Dyspnea is a common presentation in upper and lower airway obstructive causes. However, biphasic stridor and hoarseness should prompt evaluation of the upper airway. Nasendoscopy carried out by the otolaryngology team is a quick and an effective way of evaluating the upper airway.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6787776PMC
http://dx.doi.org/10.1002/ccr3.2366DOI Listing

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