• Hiroshi Kondo, Ryuji Nakamura, Ayako Kobatake, Yukiko Nao, Ken Hashimoto, and Keio Nakatani.
• Department of Anesthesiology, National Hospital Organization Higashihiroshima Medical Center, 513, Saijocho Jike, Higashihiroshima-shi, Hiroshima, Japan. h.kondo1986@gmail.com.
• J Anesth. 2020 Jun 1; 34 (3): 338-341.

PurposeThe oxygen reserve index (ORi™) is a parameter used for the noninvasive evaluation of arterial partial pressure of oxygen (PaO2), specifically in the 100-200 mmHg range. We aimed to report on the impact of indocyanine green (ICG) on the ORi™.MethodsIn this study, we retrospectively examined patients who underwent neurosurgery between April and July 2019 and assessed the impact of ICG on ORi™. We excluded patients who did not use ICG or who were not examined for ORi™. The dose and timing of ICG administration were determined by a neurosurgeon. The changes in ORi™ were measured for up to 30 min.ResultsWe analyzed ten patients and found that the ORi™ increased to 1.00 in all of them. The median time for ORi ™ to rise to 1.00 after ICG administration was 2 min (range 1-4). After rising to 1.00, ORi ™ decreased and took 27 min to return to the pre-dose value.ConclusionIt is important to consider the initial rapid increase and subsequent slow decrease in ORi™ when using ICG during surgery.

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