Table 20-11
- Single Twitch (intervals of >10 sec)
- Use amplitude to construct dose–response curves and evaluate onset time
- Tetanus (frequency ≥30 Hz)
- Peak response followed by fade
- More sensitive than single twitch in detecting residual neuromuscular blockade
- Train-of-Four Ratio: height of fourth twitch to that of the first twitch
More sensitive than single twitch and similar sensitivity to tetanic stimulation
Evaluate responses manually or visually - Posttetanic Count: applies when there is no response to single twitch, tetanus, or train-of-four stimulation
- Double-Burst Suppression: two short tetanic stimulations
Evaluates the ratio of the second to the first response (correlates with the train-of-four ratio but is easier to detect manually)