PMC6123882_01
Transcranial motor evoked potentials (from left to right: Right and left abductor digiti minimi, right and left tibialis anterior, right and left abductor hallucis, right and left triceps surae - listed as gastrocnemius) Scale 10 ms/Div; 100 muV/Div on ADM, tibialis anterior and triceps surae, 2000 muV/Div on AH. Note progressive loss of TcMEP at 15:09:43 coinciding with an abrupt hypotension and recovery at 15:18:16 after procedures to increase blood pressure were applied.
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TcMEP (Fig. 1) as well as the H-reflexes (Fig. 2), which started to fall simultaneously. This event coincided with an abrupt hypotension (mean blood pressure 45 mmHg, departing from 75 mmHg), and the responses decreased in amplitude almost to disappearance.