Minimum Current for Train-of-four Monitoring

Determination of the Minimum Current for Train-of-four Monitoring by Acceleromyography and Electromyography During the Recovery From General Anesthesia

Neuromuscular monitoring during general anesthesia is important to make sure adequate muscle relaxation during operation and adequate recovery of muscle power and spontaneous breathing during emergence from general anesthesia. The neuromuscular monitoring is usually using electrical stimulants and the method called train-of-four (TOF) is representative. Because it uses electrical stimulants, the patients could be uncomfortable and feel pain during the monitoring when the patients are conscious. Lowering the current of the stimulants would be helpful in reducing the pain, but there is a concern that the TOF results performed in lower current would be underestimated or inaccurate. Therefore, the investigators want to find the minimal current for TOF monitoring that shows adequate TOF results.

Inclusion Criteria:

• Age 20-65
• Scheduled for an elective surgery
• ASA physical status 1 or 2

Exclusion Criteria:

• BMI > 25 kg/m2
• Neuromuscular disease
• Decreased renal function
• Neurologic disorder
• Impossible to cooperate or communicate