Criteria for conservative treatment of supratentorial acute subdural haematomas.

Without mortality, 31 patients underwent conservative treatment for traumatic supratentorial acute subdural haematoma (SDH). Later on six of them had the haematoma surgically evacuated mainly because of a deterioration of the Glasgow Coma Scale (GCS) scores. It was found that patients with a midline shift of less than 10 mm on the computed tomography (CT) scans and with a GCS score of 15 initially might be treated conservatively under close observation, reserving urgent craniotomy and evacuation of the SDH for those with deteriorating neurological conditions. A smaller degree of midline shift was tolerated by patients with an GCS score of less than 15: a shift of more than 5 mm on the initial CT scans predicted an exhaustion of the cerebral compensatory mechanism within 3 days of injury. In such cases the GCS score worsened, and surgical evacuation of the SDH became necessary. A total hospital stay of 6 to 7 days may suffice for those who have become fully conscious. Repeat CT studies before discharge should be done and a close follow-up during the first 3 to 4 weeks is advisable.