The purpose of this study is to compare two different strategies of intraoperative mean arterial pressure (MAP) and stroke volume index management in high-risk patients undergoing major abdominal and orthopedic surgery (manual versus automated) The investigators hypothesis is that the automated group will spend less time during surgery in hypotension (defined as a MAP\<90% of patient's MAP baseline) compared to the manual group.
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Percentage of surgery time in hypotension
Timeframe: at day 1