Proposed Etiotypes for Chronic Obstructive Pulmonary Disease: Controversial Issues.

Area of Science:

• Respiratory Medicine
• Pulmonology
• Internal Medicine

Background:

• The 2023 Global Initiative for Chronic Obstructive Lung Disease (GOLD) updated the definition of chronic obstructive pulmonary disease (COPD) to encompass a broader range of etiologies.
• A novel taxonomy based on etiotypes aims to address COPD's heterogeneity in causes and pathogenesis, facilitating personalized management and targeted research.
• Classical COPD is primarily associated with smoking, but the revised definition includes conditions like COPD due to infection (COPD-I) and environmental exposure (COPD-P).

Purpose of the Study:

• To discuss controversial issues surrounding the proposed etiotypes for COPD, specifically COPD-I, COPD-P, and bronchiectasis with airflow limitations.
• To examine whether certain disease entities within the new taxonomy, such as COPD-I and COPD-P, align with conventional COPD treatments and clinical presentations.
• To evaluate the classification of bronchiectasis with airflow limitations as a potential COPD etiotype.

Main Methods:

• Literature review and critical analysis of the 2023 GOLD guidelines and proposed COPD etiotypes.
• Comparative analysis of clinical features and treatment responses for classical COPD versus proposed etiotypes (COPD-I, COPD-P).
• Discussion of the implications of including bronchiectasis with airflow limitations under the COPD umbrella.

Main Results:

• The inclusion of diverse etiologies under the COPD definition highlights the complexity of the disease.
• Some proposed etiotypes, like COPD-I and COPD-P, exhibit distinct clinical features and may not respond to standard COPD therapies, raising classification questions.
• The classification of bronchiectasis with airflow limitations as a COPD etiotype remains a point of contention.

Conclusions:

• The 2023 GOLD update represents a significant step in acknowledging COPD's complexity but introduces classification challenges for related respiratory conditions.
• Further research is essential to refine the understanding and management strategies for the diverse etiotypes of COPD.
• Clarifying the classification of conditions like COPD-I, COPD-P, and bronchiectasis is crucial for developing effective, personalized treatment approaches.