Figure 4. Percentage changes in compound muscle action potentials amplitude of the control value (amplitude of compound muscle action potentials after single-pulse stimulation before the administration of isoflurane) after single-pulse, double-pulse (a), and triple-pulse (b) stimulation of the motor cortex before and during the administration of isoflurane. Interstimulus interval of each pulse is changed at 0.3, 0.5, 1, 1.5, and 2 ms. Data are expressed as mean +/- SEM.