Healthcare Worker Staffing Ratios Affect Methicillin-Resistant Staphylococcus aureus Acquisition

Area of Science:

• Infectious Disease Epidemiology
• Healthcare Management
• Critical Care Medicine

Background:

• Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant threat in intensive care units (ICUs).
• Optimizing healthcare staffing is crucial for effective infection control and patient outcomes.
• Understanding the impact of staffing variations on MRSA acquisition rates is essential for resource allocation.

Approach:

• A simulation-based study using stochastic compartmental mathematical modeling was employed.
• The model explored variations in nurse-to-patient ratios and intensivist staffing levels.
• Simulations considered both infinite and finite workload conceptualizations over one-year periods, with 1000 repetitions per scenario.

Key Points:

• Reducing nurse-to-patient ratios substantially decreased MRSA acquisitions. A 1:1 ratio led to a 65% reduction in infinite models and an 83% reduction in finite models.
• Finite models showed exponential increases in MRSA with higher patient-to-nurse ratios (e.g., 348% increase for 6:1).
• Variations in intensivist staffing had a comparatively modest impact on MRSA rates.

Conclusions:

• Optimizing nursing staffing levels is critical for controlling MRSA infections in ICUs.
• The impact of staffing on MRSA acquisition is significantly influenced by workload conceptualization (infinite vs. finite).
• Findings provide practical insights for refining ICU staffing protocols to improve infection control outcomes.