The Optimal Dose of Mannitol for Intraoperative Brain Relaxation During the Operation of Aneurysmal Subarachnoid Hemorrhage

When the neurosurgeon starts the skin incision, 20% mannitol administered through the venous catheter with fulldrip in 5-10 minutes. Neurosurgeons evaluate the degree of brain relaxation after dura opening in 4 point scale (1=bulging brain, 2=firm brain, 3=satisfactorily relaxed, 4=perfectly relaxed).