Fig 1.

Neurophysiological monitoring tracings from patient 5 after intraoperative rupture (A), showing a decrease in right upper extremity SSEP (left yellow box) and loss of bilateral lower extremity SSEP during aneurysm coiling (center and right yellow boxes). Tracing from a similar time point (B), showing a subtle decrease in amplitude of TcMEP involving the right upper extremity (small left yellow box) and a global loss of EEG (large right yellow box). After EVD insertion (C), recovery of SSEP (yellow boxes) can be seen. Concomitantly, there is a return of the normal TcMEP signal intensity and recovery of EEG (D) (yellow boxes).