The injection of autologous blood Blood Patch (BP) into the epidural space is the standard
treatment for headache associated with intracranial hypotension. It provokes cerebral
vasoconstriction. It is cons-indicated in a number of situations (HIV positive, fever,
sepsis, leukemia). The purpose of this study is to evaluate another technique using a patch
made by injecting an epidural hydroxyethylstarch solution (HES 130, 0.4, 6%) instead of blood
patch. This alternative technique is simple to implement and does not have some of the
specific blood pressure contra-indications. The study aims at comparing the "Blood Patch"
group versus the "HES Patch" in terms of clinical efficacy , tolerance, satisfaction of the
anesthetist, ease of implementation and effect of the injection of epidural anesthesia on
cerebral blood flow within 24 hours.