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Reduction of airborne bacterial burden in the OR by installation of unidirectional displacement airflow (UDF) systems.

Author(s) : FISCHER S., THIEVES M., HIRSCH T., et al.

Type of article: Article

Summary

Intraoperative bacterial contamination IS a major risk factor for postoperative wound infections. This study investigated
the Influence of type of ventilation system on intraoperative airborne bacterial burden before and after installation of unidirectional displacement air flow systems. We microbiologically monitored 1286 surgeries performed by a single surgical team that moved from operating rooms (ORs) equipped with turbulent mixing ventilation (TMV, according 10 standard DlN-1946-4 [1999]. ORs 1, 2, and 3) to ORs with unidirectional displacement airflow (UDF, according to standard DlN-1946-4 , annex D [2008]. ORs 7 and 8). The airborne bacteria were collected intraoperatively with sedimentation plates, Alter incubation for 48 h, we analysed the average number of bacteria per h, peak values, and correlation to surgery duration, In addition, we compared the last 138 surgeries In ORs 1-3 With the first 138 surgeries In ORs 7 and 8. intraoperative airborne bacterial burden was 5.4 CFU/h, 5.5 CFU/h, and 6.1 CFU/h In ORs 1,2, and 3, respectively. Peak values of burden were 10.7 CFU/h, 11.1 CFU/h, and 11.0 CFU/h In ORs I, 2, and 3, respectively). With the UDF system, the intraoperative airborne bacterial burden was reduced to 0.21 CFU/h (OR 7) and 0.35 CFU/h (OR 8) on average (p<0.01). Accordingly, peak values decreased to 0.9 CFU/h and 1.0 CFU/h in ORs 7 and 8, respectively (p<0.01). Airborne bacterial burden Increased linearly with surgery duration in ORs 1-3, but the UDF system In ORs 7 and 8 kept bacterial levels constantly low (<3 CFU/h). A comparison of the last 138 surgeries before with the first 138 surgeries after changing ORs revealed a 94% reduction In average airborne bacterial burden (5 CFU/h vs. 0.29 CFU/h. p<0.01). The unidirectional displacement airflow, which fulfils the requirements of standard D1N·1946-4 annex 0 of 2008, is an effective
ventilation system that reduces airborne bacterial burden under real clinical conditions by more than 90%, Although decreased
postoperative wound Infection incidence was not specifically assessed, II is clear that airborne microbiological burden contributes to surgical infections.

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Pages: 90-97

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Details

  • Original title: Reduction of airborne bacterial burden in the OR by installation of unidirectional displacement airflow (UDF) systems.
  • Record ID : 30018378
  • Languages: English
  • Source: EcoLibrium - vol. 15 - n. 4
  • Publication date: 2016/05

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