Pulse-generated runoff: a new method of determining calf vessel patency

Area of Science:

• Vascular Surgery
• Medical Imaging
• Diagnostic Techniques

Background:

• Assessing calf vessel patency is crucial for successful femorodistal bypass.
• Traditional methods like Doppler ultrasound may have limitations in detecting all patent vessels.
• Pre-operative imaging is essential for planning bypass surgery in ischemic limbs.

Purpose of the Study:

• To introduce and evaluate a novel non-invasive method, Pulse-Generated Runoff (PGR), for determining calf vessel patency.
• To compare the efficacy of PGR with pre-operative arteriography and intra-operative peripheral resistance measurements.
• To establish PGR as a reliable tool for pre-operative assessment in patients undergoing femorodistal bypass.

Main Methods:

• Developed a Pulse-Generated Runoff (PGR) system utilizing a pulsatile cuff to generate blood flow in calf arteries.
• Compared PGR results with pre-operative arteriography in 95 ischemic limbs.
• Correlated both PGR and arteriography findings with peripheral resistance measurements obtained during surgery in 62 limbs.

Main Results:

• A highly significant correlation was observed between PGR scores and arteriogram scores (rs = 0.74, P < 0.001).
• PGR identified more patent calf vessels compared to pre-operative arteriography.
• Peripheral resistance showed a stronger correlation with PGR (rs = -0.71) than with arteriography (rs = -0.54).

Conclusions:

• Pulse-Generated Runoff (PGR) is a simple and effective non-invasive method for assessing pre-operative calf and foot vessel patency.
• PGR offers a valuable alternative or adjunct to traditional imaging techniques for surgical planning.
• The PGR system demonstrates high accuracy and sensitivity in detecting patent vessels crucial for bypass surgery.