Colonization of mechanical ventilation bags during use
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1University of Alabama School of Nursing, Birmingham 35294-1210.
Background:
Colonization of patients' mechanical ventilation bags was examined to evaluate two criteria (days in use and appearance) for replacing the disposable adapter that interfaces with the patient.
Methods:
Adapters used 1 to 2, 3 to 4 and 6 to 7 days formed groups I, II, and III, respectively (n = 29 to 67 per group). Another group (IA) contained 33 adapters used 1 to 2 days from patients intubated at least 7 days. Appearance of adapters was noted and adapters were swab cultured on nonselective medium.
Results:
Analysis of variance indicated a difference in log colony-forming units per adapter between groups I and II (p = 0.032), but colony-forming units per adapter varied widely. Group III had a lower mean colony-forming unit count than group II. Groups I and II differed in variables other than days of use, but these confounding variables were eliminated by substituting group IA for group I. When adapter appearance versus colonization was examined by chi 2 test, a significant difference was found between adapters that looked "clean" and those with precipitate or with mucus or blood.
Conclusions:
For the subjects studied, colonization of adapters increased significantly between 1 to 2 and 3 to 4 days of use but varied widely. Appearance may be more useful than days in use as a criterion for changing adapters.
Insights
Mechanical ventilator adapter colonization increases between 1-2 and 3-4 days of use. Visual inspection of adapter appearance may be a more reliable indicator for replacement than the number of days in use.
Area of Science:
- Medical Microbiology
- Infectious Disease Prevention
- Biomedical Engineering
Background:
- Assessing microbial colonization of disposable adapters in mechanical ventilation circuits.
- Evaluating the efficacy of current replacement criteria for these critical components.
Purpose of the Study:
- To determine the relationship between the duration of use and microbial colonization of mechanical ventilation adapters.
- To investigate whether the visual appearance of adapters correlates with the level of microbial colonization.
Main Methods:
- Categorizing adapters into groups based on days in use (1-2, 3-4, 6-7 days).
- Utilizing a separate group (IA) for adapters used 1-2 days on patients intubated for at least 7 days.
- Swab culturing adapters on nonselective medium and assessing visual appearance (cleanliness, presence of precipitate, mucus, or blood).
Main Results:
- Significant increase in microbial colonization between 1-2 and 3-4 days of use (p=0.032), with wide variations observed.
- Lower mean colony-forming unit counts in adapters used 6-7 days compared to those used 3-4 days.
- Visual appearance (clean vs. presence of precipitate/mucus/blood) showed a significant correlation with colonization levels.
Conclusions:
- Microbial colonization of mechanical ventilation adapters increases significantly between 1-2 and 3-4 days of use.
- Adapter appearance is a potentially more practical and reliable criterion for replacement than solely relying on the number of days in use.
- Visual assessment can aid in timely and appropriate replacement of ventilation adapters to potentially reduce infection risk.