When anesthesiologists or intensive care physicians are determining suitability for reversing neuromuscular blockade, a train-of-four or “twitch” test is performed. This is done by causing a small electrical current to pass through an easily observed muscle and noting the number of times the muscles twitches, roughly corresponding to the percentage of neuromuscular receptors still blocked as listed below,
Twitches | % Receptors Blocked |
4/4 | < 75% |
3/4 | 75% |
2/4 | 80% |
1/4 | 90% |
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