title: Cardiac output and propofol concentrations in prone surgical patients.
abstract: 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] microg/ml; P = 0.93). We conclude that prone positioning on the Wilson frame does not affect cardiac output or plasma propofol concentration.
authors.affiliation: Department of Anaesthesia and Pain Management, Royal Melbourne Hospital, University of Melbourne, Melbourne, Victoria. kate.leslie@mh.org.au
authors.forename: K
authors.initials: K
authors.lastname: Leslie
authors.forename: C Y X
authors.initials: CY
authors.lastname: Wu
authors.forename: A R
authors.initials: AR
authors.lastname: Bjorksten
authors.forename: D L
authors.initials: DL
authors.lastname: Williams
authors.forename: G
authors.initials: G
authors.lastname: Ludbrook
authors.forename: E
authors.initials: E
authors.lastname: Williamson
mesh_terms: D000328:Adult; D018686:Anesthetics, Intravenous / Q000097:blood*; D002302:Cardiac Output; D006801:Humans; D019637:Orthopedic Procedures; D016684:Prone Position; D015742:Propofol / Q000097:blood*; D011446:Prospective Studies; D016683:Supine Position
chemical_list: D018686:Anesthetics, Intravenous; D015742:Propofol