In the present study we will compare bacteriological findings and the incidence of SSI in relation to laminar airflow (LAF) ventilated ORs, conventional (also called displacement or mixed) ventilated ORs and conventional ventilated ORs with the addition of tables equipped with units providing a local LAF over the surgical instruments. The hypothesis is that there exist a correlation between number and types of airborne bacteria and bacteria in the surgical wound and on surgical instruments at the time of wound closure.
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Live bacterial Count (colony forming units, CFU) per meter3 air during surgery; in ORs with LAF ventilation, Conventional ventilation or Conventional ventilation + local LAF above instrument tables
Timeframe: 2019-2021
Number of CFU in the surgical wound before closure; after surgery in ORs with LAF ventilation, Conventional ventilation or Conventional ventilation + local LAF above instrument tables
Timeframe: 2019-2021