title: [The effect of the ventilation rate on air particle and air microbe concentration in operating rooms with conventional ventilation. 1. Measurement without surgical activity].
abstract: The question was if a reduction of airborne particles and bacteria in conventionally (turbulently), ventilated operating theatres in comparison to Laminar-Airflow (LAF) operating theatres does occur at high air-exchange-rates. Within the framework of energy consumption measures the influence of air-exchange-rates on airborne particle and bacteria concentrations was determined in two identical operating theatres with conventional ventilation (wall diffusor panel) at the air-exchange-rates 7.5, 10, 15 and 20/h without surgical activity. This was established by means of the statistical procedure of analysis of variance. Especially for the comparison of the air-exchange-rates 7.5 and 15/h statistical differences were found for airborne particle concentrations in supply and ambient air. Concerning airborne bacteria concentrations no differences were found among the various air-exchange-rates. Explanation of variance is quite high for non-viable particles (supply air: 37%, ambient air: 81%) but negligible for viable particles (bacteria) with values below 15%.
authors.affiliation: Institut für Hygiene, Freien Universität Berlin.
authors.forename: B
authors.initials: B
authors.lastname: Kruppa
authors.forename: H
authors.initials: H
authors.lastname: Rüden
mesh_terms: D000391:Air Microbiology; D016902:Air Pollution, Indoor; D000704:Analysis of Variance; D001419:Bacteria / Q000254:growth & development*; D015169:Colony Count, Microbial; D004780:Environment, Controlled; D009873:Operating Rooms; D014691:Ventilation
vernacular_title: Der Einfluss der Luftwechselzahl auf Luftpartikel- und Luftkeimkonzentrationen in Operations-Räumen mit konventioneller Belüftung. 1. Mitteilung: Messungen ohne Operations-Betrieb.