Background: Cerebral regional oxygen saturation (rSO2) can be measured immediately and noninvasively just after arrival at the hospital and may be useful for evaluating the futility of resuscitation for a patient with out-of-hospital cardiopulmonary arrest (OHCA). We examined the best practices involving cerebral rSO₂ as an indicator of the futility of resuscitation.
Methods: This study was a single-center, prospective, observational analysis of a cohort of consecutive adult OHCA patients who were transported to the University of Tokyo Hospital from October 1, 2012, to September 30, 2013, and whose cerebral rSO₂ values were measured.
Results: During the study period, 69 adult OHCA patients were enrolled. Of the 54 patients with initial lower cerebral rSO₂ values of 26% or less, 47 patients failed to achieve return of spontaneous circulation (ROSC) in the receiver operating characteristic curve analysis (optimal cutoff, 26%; sensitivity, 88.7%; specificity, 56.3%; positive predictive value, 87.0%; negative predictive value, 60.0%; area under the curve [AUC], 0.714; P = .0033). The AUC for the initial lower cerebral rSO₂ value was greater than that for blood pH (AUC, 0.620; P = .1687) or lactate values (AUC, 0.627; P = .1081) measured upon arrival at the hospital as well as that for initial higher (AUC, 0.650; P = .1788) or average (AUC, 0.677; P = .0235) cerebral rSO₂ values. The adjusted odds ratio of the initial lower cerebral rSO₂ values of 26% or less for ROSC was 0.11 (95% confidence interval, 0.01-0.63; P = .0129).
Conclusions: Initial lower cerebral rSO₂ just after arrival at the hospital, as a static indicator, is associated with non-ROSC. However, an initially lower cerebral rSO₂ alone does not yield a diagnosis performance sufficient for evaluating the futility of resuscitation.
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