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British Journal of Anaesthesia, 1991, Vol. 66, No. 3 300-304
© 1991 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

VIABILITY AND DISTRIBUTION OF BACTERIA AFTER PASSAGE THROUGH A CIRCLE ANAESTHETIC SYSTEM

P. M. MURPHY, M.B., B.S., M.R.C.P., F.C.ANAES.*,, R. B. FITZGEORGE, PH.D. and R. F. BARRETT, M.B., B.S., F.C.ANAES.

Department of Anaesthesia, Odstock Hospital Salisbury SP2 8BJ
Public Health Laboratory Service, Centre for Applied Microbiology and Research Porton Down, Salisbury, Wiltshire SP4 OJD

We have assessed in vitro the viability of eight species of micro-organism suspended as aerosols and passed through a soda-lime absorber rebreathing system. As had been predicted, the soda-lime exerted a potent cidal effect on non-sporing organisms, all of which were rendered non-viable. One percent of the spore bearing organism. Bacillus subtilis, was still viable after 30 min contact. Although Bacillus subtilis is an organism of low pathogenicity, spores may be more resistant to the alkaline medium of the soda-lime. The micro-organisms were observed to lodge in all components of the breathing system, with the greatest concentration being recovered from the corrugated tubing. We recommend that disposable components of the circle breathing system should be changed, and the non-disposable parts sterilized or disinfected, daily. Soda-lime cannisters should be sterilized or disinfected when changing the soda-lime.

*Present address: Department of Anaesthesia, Gloucestershire Royal Hospital, Gloucester GL1 3NN.


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