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Microbial growth on the anesthesia machine.

Patricia A Maslyk1, Daniel A Nafziger, Susan M Burns

  • 1Genesys Regional Medial Center, Grand Blanc, Mich., USA.

AANA Journal
|March 13, 2002
PubMed
Summary

Microbial growth on anesthesia machines after use was studied. While pathogenic bacteria were identified, the increase in colony-forming units (CFUs) was not statistically significant, possibly due to cleaning variations.

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Area of Science:

  • Anesthesiology
  • Microbiology
  • Infection Control

Background:

  • Anesthesia equipment is near the oropharynx and body fluids, posing cross-contamination risks.
  • Understanding microbial contamination on anesthesia machines is crucial for patient and staff safety.

Purpose of the Study:

  • To quantify microbial growth on anesthesia machines after a full day's use in the operating room.
  • To identify specific microorganisms present on the anesthesia machine surface.

Main Methods:

  • A descriptive bacteriology study was conducted.
  • Colony-forming units (CFUs) were measured before and after equipment use.
  • The Wilcoxon signed rank test analyzed the change in CFUs.

Main Results:

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  • Several microorganisms were identified on the anesthesia machine tabletop, including coagulase-negative Staphylococcus, Bacillus, alpha Streptococcus, Acinetobacter, Staphylococcus aureus, and gram-negative rods.
  • Pathogenic organisms like alpha Streptococcus, Acinetobacter, S. aureus, and gram-negative rods were found.
  • The increase in CFUs before and after use was not statistically significant (P = 0.12).

Conclusions:

  • While pathogenic bacteria were detected on anesthesia machines, the overall increase in microbial load was not statistically significant.
  • Variations in terminal cleaning protocols may have influenced the microbial counts.
  • Further investigation into standardized cleaning practices is warranted to mitigate potential infection risks.