Airflow Obstruction and Cardio-metabolic Comorbidities

Area of Science:

• Pulmonology and Cardiology
• Epidemiology of Chronic Diseases

Background:

• Chronic obstructive pulmonary disease (COPD) frequently co-occurs with cardiovascular disease (CVD), hypertension, and diabetes.
• Understanding the relationship between airflow obstruction and these common comorbidities is crucial for public health.

Purpose of the Study:

• To investigate the association between airflow obstruction and the prevalence of CVD, hypertension, and diabetes in a large international cohort.
• To determine if common risk factors explain the observed comorbidities in COPD patients.

Main Methods:

• Utilized data from 23,623 participants across 33 centers in the Burden of Obstructive Lung Disease (BOLD) initiative.
• Defined airflow obstruction using post-bronchodilator FEV1/FVC < 5th percentile, with adjustments for age, sex, smoking, BMI, and education.
• Employed meta-analysis to combine results across centers, assessing heterogeneity using the I²-statistic.

Main Results:

• Crude analysis showed associations between airflow obstruction and CVD (OR 1.42) and hypertension (OR 1.24).
• After multivariable adjustment, the association with CVD (OR 1.00) and hypertension (OR 1.14) was attenuated, largely explained by age and smoking.
• A significant inverse association was found between airflow obstruction and diabetes (adjusted OR 0.76), indicating a lower risk.

Conclusions:

• The coexistence of CVD and hypertension with airflow obstruction in the general population is largely attributable to shared risk factors like age and smoking.
• Individuals with airflow obstruction exhibit a reduced risk of diabetes.
• These findings highlight the importance of considering common risk factors in the management of patients with COPD and cardio-metabolic conditions.