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Respiratory droplet generation and dispersal during nasoendoscopy and upper respiratory swab testing #MMPMID32621399
Tan VYJ; Zhang EZY; Daniel D; Sadovoy A; Teo NWY; Kiong KL; Toh ST; Yuen HW
Head Neck 2020[Oct]; 42 (10): 2779-2781 PMID32621399show ga
Respiratory particle generation and dispersal during nasoendoscopy and swab testing is studied with high-speed video and laser light illumination. Video analysis reveals droplet formation in three manoeuvres during nasoendoscopy - sneezing, vocalization, and nasal decongestion spray. A capillary bridge of mucus can be seen when a nasoendoscope exits wet nares. No droplet formation is seen during oral and nasopharyngeal swab testing. We outline the following recommendations: pull the face mask down partially and keep the mouth covered, only allowing nasal access during nasoendoscopy; avoid nasal sprays if possible; if nasal sprays are used, procedurists should be in full personal protective equipment prior to using the spray; withdrawal of swabs and scopes should be performed in a slow and controlled fashion to reduce potential dispersion of droplets when the capillary bridge of mucus breaks up.