Chosky S A, Modha D, Taylor G J
From Leicester General Hospital, England, UK.
J Bone Joint Surg Br. 1996 Sep;78(5):835-7.
The use of ultraclean air (UCA) in operating theatres reduces the infection rate after joint replacement but some cases of infection still occur. We investigated one possible source of contamination, namely the setting up of instruments in a conventional plenum-ventilated preparation room. We measured bacterial fallout using agar settle plates and compared instruments set up in the preparation room with those set up in the UCA theatre, assessed the effect of covering instruments after preparation and compared fallout during their preparation with total fallout throughout the operation. Our findings showed that covering the instruments reduced total bacterial fallout fourfold by reducing the exposure time, particularly during periods of increased activity and bacterial dispersal. Preparation in the UCA theatre and subsequent covering of the instruments reduced total fallout 28-fold. All measurable bacterial fallout occurred during the setting up and not during surgery.
在手术室使用超净空气（UCA）可降低关节置换术后的感染率，但仍有一些感染病例发生。我们调查了一个可能的污染源，即在传统的通风顶棚式准备室中摆放器械。我们使用琼脂沉降平板测量细菌沉降，并将在准备室中摆放的器械与在UCA手术室中摆放的器械进行比较，评估准备后覆盖器械的效果，并将器械准备期间的沉降与整个手术过程中的总沉降进行比较。我们的研究结果表明，覆盖器械通过减少暴露时间，特别是在活动增加和细菌扩散期间，使细菌总沉降降低了四倍。在UCA手术室中准备并随后覆盖器械可使总沉降降低28倍。所有可测量的细菌沉降都发生在摆放器械期间，而非手术期间。
