Arterial collateral anatomy predicts the risk for intra-operative changes in somatosensory evoked potentials in patients undergoing carotid endarterectomy: a prospective cohort study.

Assessing the configuration of the circle of Willis, missing segments of the anterior circulation (missing ipsilateral or contralateral A1 segment and/or missing Acom) showed a trend towards a significantly increased risk of a decline in intra-operative SEPs >0.5 without reaching the pre-defined level of statistical significance (OR 4.5, 95% CI 0.93–21.71, p = 0.061).

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