Related Experiment Videos
The operating room environment as affected by people and the surgical face mask
Abstract:
The microbiological counts were determined in an operating room suite of 8 rooms and a hallway. The bacterial counts in an empty operating room jumped statistically from 13 CFU/ft2/hr (+/- 31) to 24.8 (+/- 58.8) when the doors were left open (people in the hallways) and 447.3 (+/- 186.7) when 5 people were introduced. The wearing of a surgical face mask had no effect upon the overall operating room environmental contamination and probably work only to redirect the projectile effect of talking and breathing. People are the major source of environmental contamination in the operating room.
Insights
People significantly increase operating room bacterial counts. Surgical face masks do not reduce overall contamination, suggesting humans are the primary source of operating room microbial spread.
Area of Science:
- Microbiology
- Infection Control
- Environmental Health
Background:
- Operating rooms require stringent microbial control to prevent surgical site infections.
- Understanding sources of microbial contamination is crucial for effective infection prevention strategies.
Purpose of the Study:
- To quantify microbiological contamination in an operating room suite.
- To assess the impact of open doors and human presence on bacterial counts.
- To evaluate the efficacy of surgical face masks in reducing environmental contamination.
Main Methods:
- Microbiological air sampling was conducted in an 8-room operating suite and hallway.
- Bacterial colony-forming units (CFU/ft2/hr) were measured under varying conditions: empty room, doors open with hallway traffic, and with 5 individuals present.
- The effect of surgical face mask usage on contamination levels was assessed.
Main Results:
- Bacterial counts increased from 13 CFU/ft2/hr in an empty room to 24.8 CFU/ft2/hr with open doors and hallway traffic.
- Introducing 5 people dramatically elevated bacterial counts to 447.3 CFU/ft2/hr.
- Surgical face masks showed no significant impact on overall environmental contamination.
Conclusions:
- Human presence is the predominant source of operating room environmental contamination.
- Current surgical face mask protocols may not effectively mitigate airborne microbial spread from personnel.
- Strategies focusing on reducing personnel-generated aerosols are essential for improving operating room air quality.