• Eiki Kanemaru, Kenji Yoshitani, Shinya Kato, Yuichi Tanaka, and Yoshihiko Ohnishi.
• Department of Anesthesiology, National Cerebral and Cardiovascular Center, Osaka, Japan.
• J. Cardiothorac. Vasc. Anesth. 2018 Apr 1; 32 (2): 709-714.

ObjectiveAlthough motor-evoked potentials (MEPs) disappear in deep hypothermic circulatory arrest (DHCA), MEPs have been used to confirm whether motor function is intact after DHCA. It is crucial to know the timing, body temperature, and MEP amplitude at MEP reappearance to detect spinal cord ischemia after DHCA. However, data on these parameters are sparse. The authors investigated the characteristics of MEPs at reappearance after DHCA.DesignA retrospective observational study.SettingSingle national center.ParticipantsSixty-one patients who underwent descending aortic replacement and thoracoabdominal aortic replacement with DHCA between January 2013 and December 2015.InterventionsNone.Measurements And Main ResultsThe authors extracted the following data: time to MEP reappearance after the end of lower extremity circulatory arrest, bladder temperature (BT) and nasopharyngeal temperature (NPT) when MEPs recovered, and %amplitude of MEPs relative to control values at MEP reappearance. The median time to MEP reappearance was approximately 70 minutes. BT at MEP reappearance ranged from 34.3°C to 34.6°C and NPT ranged from 36.2°C to 36.4°C. At MEP reappearance, %amplitude less than 50% of the control value was observed in more than 50% of patients. Time to MEP reappearance had a significant positive association with rewarming time (p < 0.01) and BT (p = 0.03).ConclusionsThere was a wide variation in MEP amplitude at reappearance during the rewarming phase. BT was approximately 34°C when MEPs in the leg recovered. The time to MEP reappearance is influenced significantly by rewarming time and BT.Copyright © 2017 Elsevier Inc. All rights reserved.

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