Diastolic Dysfunction Is a Contributing Factor to Exercise Intolerance in COPD.

Area of Science:

• Cardiology
• Pulmonology
• Medical Imaging

Background:

• Right ventricular (RV) systolic failure is uncommon in COPD, but diastolic dysfunction is prevalent.
• Left ventricular (LV) diastolic dysfunction is also frequent in COPD patients.
• Limited data exist on the impact of diastolic dysfunction on functional capacity in COPD.

Purpose of the Study:

• To investigate the correlation between echocardiographic parameters of RV and LV diastolic function and exercise capacity in COPD patients.
• To assess the influence of diastolic dysfunction on functional capacity using conventional echocardiography and tissue Doppler imaging.

Main Methods:

• Sixty-five COPD patients (GOLD II-IV) underwent echocardiography, including tissue Doppler imaging.
• Measurements included atrial area indices, inferior vena cava collapsibility, mitral/tricuspid inflow parameters (E, A), and annular velocities (S, e', a').
• Functional capacity was assessed using the 6-minute walk test (6MWT).

Main Results:

• Left ventricular diastolic dysfunction was present in 74% of patients.
• Elevated LV and RV filling pressures were observed in 43% and 45% of patients, respectively.
• Tricuspid e'/a' ratio, inferior vena cava collapsibility index, and right atrial area index were independent predictors of 6MWT distance.

Conclusions:

• Right ventricular diastolic function and filling pressures significantly influence functional capacity in COPD.
• Echocardiographic assessment of diastolic function provides valuable insights into exercise limitation in COPD patients.