Friberg B, Lindgren M, Karlsson C, Bergström A, Friberg S
Department of Nursing, Umeå University, S-901 87 Umeå, Sweden.
J Hosp Infect. 2002 Apr;50(4):286-92. doi: 10.1053/jhin.2001.1164.
A mobile screen (0.5 x 0.4 m) producing ultra-clean exponential LAF (air-flow central zone 0.6 m/s and peripheral zone 0.4 m/s) was investigated as an addition to conventional turbulent/mixing operating room ventilation. The evaluation was performed during strictly standardized sham operations reflecting conditions during major surgery. The study consisted of a pilot experiment designed to give high counts of sedimenting aerobic colony forming units (cfu). In a second main study, recording dust particles, air-borne and sedimenting aerobic cfu, the screen was associated with optimal operating room clothing. In the pilot experiment the use of the screen resulted in a substantial reduction of sedimenting bacteria from 3835-4940 to 0-390 cfu/m(2)/h. In the main study, the use of the additional LAF reduced the surface contamination from 416-329 to 7-78 cfu/m(2)/h up to 1.6 m from the screen (P=0.001-0.0001). Measured in the wound area the screen reduced the air counts of bacteria from 9-14 to 0.2-0.4 cfu/m(3) (P=0.008-0.0001) and a marked reduction of air-borne dust particles was recorded (P=0.007-0.009). In conclusion, the additional mobile LAF screen reduced the counts of aerobic air-borne and sedimenting bacteria-carrying particles as well as dust particles to the levels gained with complete ultra-clean LAF room ventilation. Thus, the screen might prove a valuable addition to operating room ventilation as well as in other areas where asepsis is essential.
对一个尺寸为0.5×0.4米的移动屏幕进行了研究，该屏幕可产生超净指数层流空气（气流中心区域速度为0.6米/秒，周边区域速度为0.4米/秒），作为传统湍流/混合手术室通风的补充。评估在严格标准化的模拟手术过程中进行，模拟大手术期间的情况。该研究包括一个试点实验，旨在使沉降需氧菌落形成单位（cfu）计数较高。在第二项主要研究中，记录了灰尘颗粒、空气传播和沉降的需氧cfu，该屏幕与最佳手术室着装相关联。在试点实验中，使用该屏幕使沉降细菌数量从3835 - 4940大幅减少至0 - 390 cfu/平方米/小时。在主要研究中，使用额外的层流空气将距离屏幕1.6米范围内的表面污染从416 - 329降低至7 - 78 cfu/平方米/小时（P = 0.001 - 0.0001）。在伤口区域测量，该屏幕使空气中细菌数量从9 - 14减少至0.2 - 0.4 cfu/立方米（P = 0.008 - 0.0001），并记录到空气中灰尘颗粒显著减少（P = 0.007 - 0.009）。总之，额外的移动层流空气屏幕将空气传播和沉降的携带细菌颗粒以及灰尘颗粒数量降低至完全超净层流空气房间通风所达到的水平。因此，该屏幕可能被证明是手术室通风以及其他无菌至关重要的领域的一项有价值的补充。
