Aneurysms are acquired lesions related to hemodynamic stress on the arterial walls at bifurcation points and bends. Saccular or berry aneurysms are specific to the intracranial arteries because their walls lack an external elastic lamina and contain a very thin adventitia—factors that may predispose to the formation of aneurysms.
An additional feature is that they lie unsupported in the subarachnoid space. the German Hospital Diagnosis Statistics were introduced in 1993 with the intention to serve as a database of health care decisions. This purpose requires a high-quality collection of epidemiologically relevant data. From 1993 to 1996 we analysed the datasets obtainable for subarachnoid haemorrhage which is coded with ICD 430.
Treatement is • Remove large collections of blood or relieve pressure on the brain if the hemorrhage is due to an injury • Repair the aneurysm if the hemorrhage is due to an aneurysm rupture If the person is critically ill, surgery may have to wait until the person is more stable. Ongoing Research is being done atSubarachnoid haemorrhage centres.