OR Air Change Setbacks Do Not Increase Postoperative Infection or Mortality
Overview
A retrospective study of 127,878 surgeries across 55 operating rooms found that reducing ventilation rates during unoccupied periods did not increase surgical site infections or mortality. The intervention also led to substantial energy and cost savings without compromising patient outcomes.
Background
Operating room ventilation is critical for infection control, typically maintained at high air change rates during surgeries. However, continuous high ventilation when rooms are unoccupied may lead to unnecessary energy consumption. This study evaluated whether automated reductions in air changes per hour during unoccupied periods affect postoperative outcomes such as surgical site infections, ICU admissions, mortality, and length of stay.
Data Highlights
Outcome
Pre-Implementation
Post-Implementation
Superficial SSI
8.7%
7.8%
Deep SSI
0.8%
0.5%
30-day Mortality
1.7%
1.5%
90-day Mortality
3.2%
2.9%
Median Length of Stay
Not specified
Slightly shorter
Annual Electricity Consumption Reduction
~1.35 million kWh
Annual Cost Savings
~$135,000
Key Findings
Reducing ventilation to 4-6 air changes per hour during unoccupied OR periods did not increase surgical site infections.
Unadjusted data showed slight decreases in superficial and deep SSIs post-implementation.
There were small reductions in 30-day and 90-day mortality rates after ventilation setbacks.
Adjusted analyses found no significant differences in SSI, ICU admissions, or 30-day mortality.
Median hospital length of stay was slightly shorter following the intervention.
Energy consumption decreased by approximately 1.35 million kWh annually, saving nearly $135,000 in electricity costs.
Clinical Implications
Implementing automated ventilation setbacks during unoccupied periods in operating rooms can reduce energy use and costs without compromising patient safety or increasing infection risk. These findings support optimizing ventilation strategies within existing guidelines to improve sustainability in surgical environments.
Conclusion
Reduced ventilation rates during unoccupied operating room periods appear safe and effective in lowering energy consumption without adversely affecting postoperative outcomes. Further studies may help validate these findings across diverse clinical settings.
References
Alipouriani et al., JAMA Surgery -- Impact of Operating Room Air Change Setbacks on Postoperative Outcomes
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