Screening for Obstructive Respiratory Disorders in the General Population During the "Mai Poumon 2026" Prevention Campaign: Prevalence and Impact on the Care Pathway

Chronic Obstructive Pulmonary Disease (COPD), a chronic bronchial disease characterized by irreversible airway obstruction, represents a major public health issue. It is currently the fifth leading cause of death worldwide and, according to the World Health Organization (WHO), is expected to become the third leading cause by 2030. Diagnosis is currently based on spirometry, which reveals an obstructive ventilatory disorder (OVD) defined by a forced expiratory volume in one second (FEV1) to forced vital capacity (FVC) ratio of less than 0.7. However, limited access to this examination can make the diagnosis of COPD difficult. Undiagnosed COPD represents a significant issue in terms of morbidity and mortality, as nearly 50% of smokers with chronic respiratory symptoms also experience impaired quality of life and acute events similar to COPD exacerbations. A French study involving 424 patients hospitalized for a COPD exacerbation found that 21.9% had not been diagnosed previously, meaning they entered the disease during a severe exacerbation. The main challenge, therefore, lies in the early identification of COPD patients, particularly through the use of validated self-questionnaires (e.g., Haute Autorité de Santé). We aim to study the prevalence of airflow obstruction (AO) and PRISm (preserved ratio impaired spirometry) in the general population. The secondary objectives are: to compare the clinical characteristics of patients with and without AO / with and without PRISm (depending on sample size). To identify risk factors for AO and/or PRISm (depending on sample size) (female sex, advanced age, BMI, active smoking, respiratory symptoms). To estimate the prevalence of "undiagnosed" subjects, defined as the presence of OVD without any known respiratory history, and to study their clinical characteristics. We plan to follow up with participants at 6 months through a telephone contact to assess the practical impact of this screening day and to determine the proportion of those who have received a consultation with a general practitioner, a pulmonologist, or the introduction of a treatment.

• Description of the clinical characteristics of patients with and without Airflow Obstruction / with and without PRISm [Time frame: At the day of inclusion]
• Description of the population participating to the prevention campaing [Time frame: At the day of inclusion]
• Evaluation of the number of patients diagnosed with airflow obstruction or Prism and who attend a consult with a medical doctor after the prevention campain [Time frame: At Month 6]