Cerebral vasospasm is one of the complications caused by subarachnoid hemorrhage. It usually happens from the third day after the aneurysm event, and reaches its peak on 5th to 7th day. There are several mechanisms proposed for this complication. Blood products released from subarachnoid hemorrhage stimulates the tyrosine kinase pathway causing the release of calcium ions from intracellular storage, resulting in smooth muscle contraction of cerebral arteries. Oxyhaemoglobin in cerebrospinal fluid (CSF) causes vasoconstriction by increasing free radicals, endothelin-1, prostaglandin and reducing the level of nitric oxide and prostacyclin. Besides, the disturbances of autonomic nervous system innervating cerebral arteries is also thought to cause vasospasm.
complications of Vertebral artery dissection
medical cause of Vertebral artery dissection
symptoms of Vertebral artery dissection
symptom of Vertebral artery dissection
complications of Giant cell arteritis
symptom of Idiopathic intracranial hypertension
complications of Trigeminal neuralgia
symptom of Giant cell arteritis