Assessing the Utility of Outlet Filters in the Ventilators of ICU Patients

Akshita Lalendran; Aditya Lal Vallath; Abhijeet Mane; KK Lahiri

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Assessing the Utility of Outlet Filters in the Ventilators of ICU Patients

机译：评估ICU患者呼吸机中出口过滤器的效用

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Intensive Care Units (ICU) host a large percentage of all nosocomial infections in any hospital. The air quality in such an environment plays a pivotal role in the dissemination of such infections. Ventilated patients expel aerosols containing nosocomial infectious agents from the ventilator.Aim: To assess the value of placing a Heat and Moisture Exchanger (HME) filter at the outlet of ventilators to reduce the Total Viable Count (TVC) in the air and improve air quality.Materials and Methods: The study was conducted in two phases, of which Phase I was conducted without a filter and Phase II was conducted after placing HME filters in the outlet of the ventilators; while sampling locations remained the same. In both phases, active and passive sampling was done on a total of 120 samples which included 60 samples from each phase. The index of microbiological air contamination (passive sampling) and surface air sample TVC (active sampling) were calculated to assess the level of microbiological contamination.Results: The mean results of passive sampling were 1547.41 CFU/dm2/hour in phase I and 761.49 CFU/dm2/hour in phase II. In active sampling, the mean results were 88.48 CFU/m3 in Phase I and 51.71 CFU/m3 in Phase II.Conclusion: The placement of HME filters at the outlet of ventilators has significantly reduced TVC counts in both active and passive sampling in Phase II using the filters as compared to Phase I. Other measures should be undertaken to further reduce TVC counts to accepted safety standards.

机译：重症监护病房（ICU）在任何医院中都占所有医院感染的很大一部分。在这种环境中，空气质量在传播此类感染中起着举足轻重的作用。通风的患者从呼吸机中排出含有医院感染因子的气雾剂。目的：评估在呼吸机的出口处放置热湿交换器（HME）过滤器以减少空气和空气中总生存量（TVC）的价值。材料和方法：研究分两个阶段进行，其中第一阶段在不使用过滤器的情况下进行，第二阶段在将HME过滤器放置在通风机的出口后进行;而采样位置保持不变。在这两个阶段中，对总共120个样本进行了主动和被动采样，其中包括每个阶段的60个样本。计算微生物空气污染指数（被动采样）和地表空气样本TVC（主动采样）的指标，以评估微生物污染水平。结果：第一阶段被动采样的平均结果为1547.41 CFU / dm2 /小时第二阶段为761.49 CFU / dm2 /小时。在主动采样中，第一阶段的平均结果为88.48 CFU / m3，第二阶段为51.71 CFU / m3。结论：在呼吸机出口处放置HME过滤器可显着减少主动和被动采样中的TVC计数与第一阶段相比，在第二阶段中使用了过滤器。应采取其他措施，以进一步将TVC数量减少到可接受的安全标准。

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《Journal of Clinical and Diagnostic Research》 |2019年第2期|共6页
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Akshita Lalendran; Aditya Lal Vallath; Abhijeet Mane; KK Lahiri;
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Assessing the Utility of Outlet Filters in the Ventilators of ICU Patients

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