Vleeschauwer 1987.

Methods	R ‐ sealed envelopes (not opaque or numbered) Clinical and Duplex FU blind Crossovers: none Exclusions during trial: patients with residual stenosis/occlusion (number known) Patients lost to FU: none
Participants	Germany 126 patients 174 operations 60% male Mean age: 64 years 30% asymptomatic carotid disease Comparability: age, sex, vascular risk factors, % asymptomatic disease not reported by treatment group
Interventions	Rx: autologous vein patch Control: primary closure Routine shunting for all Postoperative aspirin (1 g) for all
Outcomes	Death < 30 days and end of FU Stroke < 30 days and end of FU Wound haemorrhage, infection Restensosis > 50% or occlusion at end of FU (Duplex)
Notes	Ex: Recurrent stenosis, kinked ICA FU: 1 year
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	High risk	C ‐ Inadequate

CABG: coronary artery bypass graft 
 DSA: digital subtraction angiography 
 Ex: exclusion criteria 
 FU: follow up 
 GA: general anaesthesia 
 ICA: internal carotid artery 
 R: concealment of allocation 
 RIND: reversible ischaemic neurological deficit 
 Rx: treatment 
 TIA: transient ischaemic attack