Right heart structural changes are independently associated with exercise capacity in non-severe COPD

Area of Science:

• Cardiopulmonary Medicine
• Respiratory Medicine
• Clinical Echocardiography

Background:

• Pulmonary hypertension (PH) is common in advanced COPD, causing functional limitations.
• Limited data exists on the functional impact of PH in less severe COPD.
• The association between right heart pathology and functional outcomes in non-severe COPD is unknown.

Purpose of the Study:

• To investigate the relationship between echocardiographic right heart parameters and functional outcomes in patients with non-severe COPD.
• To determine if right heart structural changes are associated with reduced exercise capacity (six-minute walk distance) independent of lung function.

Main Methods:

• Evaluated pulmonary function, six-minute walk distance (6MWD), and echocardiography in 74 consecutive patients with non-severe COPD.
• Utilized multivariable linear regression to assess the association between echocardiographic parameters and 6MWD.
• Adjusted for lung function (FEV1), age, sex, race, and BMI in the analysis.

Main Results:

• Mean 6MWD was 324±106 meters; all subjects had preserved left ventricular systolic function.
• Significant associations were found between right ventricular wall thickness, right atrial enlargement, and lower 6MWD.
• These associations remained significant after adjusting for covariates, including FEV1, indicating independence from lung function.

Conclusions:

• Right-sided cardiac structural changes in non-severe COPD are independently associated with reduced six-minute walk distance.
• Findings suggest echocardiographic evidence of pulmonary hypertension may be present in non-severe COPD.
• These cardiac changes have significant functional consequences, impacting exercise capacity in this patient population.