The degree of protection (DP) at the center of the protected area was higher for the case with the skirt. This skirt stimulates more down flow and prevents the early entry of particles into the protected area. It can also be concluded that Lamp Y, due to its open shape, has the most positive effect on the DP at the center. It has also been shown that the position of the lamp has an effect on the protected area.

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Keywords:Ceiling-mounted system Hybrid operating theatre cfu/m 3 Air quality Hybrid operating room UDF system S U M M A R Y Background: Large imaging systems in hybrid operating rooms are used increasingly. However, the effect of these ceiling-mounted imaging systems on air quality during surgical procedures has not been studied to date. Aim: To evaluate the level of colony-forming units (cfu)/m 3 near the surgical wound and near the instrument table during surgery. Methods: Measurements were performed in four hybrid operating rooms at four different hospitals. During surgical procedures, at least three samples were taken with active slit air samplers. At the end of the day's surgical schedule, simulations involving movement of the ceiling-mounted system were also performed. The threshold value for the average cfu level during a surgical procedure was set at 10 cfu/m 3 , and for individual samples was set at 30 cfu/m 3 . Results: The median value near the surgical wound was 1 cfu/m 3 and at the instrument table was 2 cfu/m 3 . However, in one hybrid operating room (two procedures out of 16) where the instrument table was not positioned directly under the unidirectional flow (UDF) system, the threshold value for the average cfu level at the instrument table was exceeded. For one of these procedures, the maximum value for an individual sample was also exceeded. Conclusions: A ceiling-mounted imaging system in combination with a UDF system can result in cfu levels near the surgical wound and at the instrument table that are well below the threshold value of 10 cfu/m 3 during surgery. If the instrument table is not positioned directly under the UDF system, the cfu level is higher.

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