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Pulse‐generated runoff: A new method of determining calf vessel patency

A non‐invasive method of determining calf vessel patency before femorodistal bypass has been developed. This pulse‐generated runoff (PGR) system generates blood flow in patent calf arteries by means of a pulsatile cuff even if the existing Doppler signal is inaudible. PGR was compared with pre‐operative arteriography in 95 ischaemic limbs and both were compared with the peripheral resistance measured at operation in 62 limbs. There was a highly significant correlation between the PGR and arteriogram scores (rs = 0·74, P< <0·001) but PGR tended to detect more patent vessels than arteriography. The peripheral resistance correlated better with PGR than arteriography (rs = −0·71 and −0·54 respectively, P< <0·001). PGR is a simple, non‐invasive method of determining calf and foot vessel patency pre‐operatively.