Aerosol protection using modified N95 respirator for upper gastrointestinal endoscopy: a randomized control trial

INTERVENTION: Experimental Device,No Intervention No treatment Modified N95,Control We created two perpendicular 10.4‐mm slit through N95 respirator (3M Aura, 1870+) for endoscopic shaft insertion. Patients in this group will wear this modified N95 before receiving procedure. Particle will be counted before and after procedure.,Patients in this group will receive routine upper gastrointestinal endoscopy. Particle will be counted before and after procedure. CONDITION: Patients receiving upper gastrointestinal endoscopy ; Upper gastrointestinal endoscopy, N95, Particle count, Aerosol Upper gastrointestinal endoscopy, N95, Particle count, Aerosol PRIMARY OUTCOME: Particle count after finish procedure TSI aerotrak handheld particle SECONDARY OUTCOME: Particle size after finish procedure TSI aerotrak handheld particle,Duration of procedure after finish procedure minutes INCLUSION CRITERIA: Patients receiving upper gastrointestinal endoscopy with negative result of RT‐PCR for COVID‐19 within 48 hours prior to procedure