The Value of Hemodynamic Measurements in the Early Stage of Subarachnoid Hemorrhage
The rupture of a cerebral aneurysm is linked with a reversible derangement of cerebral hemodynamics that can lead to focal or global ischemia, more frequently around the end of the first week after hemorrhage, when the damage caused by the initial bleed has become stable or has already subsided . By an accepted definition, these subacute or delayed ischemic disturbances go under the term of cerebral vasospasm , because in this subacute period the cerebral vessels appear generally constricted at angiography . However, the lack of correlation between the extension and severity of angiographical vasospasm and the development of clinical symptoms suggests that vessel constriction is only a secondary or complicating factor, and that the primary cause of these disturbances is an impairment of cerebral perfusion, produced by the initial hemorrhage.
KeywordsCerebral Blood Flow Subarachnoid Hemorrhage Cerebral Perfusion Intracranial Aneurysm Cerebral Vasospasm
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