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.
Age range
18 Years – 70 Years
Sex
ALL
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A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
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)