Minimum Current for Train-of-four Monitoring

Give 4 electrical stimulants on the ulnar nerve to see if the 4 responses (T1 \~ T4) of adductor pollicis fade or not. If there's no neuromuscular block, it shows no fade, or it fades. When an operation is over under general anesthesia, we use the ratio of the height of T4 to T1, and the ratio is over 90%, the neuromuscular block is recovered enough to extubation.