More specific but less sensitive. Less likely to have a false positive, but more likely to have a false negative.

More robust—less affected by anesthesia

More sensitive but less specific. Less likely to have a false negative, but more likely to have a false positive.

Less robust—highly affected by anesthesia

When inhalational anesthetics are used, motors not infrequently will begin to decrement over time with long cases. In order to avoid this, we have found that the use of total intravenous anesthesia leads to better maintenance of MEPs in long cases.