Table 1. Effect of Inhaled Anesthetics on Somatosensory Evoked Potentials
NA = data not available; negligible = less than 5% change in latency; ↑= increase; ↓= decrease.
All data are from humans; percent changes are synthesized from multiple sources and based on reported changes in mean values.
* In a substantial fraction of patients, wave forms were not attainable at this concentration.
† Complete loss of waveform observed only with 1.5 minimum alveolar concentration (MAC) desflurane plus 65% nitrous oxide (N2O).
‡ Up to 15% in children. 229
§ Fusion to a single early cortical high-amplitude wave with abolition of all later wave components. Not proven reliable for intraoperative monitoring.
∥ For example, N-20 for median nerve somatosensory evoked potentials (SSEPs) and P-40 for posterior tibial nerve SSEPs (Fig. 3).