Comparison of Train of Four, Tetanus 50 and 100 Hz Recovery After Rocuronium Block Reversed by Neostigmine

Device : TOF Scan For each included patient, 2 monitorings (TOF Scan and ITF device) will be placed, one on each hand. Once 4 contractions of the adductor pollicis muscle will be observed on the TOF Scan side following train of four stimulation, 40 µg/kg neostigmine will be injected. Train of four ratio (delivered every minute) will be recorded. This sequence (tetanus 100 Hz followed by tetanus 50 Hz) will be repeated 6 times. For each tetanus stimulation, the ratio between the residual force and the maximum force generated by the adductor pollicis muscle will be recorded (this ratio illustrates the fade phenomenon). At the end of this period lasting 30 minutes after neostigmine administration, anesthetic drug delivery will be stopped and the patient wil be allowed to recover.

Device ITF For each included patient, 2 monitorings (TOF Scan and ITF device) will be placed, one on each hand. Once 4 contractions of the adductor pollicis muscle will be observed on the TOF Scan side following train of four stimulation, 40 µg/kg neostigmine will be injected. Train of four ratio (delivered every minute) will be recorded. This sequence (tetanus 100 Hz followed by tetanus 50 Hz) will be repeated 6 times. For each tetanus stimulation, the ratio between the residual force and the maximum force generated by the adductor pollicis muscle will be recorded (this ratio illustrates the fade phenomenon). At the end of this period lasting 30 minutes after neostigmine administration, anesthetic drug delivery will be stopped and the patient wil be allowed to recover.