The Clinical Value of Transcranial Doppler Sonography in Aneurysmal Subarachnoid Hemorrhage as an Indication for Cerebral Angiography and a Means of Controlling Nimodipine Treatment

Mortality and morbidity following aneurysmal bleeding depend on recurrent hemorrhage and the occurrence of cerebral vasospasm. The pathomechanism of cerebral artery narrowing following subarachnoid hemorrhage (SAH) is not exactly known; blood decomposition products are thought to cause vessel contraction with subsequent ischemia and more or less distinct neurological deficits. Later on, changes in vessel walls similar to those seen in proliferative vessel disease may be responsible for the persistent narrowing of cerebral arteries with maintenance of the neurological deficits [5].