Cardiovascular changes after achieving constant effect site concentration of propofol

Anaesthesia
E S JackJ Kinsella

Abstract

Target controlled infusions of propofol use a pharmacokinetic/pharmacodynamic model to calculate an effect site concentration of the drug. We assessed the cardiovascular stability of 10 healthy patients using non-invasive thoracic bioimpedance and their 'depth' of anaesthesia using the Bispectral index after they had been anaesthetised to a constant effect site concentration of propofol (6.5 min from starting). Each patient had no surgical stimulus and received no intravenous fluid during the study period. The patients also received effect site target controlled remifentanil (steady state 2.5 min from starting) and a bolus of vecuronium to facilitate intubation and ventilation. We mathematically calculated when each measured parameter would reach a state of stability (i.e. with 95% certainty). Heart rate levelled off at 20 min, Bispectral index at 32 min, and cardiac index and mean arterial pressure at 47 min after achieving effect site stability, the final levels being, respectively, 21%, 47%, 14% and 28% lower than those at effect site stability. We conclude that cardiovascular parameters continue to change to a clinically significant degree after achieving a constant effect site concentration of propofol via target controlle...Continue Reading

References

Jul 1, 1991·British Journal of Anaesthesia·B MarshG N Kenny
Jan 1, 1988·British Journal of Anaesthesia·M A ClaeysF Camu
Jan 5, 2000·British Journal of Anaesthesia·C S Aun
Mar 17, 2000·Anesthesiology·J Schüttler, H Ihmsen
Feb 21, 2002·Journal of Cardiothoracic and Vascular Anesthesia·W Scott SagemanBruce D Spiess
Jul 5, 2005·European Journal of Anaesthesiology·K J AndersonJ Kinsella
Apr 25, 2006·Anesthesia and Analgesia·Richard Klaus EllerkmannJörgen Bruhn

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Citations

Feb 16, 2011·Paediatric Anaesthesia·Brian J Anderson
Jan 29, 2014·Paediatric Anaesthesia·Brian J Anderson, John van den Anker
Jul 25, 2009·Paediatric Anaesthesia·Brian J Anderson

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