The goal of this observational study is to learn what can predict the return of the sense of smell in patients with chronic rhinosinusitis with nasal polyps being treated with dupilumab. The main questions it aims to answer are:

1. Does obstruction of the olfactory cleft predict return of the sense of smell?
2. Do electrophysiological signals generated by breathing and sniffing behavior predict return of the sense of smell?

Participants starting dupilumab will undergo assessment for their degree of olfactory cleft obstruction, and an electrophysiologic assessment of their olfactory cleft and be followed over 6 months of treatment with dupilumab.

• Well documented history of CRSwNP
• BSIT age/sex classified as "abnormal" score
• Self-reported stable olfactory deficit of moderate to severe quality > 3 months
• Prior endoscopic sinus surgery >3 months, <10 years prior

Patients with a well documented history of CRSwNP who had prior endoscopic sinus surgery who experience and are assessed to have olfactory deficit.

IPD underlying publication