Chronic Obstructive Pulmonary Disease and Cardiac Repolarization: Data from a Randomized Controlled Trial.

Area of Science:

• Cardiology
• Pulmonology
• Thoracic Surgery

Background:

• Altered cardiac repolarization is a risk factor for sudden cardiac death.
• Patients with chronic obstructive pulmonary disease (COPD) exhibit increased risks for altered cardiac repolarization.

Purpose of the Study:

• To investigate the effect of lung volume reduction surgery (LVRS) on cardiac repolarization and dispersion in severe COPD patients.
• To determine if LVRS improves QTc interval and QT dispersion in COPD patients.

Main Methods:

• A randomized controlled trial involving 30 patients with severe COPD scheduled for LVRS.
• Measurements of cardiac repolarization (QTc interval, QT dispersion) using electrocardiography were taken 3 months post-LVRS.
• Univariable and multivariable analyses were performed to identify confounders.

Main Results:

• LVRS significantly improved lung function, with a mean decrease in residual volume/total lung capacity of -9 ± 11% and an increase in forced expiratory volume in 1 s of +30 ± 29%.
• LVRS did not significantly reduce QTc interval (median -5.3 ms) or QT dispersion (median -3.0 ms) compared to the control group.
• No significant associations were found between changes in repolarization measures and potential confounders.

Conclusions:

• LVRS does not appear to affect cardiac repolarization in COPD patients.
• Lung hyperinflation may not be a direct causal factor for altered cardiac repolarization in COPD.
• Further research is needed to understand the relationship between COPD and cardiac repolarization abnormalities.