This study aims to evaluate the pre-post smoke evacuation uses on surgical smoke and bio-aerosols particles in operating rooms at a university hospital, Thailand.
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The amount of surgical smoke and bio-aerosols' particles in the Head, Neck & Breast/ Laparoscopic abdominal surgical field will be measured by AeroTraxTM Handheld Airborne Particle Counter Model 930
Timeframe: Operating time, about 1- 3 hours