Modified bronchoscopy masks mitigate aerosols during gastroscopies

Digestive endoscopy has been proven to produce aerosols. This represents a risk of infection by COVID-19 and other airborne viruses. A number of protective barriers have been proposed to minimise that risk. Continuous suction of the oral cavity, shielding barriers, masks, and increasing the distance between patient and endoscopist have been proposed as methods to reduce the exposure of endoscopists and endoscopy staff to aerosols. Here, we present a study that uses modified bronchoscopy masks to attenuate aerosol production at the patient's mouth. We find that this approach offers 47% (p=0.01) reduction in particle count for particles <5um in diameter (i.e. aerosols), which are known to spread SARS-CoV-2.