The purpose of this study is to determine whether the value of analgesia nociception index (ANI) is influenced by variations of systemic venous return (cardiac preload) under general anaesthesia.
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change in ANI between head-down tilt (Trendelenburg) position and head-up tilt position
Timeframe: during changes of operating table slope (i.e., for 1-2 min in each condition, 10-15 min after initial measurements in basal conditions)