Clinical outcomes of persistent cough following coronavirus disease 2019 infection: A 1-year retrospective cohort study.

Background: Cough is one of the multiple prolonged symptoms observed in patients who had coronavirus disease 2019 (COVID-19) infection. Objective: We assessed the clinical outcomes and identified factors contributing to cough persistence in patients post-COVID-19. Methods: This retrospective cohort study included adults who visited a specialist cough clinic between 2022 and 2023. All participants underwent systematic investigation and treatment for persistent cough. Cough persistence was assessed at the 2- and 12-month follow-ups. Participants were classified as having persistent cough if they had a current troublesome cough at the 2- and 12-month follow-ups, and a cough severity visual analog scale (VAS) score change below 30. Results: Sixty-six patients (mean age 48.7 years; 72.7% women) were analyzed and divided into 2 groups: persistent cough (33.3%) and remitted cough (66.7%). The persistent cough group had a significantly higher prevalence of abnormal laryngeal sensation, sputum production, breathing difficulty, and airway eosinophilia; their VAS score changes at 2 months were also lower. Multivariable analyses indicated associations between persistent cough at 1 year and factors such as airway eosinophilia (adjusted odds ratio [aOR], 6.78), abnormal laryngeal sensation (aOR, 6.42), and low cough VAS reduction (aOR, 1.05). Conclusion: Persistent cough remained a significant issue for one-third of the patients after COVID-19. The clinical features commonly observed in chronic cough were also present in those who have experienced COVID-19, which contributed to prolonged cough. These findings underscore the need for systematic assessment and tailored treatment strategies to effectively manage persistent cough in patients post-COVID-19.