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British Journal of Anaesthesia, 2003, Vol. 91, No. 6 797-799
© 2003 The Board of Management and Trustees of the British Journal of Anaesthesia

Clinical Investigations

Real-time breath monitoring of propofol and its volatile metabolites during surgery using a novel mass spectrometric technique: a feasibility study

G. R. Harrison1, A. D. J. Critchley2, C. A. Mayhew*,2 and J. M. Thompson2

1 Featherstone Department of Anaesthesia and Intensive Care, Queen Elizabeth Hospital, University Hospital Birmingham NHS Trust, Birmingham B15 2TH, UK. 2 Molecular Physics Group, School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK

*Corresponding author. E-mail: c.mayhew@bham.ac.uk

Background. At present, there is no rapid method for determining the plasma concentration of i.v. anaesthetics. A solution might be the measurement of the anaesthetic concentration in expired breath and its relation to the plasma concentration. We used chemical ionization methods to determine whether an i.v. anaesthetic can be detected in the low concentrations (parts per billion by volume) in the expired breath of an anaesthetized patient.

Method. Chemical ionization mass spectrometry can measure trace gases in air with high sensitivity without interference from major gases. We carried out a feasibility trial with a proton transfer reaction mass spectrometer (PTR-MS) to monitor the i.v. anaesthetic agent propofol and two of its metabolites in exhaled gas from an anaesthetic circuit. Exhaled gas was sampled via a 4 m long, unheated tube connected to the PTR-MS.

Results. Propofol and its metabolites were monitored in real time in the expired breath of patients undergoing surgery.

Conclusion. Routine measurement of i.v. agents, analogous to that for volatile anaesthetic agents, may be possible.

Br J Anaesth 2003; 91: 797–9


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