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Effect of an expanded physical facility on nosocomial infections in a neonatal intensive care unit
Insights
Increasing neonatal intensive care unit space did not reduce overall nosocomial infections (NIs) or Staphylococcus aureus colonization. However, improved spacing did alter bacterial species causing NIs and reduced infection clusters, suggesting minimized cross-infection.
Area of Science:
- Neonatal Intensive Care Unit (NICU) care
- Infection control in healthcare settings
- Neonatal epidemiology
Background:
- Neonatal intensive care units (NICUs) often face challenges with overcrowding, potentially increasing the risk of nosocomial infections (NIs).
- Staphylococcus aureus colonization is a significant concern in NICU populations.
- Previous studies suggest improved spatial arrangements may impact infection rates.
Purpose of the Study:
- To evaluate the impact of a threefold increase in infant space within a NICU on nosocomial infection (NI) rates.
- To assess changes in Staphylococcus aureus colonization rates following increased spatial allocation.
- To identify shifts in the bacterial species responsible for NIs and analyze infection clustering.
Main Methods:
- A retrospective review of 52 months of data was conducted, comparing a crowded 18-bed unit (39 months) with a spacious 32-bed unit (13 months).
- Infant populations were analyzed for mean length of stay, survival rates, and mean birth weights to ensure comparability between units.
- Nosocomial infection rates, Staphylococcus aureus colonization rates, and the distribution of bacterial species causing NIs were compared between the two unit configurations.
Main Results:
- Overall NI rates (11.7% vs. 9.6%) and Staphylococcus aureus colonization rates (11.7% vs. 10.7%) were not significantly different between the crowded and spacious units.
- NI rates, but not S. aureus colonization, were significantly higher during periods of high patient turnover (p < 0.01).
- A significant shift in causative bacterial species was observed: Klebsiella pneumoniae and Pseudomonas aeruginosa decreased (20.4% to 2.1%), while Staphylococcus epidermidis increased (4.7% to 14.9%) in the spacious unit. Clusters of NIs were markedly reduced.
Conclusions:
- While increased space did not lower overall nosocomial infection or S. aureus colonization rates, it significantly altered the microbial landscape of infections.
- The reduction in specific bacterial pathogens and infection clusters suggests that improved spatial arrangements may minimize cross-transmission events.
- Further research is needed to understand the complex interplay between NICU spatial design, patient turnover, and the epidemiology of neonatal infections.
Abstract:
Fifty-two months' data were reviewed to assess the effect of a threefold increase in space per infant in a neonatal intensive care unit on rates of nosocomial infections (NIs) and colonization with Staphylococcus aureus (39 months in a crowded 18-bed unit and 13 months in a spacious 32-bed unit). Mean length of stay, survival rates, mean birth weights, and other parameters indicated that infant populations in the old and new units were similar. NI rates were not significantly different in the old and new units (11.7% and 9.6%, respectively; p = 0.17) nor were rates of colonization of anterior nares with S. aureus (11.7% and 10.7%; p = 0.5). NI rates, but not S. aureus colonization rates, were significantly higher during months of high patient turnover (p less than 0.01). Sites of infection were similar in the old and new units. There was, however, a significant change in bacterial species causing NI. Klebsiella pneumoniae and Pseudomonas aeruginosa caused 20.4% of NIs in the old unit, but only 2.1% in the new unit (p less than 0.001) and NIs caused by S. epidermidis increased from 4.7% to 14.9% (p = 0.02) in the new unit. There was also a marked decrease in the numbers of clusters of NI occurring in the new unit, indicating that cross-infections between infants were probably minimized.