Phase III prospective randomised study : curare vs placebo, comparing bowel peristalsis (abdominal echography) in the first minutes of after general anesthesia induction.

Primary End Point: proportion of patients with a score of motion = 0

Primary End Point Proportion of patients with a score of motion = 0

Secondary End Point Time at which thumb adductor twitch measurement disappears (3rd consecutive measure with a twitch at 0) Mean minimal twitch measurement for those patients in who twitch measurement does not disappear Concordance study between twitch measurement and bowel peristalsis XML File Identifier: 1vUwHz2uUXeSc7soLu1cQwRAfcM= Page 15/24 ultrasound score.

Inclusion Criteria:

• elective surgery
• scheduled oro tracheal intubation

Exclusion Criteria:

Counter indication to NMBA:

• predicted difficult airway
• surgical counter indication: facial or laryngeal nerve function monitoring
• allergy to muscle relaxants neuro muscular disease Possible alteration of sensitivity to muscle relaxants due to ongoing medication: ex Valproate or aminoglycoside antibiotics. Predictable alteration of bowel movements or difficult abdominal ultrasound:
• scheduled abdominal surgery
• abdominal surgery in last month
• obesity: body mass index over 30 Full stomach or pregnancy requiring suxamethonium for intubation