Relationship between the diameter of the vein graft and postoperative ankle brachial pressure index following femoro-popliteal bypass.

AIM

We studied whether the diameter of the saphenous vein graft affects the result of femoro-popliteal bypass surgery.

METHODS

Thirty-eight patients with bypasses from the femoral artery to the above knee popliteal artery were studied. Bypasses without a patent anterior or posterior tibial artery were excluded. The great saphenous vein was used as a bypass graft in 20 extremities and Dacron grafts (6 mm or 8 mm diameter) were used in 18 arteries. The smallest diameter of the saphenous vein was measured preoperatively with ultrasonography. Vein grafts were divided into two groups: small vein graft (< or =3 mm) and large vein graft (> or =3.5 mm). The ankle brachial pressure index (ABI) was measured at 1 week and 3 months after operation.

RESULTS

The diameter of the vein graft (2.5 to 4 mm, 3.4+/-0.5 mm) was positively correlated with postoperative ABI (R2 0.607, P<0.0001). The postoperative ABI at 1 week was significantly lower in the small vein graft group (0.72+/-0.09) than in the large vein graft group (0.95+/-0.11) and in the Dacron graft group (1.05+/-0.16). The ABI at 3 months was still significantly lower in small vein graft group (0.78+/-0.07).

CONCLUSION

The diameter of the vein graft was positively correlated with postoperative ABI after femoro-popliteal above knee bypass. Postoperative ABI was lower using a vein graft with a diameter of < or =3 mm than that using a bigger vein graft or a Dacron graft.