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A cerebral oximeter is a noninvasive monitor that is applied to a patient's forehead to measure regional cerebral oxygen saturation (rSO2). Normal rSO2 values are between 60% and 80%. In a 6-month observational pilot study, researchers examined results of continuous cerebral oximetry monitoring in a convenience sample of 50 adult patients in cardiac arrest.
Overall, 52% of patients achieved return of spontaneous circulation (ROSC). These patients had significantly higher mean rSO2 than patients who did not have ROSC (47% vs. 32%). No difference in mean rSO2 was observed between patients with and without ROSC among those with initial arrest rhythms of ventricular fibrillation or tachycardia (24%), but differences were significant among those …