S100B Kinetic During the Occurrence and Treatment of Delayed Cerebral Ischaemia After a Subarachnoid Haemorrhage.

"5 tubes of 1 milliliters (ml) will be sampled on a catheter placed as part of the usual practice every hour for 4 hours (at Time 0, at Time 1 hour, at time 2hours, at Time 3 hours, at time 4 hours) as soon as DCI is suspected.~In the event of a mechanical angioplasty decision, the samples will be continued (Time 0, Time 2 hours, Time 4 hours, Time 6hours, Time 12 hours, Time 24 hours, so 6 samples of 1 ml)."