Performance of the surface air system air samplers

Lach, V.H.

doi:10.1016/s0195-6701(85)80026-8

Cited by 45 publications

(17 citation statements)

References 5 publications

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“…To relate the deposition to the bioaerosol concentration in the air requires taking air samples. While this is straightforward, [17] it is well documented that sampler efficiencies are far from 100%, with some estimated to sample well below 50% of the viable concentration in the air [42]. The settle plate approach used to measure deposition is unlikely to experience microbial losses due to physical damage from impaction that is present in an air sampler, but may still underestimate total counts as it is based on colony formation after incubation.…”

Section: Implications Of Resultsmentioning

confidence: 99%

Bioaerosol deposition in single and two-bed hospital rooms: A numerical and experimental study

King

Noakes

Sleigh

et al. 2013

Building and Environment

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Abstract:Aerial dispersion of pathogenic microorganisms and subsequent contamination of surfaces is well recognised as a potential transmission route for hospital acquired infection. Simulation approaches such as computational fluid dynamics (CFD) are increasingly used to model Results for all layouts demonstrate that small particle bioaerosols are deposited throughout a room with no clear correlation between relative surface concentration and distance from the source. However, a physical partition separating patients is shown to be effective at reducing cross-contamination of neighbouring patient zones.

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Section: Implications Of Resultsmentioning

confidence: 99%

Bioaerosol deposition in single and two-bed hospital rooms: A numerical and experimental study

King

Noakes

Sleigh

et al. 2013

Building and Environment

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“…Bacterial and fungal contamination of air and surfaces was determined on days 1, 15, and 60 of each randomization period. Air contamination was assessed separately for the central corridor and individual patient's rooms with a surface air system sampler (PBI International) equipped with 36-cm 2 Petri dishes, 18 each containing culture medium specific for different strains. In each sampling procedure, 180 L air was aspirated over 120 seconds far from surfaces and human bodies at a constant height of 1.5 m from the floor.…”

Section: Data Collectionmentioning

confidence: 99%

Reduced Cardiocirculatory Complications With Unrestrictive Visiting Policy in an Intensive Care Unit

et al. 2006

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Background-Observational studies suggest that open visiting policies are preferred by most patients and visitors in intensive care units (ICUs), but no randomized trial has compared the safety and health outcomes of unrestrictive (UVP) and restrictive (RVP) visiting policies. The aim of this pilot, randomized trial was to compare the complications associated with UVP (single visitor with frequency and duration chosen by patient) and RVP (single visitor for 30 minutes twice a day). Methods and Results-Two-month sequences of the 2 visiting policies were randomly alternated for 2 years in a 6-bed ICU, with 226 patients enrolled (RVP/UVP, nϭ115/111). Environmental microbial contamination, septic and cardiovascular complications, emotional profile, and stress hormones response were systematically assessed. Patients admitted during the randomly scheduled periods of UVP received more frequent (3.2Ϯ0.2 versus 2.0Ϯ0.0 visits per day, meanϮSEM) and longer (2.6Ϯ0.2 versus 1.0Ϯ0.0 h/d) visits (PϽ0.001 for both comparisons). Despite significantly higher environmental microbial contamination during the UVP periods, septic complications were similar in the 2 periods. The risk of cardiocirculatory complications was 2-fold (odds ratio 2.0; 95% CI, 1.1 to 3.5; Pϭ0.03) in the RVP periods, which were also associated with a nonsignificantly higher mortality rate (5.2% versus 1.8%; Pϭ0.28). The UVP was associated with a greater reduction in anxiety score and a significantly lower increase in thyroid stimulating hormone from admission to discharge. Conclusions-Despite

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“…Other samplers using a sieve to distribute the airflow over the Petri dish have sieves with more holes: 394 holes in the Samplair AES (Nesa et al, 2001), 400 holes in the Andersen (1958) sampler, 401 holes in the SAS Sampler (Lach, 1985), and 657 holes in the Bio Samp MBS-100 Midore Azen (Shintani et al, 2004). Sieve impaction is based on the aspiration of air through small holes at the top of the sampler.…”

Section: Discussionmentioning

confidence: 99%