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Cardiac output and propofol concentrations in prone surgical patients

Department of Anaesthesia and Pain Management, Royal Melbourne Hospital, Departments of Pharmacology and Medicine, University of Melbourne, Melbourne, Victoria and Department of Anaesthesia, University of Adelaide, Adelaide, Australia

Summary

The aim of this study was to compare cardiac output and plasma propofol concentrations in the supine and prone positions in healthy adult patients presenting for lumbar spine surgery. Patients received propofol and remifentanil via effect-site steered target-controlled infusions. Cardiac output and plasma propofol concentration were compared during 20 minutes in the supine position and 20 minutes after positioning on a Wilson frame. Cardiac output did not change significantly over 20 minutes in either position (P=0.37) and was similar at 20 minutes in the supine (6.1 [1.6] l/minute) and prone positions (6.1 [1.9] l/minute) (P=0.87). Propofol concentrations were similar in the supine and prone positions at 20 minutes (2.55 [0.89] and 2.53 [0.90] μg/ml-1; P=0.93). We conclude that prone positioning on the Wilson frame does not affect cardiac output or plasma propofol concentration.

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