有高强度人员流动的 CT 室中屏蔽紫外线杀菌照射的抗菌效果。
The antimicrobial efficacy of shielded ultraviolet germicidal irradiation in CT rooms with intense human circulation.
机构信息
Department of Radiology, University of Health Sciences, Istanbul Fatih Sultan Mehmet Training and Research Hospital, İstanbul, Turkey.
Department of Medical Microbiology, University of Health Sciences, Istanbul Fatih Sultan Mehmet Training and Research Hospital, İstanbul, Turkey.
出版信息
Diagn Interv Radiol. 2021 Mar;27(2):293-301. doi: 10.5152/dir.2021.20688.
PURPOSE
Computed tomography (CT) premises are one of the strategic points in the spread of hospital-acquired infections. Ultraviolet germicidal irradiation (UVGI) is an effective method that could potentially be used to purify the ambient air in them. However, it cannot be directly used in the presence of humans and, therefore, it is not operationally suitable in such units with continuous human circulation. Newer devices have been developed to purify air with more efficient and shielded UV-C sources. This study aims to assess the microbial air contamination in CT scanning rooms and investigates the efficacy and technical considerations of shielded UV-C arrays.
METHODS
Two shielded UVGI systems, each equipped with 15 Watt UV-C LED arrays, were tested in a very busy CT unit. Initially, a pilot study was performed to determine ambient microorganisms under routine conditions before UVGI installation, followed by three basic scenarios of UVGI use under normal and abnormal conditions: A, UVGI, with both air-conditioning (AC) and ventilation on; B, UVGI, with AC on and ventilation off; C, UVGI, with both AC and ventilation off. Ambient air was sampled in various time points before and after the initialization of UV irradiation and analyzed for colony formation.
RESULTS
The mean total colony count in the pilot study was 1360±450 CFU/m3. Pre-UVGI colony count was 3510 CFU/m3 for Scenario A, ~10000 CFU/m3 for Scenario B and 990 CFU/m3 for Scenario C. Thirty minutes after UVGI, total colony counts in all three scenarios dropped to 30 to 70 CFU/m3. Under normal operating conditions and UVGI, the mean colony count was found as 21.4±13.5 CFU/m3 and the average efficacy of the UVGI was found as 99.39%.
CONCLUSION
This study identified substantial microbial air contamination in CT scanning rooms during normal and abnormal operating conditions. UV-C LED arrays effectively eliminate these microbiological contaminants. This effect is also observed under abnormal operating conditions where no other means of ventilation or air conditioning exists.
目的
计算机断层扫描（CT）机房是医院获得性感染传播的战略要点之一。紫外线杀菌（UVGI）是一种有效的方法，有可能用于净化环境空气。然而，它不能在有人的情况下直接使用，因此在人员持续流动的此类单位中不适合操作。已经开发出更新的设备来净化空气，使用更高效和屏蔽的 UV-C 源。本研究旨在评估 CT 扫描室的微生物空气污染，并研究屏蔽 UV-C 阵列的功效和技术考虑因素。
方法
在一个非常繁忙的 CT 单元中测试了两个带有 15 瓦 UV-C LED 阵列的屏蔽 UVGI 系统。最初，在安装 UVGI 之前进行了一项试点研究，以确定常规条件下的环境微生物，然后在正常和异常条件下进行了三种基本的 UVGI 使用情况：A、UVGI，空调（AC）和通风均开启；B、UVGI，仅开启 AC，关闭通风；C、UVGI，同时关闭 AC 和通风。在初始化 UV 照射前后的不同时间点采集环境空气样本，并进行菌落形成分析。
结果
试点研究中总菌落计数的平均值为 1360±450 CFU/m3。情景 A 的预 UVGI 菌落计数为 3510 CFU/m3，情景 B 约为 10000 CFU/m3，情景 C 为 990 CFU/m3。UVGI 后 30 分钟，三种情况下的总菌落计数均降至 30 至 70 CFU/m3。在正常运行条件和 UVGI 下，平均菌落计数为 21.4±13.5 CFU/m3，UVGI 的平均功效为 99.39%。
结论
本研究在正常和异常运行条件下发现 CT 扫描室存在大量微生物空气污染。UV-C LED 阵列可有效消除这些微生物污染物。在没有其他通风或空调手段的异常运行条件下也观察到这种效果。
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