Lord 1989.

Methods	R = sealed envelopes (artery randomised) Probably neither duplex nor clinical FU blind Crossovers: 4 (unclear which group these were in) Exclusions during trial: 4 crossovers Patients lost to FU: none
Participants	Australia 123 patients 140 operations. 62% male Mean age: 63 years % asymptomatic carotid disease unknown Comparability: age, sex, vascular risk factors, % symptomatic disease similar in each group
Interventions	Rx: saphenous vein patch or polytetrafluoroethylene patch (random allocation) Control: primary closure 17% shunted Postoperative aspirin for all
Outcomes	Ipsilateral stroke < 30 days Perioperative occlusion (intravenous DSA) Wound haemorrhage
Notes	Ex: unknown FU: until hospital discharge
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Low risk	A ‐ Adequate