Most recurrent CeAD events occur shortly after the acute first CeAD. This study was done with the purpose to compare the characteristics of recurrent and first CeAD events and searched for associations between subsequent events of an individual person.

The study sample included 76 patients who fulfilled the inclusion criteria of the study. Recurrent CeADs were occlusive in one patient, caused cerebral ischemia in 13, and were asymptomatic in 39 patients, compared to 29 occlusive, 42 ischaemic, and no asymptomatic first CeAD events. In 52 patients, recurrent dissections affected both internal carotid arteries or both vertebral arteries, whilst 24 patients had subsequent dissections in both types of the artery. 12 of 42 patients with an ischaemic first dissection had ischaemic symptoms due to the recurrent CeADs, too. However, only one of 34 patients with a non‐ischaemic first CeAD suffered ischemia upon recurrence.

The findings of this study concluded that recurrent CeAD typically affects the same site of the artery. It causes ischaemic events less often than the first CeAD. The risk that patients who presented with solely non‐ischaemic symptoms of a first CeAD will have ischaemic symptoms in the case of a recurrent CeAD seems very small.

Reference: https://onlinelibrary.wiley.com/doi/10.1111/ene.14417