PMID: 15220778Jun 29, 2004Paper

An in vivo evaluation of the mycobacterial filtration efficacy of three breathing filters used in anesthesia

Anesthesiology
Daniel P VezinaRobert Guidoin

Abstract

The use of breathing filters (BFs) has been recommended to protect the anesthesia apparatus in proven or suspected cases of tuberculosis. Some investigators have also suggested the use of BF to alleviate the need to change anesthesia breathing circuits after each case. This study evaluated the filtration efficacy of three different BFs to prevent mycobacterial contamination of breathing circuits in a model that uses a test animal. Ten Pall BB25A (pleated hydrophobic) (Pall Canada Ltd., Mississauga, Ontario, Canada), six DAR Barrierbac S (felted electrostatic; Mallinckrodt DAR, Mirandola, Italy), and six Baxter Airlife (felted electrostatic; Baxter Canada, Mississauga, Ontario, Canada) BFs were studied. For each BF tested, 20 ml of a high concentration suspension of Mycobacterium chelonae (range, 2.0 x 10 to 9.0 x 10 colony-forming units/ml) was nebulized during 2 h at the proximal end of the endotracheal tube of anesthetized pigs. At the end of the nebulization period, the BFs were sampled for culture. The titer reduction value (number of microorganisms challenging the BF divided by the number of microorganisms recovered downstream of the BF) and the removal efficiency (difference between the number of microorganisms challengin...Continue Reading

References

Nov 1, 1992·British Journal of Anaesthesia·M G LeeP W Swanson
May 1, 1992·Anaesthesia·R M Hedley, J Allt-Graham
May 1, 1989·Infection Control and Hospital Epidemiology : the Official Journal of the Society of Hospital Epidemiologists of America·C E HaleyJ P Luby
Mar 1, 1987·Reviews of Infectious Diseases·G L Woods, J A Washington
May 1, 1988·The American Journal of Medicine·H S KantorS L Pusateri
Aug 1, 1994·British Journal of Anaesthesia·R M Hedley, J Allt-Graham
Apr 1, 1997·Infection Control and Hospital Epidemiology : the Official Journal of the Society of Hospital Epidemiologists of America·H Aranha-CreadoH Brandwein
Feb 13, 1999·Journal of Clinical Microbiology·B A HannaA M Vannier

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