The prognostic value of cerebral oxygen saturation measurement for assessing prognosis after cardiopulmonary resuscitation

Background: Despite new improvements on cardiopulmonary resuscitation (CPR), brain damage is very often after resuscitation. Objective: To assess the prognostic value of cerebral oxygen saturation measurement (rSO(2)) for assessing prognosis on patients after cardiopulmonary resuscitation. Design: Retrospective analysis. Measurements and results: We analyzed 25 post-CPR patients (12 female and 13 male). All the patients were cooled to a target temperature of 33-34 degrees C. The Glascow Coma Scale (GCS), Corneal Reflexes (CR), Pupillary Reflexes (PR), arterial Base Excess (BE) and rSO(2) measurements were taken on admission. The rewarming GCS, CR, PR, BE and rSO(2) measurements were made after the patient's temperature reached 36 degrees C. Results: In survivors, the baseline rSO(2) value was 67.5 (46-70) and the percent difference between baseline and rewarming rSO(2) value was 0.03 (0.014-0.435). In non-survivors, the baseline rSO(2) value was 30 (25-65) and the percent difference between baseline and rewarming rSO(2) value was 0.031 (-0.08 to -20). No statistical difference was detected on percent changes between baseline and rewarming values of rSO(2). Statistically significant difference was detected between baseline and rewarming GCS groups (p = 0.004). No statistical difference was detected between GCS, CR, PR, BE and rSO(2) to determine the prognosis. Conclusion: Despite higher values of rSO(2) on survivors than non-survivors, we found no statistically considerable difference between groups on baseline and the rewarming rSO(2) values. Since the measurement is simple, and not affected by hypotension and hypothermia, the rSO(2) may be a useful predictor for determining the prognosis after CPR. (C) 2016 Sociedade Brasileira de Anestesiologia. Published by Elsevier Editora Ltda.