Fig. 2
From: An evaluation of anesthetic fade in motor evoked potential monitoring in spinal deformity surgeries
Amplitude changes of the abductor digiti minimi (ADM) and abductor hallucis (AH) muscles post-propofol infusion. a In the ADM, the amplitude at 5 and 6 h was significantly lower than that at 2 h. Amplitudes were obtained from 120 cases at 1 h, 127 cases at 2 h, 127 cases at 3 h, 111 cases at 4 h, 75 cases at 5 h, and 18 cases at 6 h. b In the AH, the amplitude at 4, 5, and 6 h was significantly lower than at 2 h. Amplitudes were obtained from 129 cases at 1 h, 139 cases at 2 h, 139 cases at 3 h, 122 cases at 4 h, 86 cases at 5 h, and 21 cases at 6 h. (*P < 0.05, **P < 0.005, †P < 0.0005, ‡P < 0.0000005). Values are expressed as means, and bars represent standard deviations