Fig. 3.

Patient 3. Reversible MEP deterioration in a 22-year-old woman diagnosed with a right cervical AVM (C6-C7). a The TES MEPs at about 20 min into the Onyx embolization. b The MEPs in the left APB and biceps disappeared almost completely. There was a significant decrease in amplitude in the right APB and both TA. The neuroradiologist was informed about the situation, and the procedure was aborted. c As the stimulus intensity was gradually increased to 180 V above baseline, we observed a progressive recovery of the affected MEPs, which reached their initial level after 20 min. L = Left; R = right.