Experimental Contamination of a Closed Endotracheal Suction System: 24 h vs 72 h |
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Authors: | E Meyer M Schuhmacher W Ebner M Dettenkofer |
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Institution: | (1) Dept. of Environmental Health Sciences, University Medical Center Freiburg, Freiburg, Germany;(2) Institute of Environmental Health Sciences, University Medical Center Freiburg, Breisacherstr. 155B, 79106 Freiburg, Germany |
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Abstract: | Abstract
Objective:
To ascertain the desirability of replacing closed suction systems after 72 h rather than after 24 h (manufacturer’s recommendations)
because it is possible that a reduction in the frequency of manipulations might reduce the risk of exogenous nosocomial pneumonia.
We investigated the presence of time-dependent differences (after 24 h and 72 h) in pathogen survival/growth in artificially
contaminated closed suction catheters (OptiFlo?).
Design:
The trial simulated bacterial contamination of the airways using a suspension of 2 × 103 CFU/ml of Staphylococcus aureus or Pseudomonas aeruginosa. Contamination was performed on a total of 80 catheters. Forty were contaminated a total of eight times every 45–60 min.
Another 40 catheters underwent the same procedure 24 times over three consecutive days. Microbiological analysis of the catheters
took place after 24 h and 72 h, respectively.
Results:
The mean S. aureus load was 9.4 CFU/catheter after eight suction procedures and 6.2 CFU/catheter after 24 suction procedures (3 days). Mean
growth of P. aeruginosa was 5.3 CFU/catheter, and 8.2 CFU/catheter after 3 days. There was no statistically significant difference between day 1
and 3 for S. aureus (p = 0.474), but there was for P. aeruginosa (p = 0.004).
Conclusion:
Our findings show that, from an experimental point of view, it remains controversial whether routine change of closed suction
catheters can be extended from 24 h to 72 h. However, clinical evidence suggests that prolonged use of a closed suctioning
system is safe. |
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Keywords: | |
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