Subarachnoid hemorrhage may recur after two years, but the recurrence rate is very low.
Subarachnoid hemorrhage is divided into traumatic and spontaneous, the latter being further divided into primary and secondary. Primary subarachnoid hemorrhage is the rupture of vascular lesions (such as aneurysm, cerebral vascular malformation, etc.) at the base of the brain or on the surface of the brain, and the blood flows into the subarachnoid space; secondary subarachnoid hemorrhage is the hematoma in the brain that penetrates the brain tissue, and the blood flows into the subarachnoid space.
1. Traumatic subarachnoid hemorrhage: it may still occur after 2 years of re-traumatization.
2. Primary subarachnoid hemorrhage: 20% of patients with aneurysm can have rebleeding 10-14 days after the disease, which doubles the mortality rate, and rebleeding in the acute phase of arteriovenous malformation is less common. The likelihood of reoccurrence within two years is very small, but cannot be ruled out.
The probability of new aneurysm is 1%~2% per year after treatment. Regular follow-up and strict blood pressure control can intervene before the aneurysm ruptures, and it is possible to avoid recurrence of subarachnoid hemorrhage. Subarachnoid hemorrhage caused by cerebrovascular malformation is less likely to recur if the malformed blood vessel has been surgically treated.
3. Secondary subarachnoid hemorrhage: controlling high-risk factors, such as hypertension, diabetes mellitus, dyslipidemia, etc. reduces cerebral atherosclerosis, prevents cerebral hemorrhage, and reduces the recurrence rate of subarachnoid hemorrhage.
Therefore, patients who have had subarachnoid hemorrhage should strengthen the follow-up, regular physical examination, and if symptoms occur, they should be treated in time.