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Abstract:
This randomized prospective study of all invasive catheters inserted in our ICU tested the hypothesis that daily dressing changes would reduce the 25% infection rate associated with these catheters. Significant growth was noted in eight (7%) of 133 vs. nine (6.7%) of 135 skin cultures from patients whose dressings and infusion tubings were changed at 24 vs. 72 h, respectively. Catheter tip cultures were positive in six (5.9%) of 102 vs. eight (7.5%) of 107 for the 24- and 72-h groups, respectively. Paradoxically, blood cultures were positive in three (6.7%) of 45 vs. 12 (23.1%) of 52 from the 24- and 72-h groups, respectively (p less than .03). However, there was no correlation between the positive blood cultures and the organisms cultured from the catheter tips.
Insights
Daily dressing changes for invasive catheters did not reduce infection rates. Surprisingly, more positive blood cultures occurred in the 24-hour group, suggesting current protocols may need re-evaluation for intensive care unit (ICU) settings.
Area of Science:
- Infectious Disease
- Critical Care Medicine
- Medical Microbiology
Background:
- Invasive catheters are crucial in intensive care units (ICUs) but are associated with significant infection risks, historically around 25%.
- Standard protocols often involve regular dressing changes to mitigate catheter-related infections.
Purpose of the Study:
- To test the hypothesis that daily dressing changes reduce the infection rate of invasive catheters in an ICU.
- To compare the efficacy of 24-hour versus 72-hour dressing and infusion tubing change intervals.
Main Methods:
- A randomized prospective study was conducted involving all invasive catheters inserted in the ICU.
- Skin, catheter tip, and blood cultures were obtained and analyzed.
- Patients were divided into two groups: 24-hour dressing/tubing changes and 72-hour dressing/tubing changes.
Main Results:
- No significant difference in skin or catheter tip culture positivity was observed between the 24-hour and 72-hour groups.
- Paradoxically, the 24-hour group showed a significantly lower rate of positive blood cultures (6.7%) compared to the 72-hour group (23.1%, p < .03).
- No correlation was found between positive blood cultures and organisms identified in catheter tip cultures.
Conclusions:
- Daily dressing and infusion tubing changes did not decrease the incidence of catheter-related infections in this ICU study.
- The observed increase in positive blood cultures in the 24-hour group warrants further investigation into optimal catheter care protocols.