Olfactory Dysfunction in Chronic Rhinosinusitis with Nasal Polyps: Effect of Treatment with Emphasis on Biological Therapy

Purpose of Review: Olfactory dysfunction significantly impacts quality of life that affects a majority of the patients with chronic rhinosinusitis with nasal polyps (CRSwNP). The aim of this review is to explore the impact of various treatment regimens on olfactory dysfunction in patients diagnosed with CRSwNP. Recent Findings: Accurate assessment of olfactory dysfunction remains challenging and should incorporate both psychophysical tests and patient-reported outcomes. Patients with CRSwNP appear capable of reliably evaluating their olfactory function. Summary: Standard treatment such as intranasal corticosteroids and surgery have limited capability of restoring the sense of smell. Oral corticosteroids have a far greater potency, albeit short-lived and at the cost of adverse events and side effects. Recent studies on registered biological agents– specifically dupilumab, mepolizumab, and omalizumab– indicate their effectiveness in restoring olfactory function in severe CRSwNP. According to meta-analyses and indirect comparisons, dupilumab shows superiority; however, direct comparative studies are necessary. Graphical Abstract: (Figure presented.)