Neurosurgery
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Cerebral arteries innervated by several systems contribute to the control of cerebral blood flow. Subarachnoid hemorrhage causes acutely developed vasospasm by various mechanical and neurochemical mechanisms, cranial parasympathetic nerve ischemia, and related stellate ganglion overdischarges. Dilatatory sensory fibers of cranial parasympathetic nerves and vasospastic fibers of stellate ganglions have a vasoregulatory effect on the cerebral arteries The aim of this study is to investigate the effect of sympathectomy on vasospasm of the middle cerebral artery. ⋯ Sympathetic blockage may be a useful effect in the prevention of cerebral vasospasm and other complications of SAH.