Intraoperative hypotension and blood pressure variability are associated with postoperative complications in surgical patients. The investigators have developed a closed-loop vasopressor (CLV) controller that titrates norepinephrine to correct hypotension. After having tested the system in a small cohort series of patients undergoing major surgeries, the investigators aimed to test the feasibility of the CLV controller in three high risk patients undergoing cardiac surgery
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percentage of time spent during surgery in hypotension
Timeframe: during surgery