Abstract 15899: The Effect of Cerebral Oxygenation on Cardiac Arrest Outcomes: A Multicenter Pilot Observational Study

Background: Cardiac arrest (CA) is associated with morbidity and mortality due to cerebral ischemia. We therefore tested the hypothesis that higher regional cerebral oxygenation (rSO2) during resuscitation is associated with improved return of spontaneous circulation (ROSC), survival and neurological outcomes at hospital discharge. We further examined the validity of rSO2 as a test to predict these outcomes. Methods: Multicenter prospective study of in-hospital CA (IHCA). Inclusion criteria: IHCA, age≥18 years, Prolonged CPR≥5 minutes. Patients were recruited consecutively during working hours between 08/2011-09/2014. Survival with a favorable neurological outcome was defined as a Cerebral Performance Category (CPC)1-2. Results: Among 504 IHCA events, 183 (36%) met inclusion criteria. Overall 62/183 (33.9%) achieved ROSC, while 13/183(7.1%) achieved CPC1-2 at discharge. Higher mean±SD rSO2 was associated with ROSC vs. no ROSC (51.8±11.2% vs. 40.9±12.3%) and CPC1-2 vs. CPC3-5 (56.1±10.0% vs. 43.8±12.8%), both P<0.001). Mean rSO2 during the last 5 minutes of CPR best predicted ROSC (AUC=0.76:95% CI:0.69-0.83); rSO2≥25% provided 100% sensitivity (95%CI:94%-100%), 100% negative predictive value (NPV) (95%CI:79%-100%); rSO2 ≥65% provided: 99% specificity (95%CI:95%-100%), 93% positive predictive value (PPV) (95%CI:66%-100%) for ROSC. Time with rSO2>50% during CPR best predicted CPC1-2 (AUC=0.79: 95%CI:0.70-0.88). Specifically, ≥60% CPR time with rSO2>50% provided 77% sensitivity (95%CI:46%-95%), 72% specificity (95%CI:65%-79%) and 98% NPV (95%CI: 93%-100%) for CPC1-2. Conclusions: Cerebral oximetry allows real-time non-invasive cerebral oxygenation monitoring during CPR. Higher cerebral oxygenation during CPR is associated with ROSC and neurologically favorable survival to hospital discharge. Achieving higher rSO2 during resuscitation may optimize the chances of CA favorable outcomes.