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Target‐controlled infusion of propofol induction with or without plasma concentration constraint in high‐risk adult patients undergoing cardiac surgery
Author(s) -
Macquaire V.,
Cantraine F.,
Schmartz D.,
Coussaert E.,
Barvais L.
Publication year - 2002
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1034/j.1399-6576.2002.460814.x
Subject(s) - propofol , medicine , pharmacokinetics , anesthesia , plasma concentration , hemodynamics , cardiac surgery , ejection fraction , target controlled infusion , urology , surgery , heart failure , remifentanil
Background: Calculated plasma (Cp) and calculated effect site concentrations (Ce) of propofol associated with loss of consciousness (LOC) have been studied in young healthy patients. The aim of the study was to evaluate the calculated propofol concentrations required to induce LOC in ASA III adult patients undergoing cardiac surgery using a smooth target controlled infusion of propofol. Methods: After informed consent, 44 patients were premedicated with 0.5 mg alprazolam orally. Propofol TCI using the pharmacokinetic set of Marsh et al. incorporated in the Diprifusor (ThalfKeo of 2.6 min) was used. Propofol Ce was progressively increased by 0.5 µg/ml until LOC was obtained. The constraint on the maximum gradient between Cp and Ce was either 1 µg/ml in group 1 or not limited in group 2. Hemodynamic variations were assessed. Results: Mean preoperative left ventricular ejection fractions were 44 ± 15.4% and 56 ± 11.4% in groups 1 and 2, respectively ( P < 0.01). At LOC, mean Cp was 1.9 µg/ml in both groups but mean Ce was 1.08 ± 0.31 and 1.43 ± 0.42 µg/ml in groups 1 and 2, respectively ( P < 0.01). The mean induction time was 12.8 ± 7.1 min in group 1 and 8.5 ± 2.7 min in group 2 ( P < 0.05). No episode of hypotension has been observed in either group. Conclusion: In ASA III patients undergoing cardiac surgery, smooth propofol TCI induction, using the pharmacokinetic set of Marsh et al. incorporated in the Diprifusor, is associated with LOC at a low mean calculated plasma concentration of 1.9 µg/ml and good hemodynamic stability.