A ruptured cerebral aneurysm causes bleeding around the surface of the brain called subarachnoid haemorrhage.
A ruptured aneurysm presents with a “thunderclap” sudden severe headache and there is usually associated neck stiffness. Patients may have depressed consciousness or coma, confusion, photophobia and neurological deficit.
This is a very serious condition with a high mortality rate. Twelve percent of patients die before even reaching the hospital.
If left untreated the mortality is 60% over the first month with significant mortality and morbidity even when treated optimally.
The major factor that determines the outcome is the re rupture rate which is about 2% per day for the first few weeks. A re rupture has a 50% mortality rate.
This is therefore a very serious condition and the most effective way of improving prognosis is the prevention of re rupture. Early treatment therefore improves the outcome.