Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA; University of California - Berkeley, Center for the Built Environment, CA 94720, USA.
University of California - Berkeley, Center for the Built Environment, CA 94720, USA.
J Infect Public Health. 2018 Sep-Oct;11(5):631-635. doi: 10.1016/j.jiph.2018.02.007. Epub 2018 Mar 8.
Operating rooms (ORs) are usually over-pressurized in order to prevent the penetration of contaminated air and the consequent risk of surgical site infection. However, a door-opening can result in the rapid disappearance of pressure and contaminants can then easily penetrate into the surgical zone. Therefore, a broad knowledge and understanding of OR ventilation systems and their protective potential is essential for optimizing the surgical environment.
This study investigated the air quality and level of airborne particles during a single and multiple door-opening cycles in an operating room supplied by a turbulent-mixing ventilation system.
The exploration was carried out numerically using computational fluid dynamics. Model validation was performed to ensure the validity of the achieved results. The OR was initially over-pressurized by approximately 15Pa, relative to the adjacent corridors. Both sliding and hinged doors were simulated and compared.
Penetration of bacteria carrying particles from the corridors to the OR can be successfully restricted by using a positive-pressure system. However, the results clearly indicate that frequent door opening can interfere with airflow ventilation systems, alter the pressure gradient, and increase the infection risk for the patient undergoing surgical intervention. Door-opening disturbs the airflow field and could result in containment failure.
为了防止污染空气的渗透和由此导致的手术部位感染的风险，手术室通常会超压。然而，开门会导致压力迅速下降，污染物很容易渗透到手术区域。因此，广泛了解和理解手术室通风系统及其保护潜力对于优化手术环境至关重要。
本研究调查了在由紊流混合通风系统供应的手术室中进行单次和多次开门循环时的空气质量和空气传播颗粒水平。
使用计算流体动力学进行了探索。进行了模型验证以确保获得的结果的有效性。手术室最初相对于相邻走廊超压约 15Pa。模拟并比较了滑动门和铰链门。
使用正压系统可以成功限制携带细菌的颗粒从走廊渗透到手术室。然而，结果清楚地表明，频繁开门会干扰气流通风系统，改变压力梯度，并增加接受手术干预的患者的感染风险。开门会扰乱气流场并可能导致失封。
