We piloted long-term diffuse correlation spectroscopy (DCS) monitoring of cerebral blood flow in a patient with an aneurysmal subarachnoid hemorrhage. Measurements were conducted for 18 days. We also recorded blood pressure, ECG, and other clinical monitors as available. The blood flow index from 5, 25, and 30 mm separation channels showed a variety of responses depending on the patient condition and treatment. As an example, repeated doses of nimodipine were given for treatment purposes, resulting in level or increased cerebral blood flow despite a decrease in mean arterial blood pressure. There was correlation between the short-distance channel and heart rate.
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