Try to describe the etiology, clinical manifestations and nursing care of subarachnoid hemorrhage.

Etiology: There are many reasons for subarachnoid hemorrhage, among which congenital intracranial aneurysm is the most common, followed by cerebrovascular malformation and cerebral arteriosclerosis, followed by cerebral arteritis caused by various infections, tumor destroying blood vessels, hematological diseases and collagen system diseases.

Clinical manifestations: More than half of the cases have premonitions of paroxysmal headache before bleeding, which can occur when they are quiet or active, and the onset is common when they are active. Patients often have severe headaches. Starting from a certain part, the first headache often points to the rupture of blood vessels. Then vomiting, frequent delirium and convulsions, high blood pressure, irritability and incontinence. Coma is often shallow and lasts for a short time. There is often a period of fever after bleeding. If the bleeding stops, the symptoms such as headache will be gradually relieved, and the symptoms can disappear completely after 2 ~ 3 weeks, or there are signs of slight nerve damage. Subarachnoid hemorrhage often occurs repeatedly, and the clinical manifestations of the second hemorrhage are similar to those of the previous one.

Nursing: Patients in acute stage should stay in bed for more than 4 weeks, keep the ward quiet and avoid light. It is necessary to keep the defecation unobstructed and avoid bleeding again when forcibly defecating. Observe consciousness, pupil, blood pressure, pulse and breathing closely. If there are signs of rebleeding, it should be handled in time. If you have consciousness disorder, follow the routine care of comatose patients.