Mapping the Natural History of Parenychymal and Cerebral Perfusion Changes in Acute Ischemic and Hemorrhagic Strokes Using Cranial Ultrasound and Continuous Trans-Cranial Doppler

To explore the correlation of brain parenchyma lesions changes and cerebral perfusion parameters as measured by cranial ultrasound transcranial Doppler to patient's blood pressure in a continuous fashion and correlate these to clinical and radiological features of cerebral perfusion. This study will lead to answering clinical management questions like is accurate diagnosis of hemorrhagic stroke possible that could be applied to the field evaluation of stroke patients, optimum blood pressure targets for different subsets of population studied ( multifocal disease, collateralized circulation etc), course of fluctuations in cerebral blood flow in response to systemic blood pressure changes or presence of persistent embolic signals in patients with presumed cardio-embolic strokes.