI/TBI with segmental PVR waveforms
Lower Extremity Macro Circulation
Ankle-Brachial Index (ABI) / Pulse Volume Recording (PVR)
The ankle-brachial index (ABI) is the ratio of the blood pressure at the ankle to the blood pressure in the upper arm (brachium). Compared to the arm, lower blood pressure in the leg is an indication of blocked arteries due to peripheral artery disease (PAD). A toe-brachial index (TBI) is when a ratio is calculated between the toe pressure and the higher brachial pressure. While an ABI/TBI is a useful tool, as a stand-alone, it can have limitations, especially in diabetic patients with calcified vessels. Coupling the ABI/TBI with a pulse volume recording (PVR) gives a more complete picture of the lower extremity macro circulation. Pulse volume recording, also known as plethysmography, is a noninvasive test that measures blood flow within the blood vessels, or arteries. Its purpose is to help locate blockages in the arteries. Physicians usually perform pulse volume recording on the legs to help diagnose leg artery disease.