Kruppa B, Rüden H
Institut für Hygiene, Freien Universität Berlin.
Zentralbl Hyg Umweltmed. 1993 May;194(3):236-46.
The question was if a reduction of airborne particles and bacteria in conventionally (turbulently), ventilated operating theatres in comparison to Laminar-Airflow (LAF) operating theatres does occur at high air-exchange-rates. Within the framework of energy consumption measures the influence of air-exchange-rates on airborne particle and bacteria concentrations was determined in two identical operating theatres with conventional ventilation (wall diffusor panel) at the air-exchange-rates 7.5, 10, 15 and 20/h without surgical activity. This was established by means of the statistical procedure of analysis of variance. Especially for the comparison of the air-exchange-rates 7.5 and 15/h statistical differences were found for airborne particle concentrations in supply and ambient air. Concerning airborne bacteria concentrations no differences were found among the various air-exchange-rates. Explanation of variance is quite high for non-viable particles (supply air: 37%, ambient air: 81%) but negligible for viable particles (bacteria) with values below 15%.
问题在于，在高换气率情况下，与层流手术室相比，传统（紊流）通风手术室中的空气传播颗粒和细菌数量是否会减少。在能耗测量框架内，在两个相同的采用传统通风（壁式扩散板）的手术室中，于无手术活动时，以7.5、10、15和20次/小时的换气率测定换气率对空气传播颗粒和细菌浓度的影响。这是通过方差分析的统计程序确定的。特别是在比较7.5次/小时和15次/小时的换气率时，发现送风及环境空气中的空气传播颗粒浓度存在统计学差异。关于空气传播细菌浓度，在不同换气率之间未发现差异。对于无生命颗粒（送风：37%，环境空气：81%），方差解释相当高，但对于有生命颗粒（细菌），其值低于15%，可忽略不计。
