The test will not be ordered solely for research purposes. To meet study inclusion, transcranial Doppler (TCD) testing will be ordered as part of the standard of care for these patients. Patients enrolled in the study are recruited from the pool of neuro-critical care patients admitted to the surgical intensive care unit (SICU). Up to 12 subjects will be recruited over a 1 year period. The probe will be placed in the preauricular region of the temporal window Patients will be in the supine position while measurements are obtained. Standard of care on specific neuro critical care patients (such as cerebral aneurysms) is to undergo daily TCD monitoring to assess for possible vasospasm. Three different TCD technicians will do triplicate readings on 3 consecutive days on up to 12 patients already undergoing TCD as ordered by their treating team. There are no known side effects from the non-invasive measurement of cerebral blood flow using ultrasound Due to the nature of the disease, there is a high likelihood that patients are either unconscious, of limited mental capacity and/or have been intubated therefore when appropriate the legally authorized representative will be utilized to obtain research consent. When the patients are admitted in the surgical ICU, the study staff will determine eligibility based on the protocol inclusion criteria. Why Should I Register and Submit Results?.
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