• Kei Nishiyama, Noritoshi Ito, Tomohiko Orita, Kei Hayashida, Hideki Arimoto, Satoru Beppu, Mitsuru Abe, Takashi Unoki, Tomoyuki Endo, Akira Murai, Takeshi Hatada, Noriaki Yamada, Masahiro Mizobuchi, Hideo Himeno, Kazuo Okuchi, Hideto Yasuda, Toshiaki Mochizuki, Kazuhiro Shiga, Migaku Kikuchi, Yuka Tsujimura, Tetsuo Hatanaka, Ken Nagao, and J-POP Registry Investigators.
• Department of Primary Care and Emergency Medicine, Kyoto University Graduate School of Medicine, 54 Kawara-machi, Seigoin, Sakyo-ku, Kyoto 606-8507, Japan. Electronic address: keinishi@kuhp.kyoto-u.ac.jp.
• Resuscitation. 2015 Nov 1; 96: 135-41.

AimThis study investigated the value of regional cerebral oxygen saturation (rSO2) monitoring upon arrival at the hospital for predicting post-cardiac arrest intervention outcomes.MethodsWe enrolled 1195 patients with out-of-hospital cardiac arrest of presumed cardiac cause from the Japan-Prediction of Neurological Outcomes in Patients Post-cardiac Arrest Registry. The primary endpoint was a good neurologic outcome (cerebral performance categories 1 or 2 [CPC1/2]) 90 days post-event.ResultsA total of 68 patients (6%) had good neurologic outcomes. We found a mean rSO2 of 21%±13%. A receiver operating characteristic curve analysis indicated an optimal rSO2 cut-off of ≥40% for good neurologic outcomes (area under the curve 0.92, sensitivity 0.81, specificity 0.96). Good neurologic outcomes were observed in 53% (55/103) and 1% (13/1092) of patients with high (≥40%) and low (<40%) rSO2, respectively. Even without return of spontaneous circulation (ROSC) upon arrival at the hospital, 30% (9/30) of patients with high rSO2 had good neurologic outcomes. Furthermore, 16 patients demonstrating ROSC upon arrival at the hospital and low rSO2 had poor neurologic outcomes. Multivariate analyses indicated that high rSO2 was independently associated with good neurologic outcomes (odds ratio=14.07, P<0.001). Patients with high rSO2 showed favourable neurologic prognoses if they had undergone therapeutic hypothermia or coronary angiography (CPC1/2, 69% [54/78]). However, 24% (25/103) of those with high rSO2 did not undergo these procedures and exhibited unfavourable neurologic prognoses (CPC1/2, 4% [1/25]).ConclusionrSO2 is a good indicator of 90-day neurologic outcomes for post-cardiac arrest intervention patients.Copyright © 2015 The Authors. Published by Elsevier Ireland Ltd.. All rights reserved.

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