Chronotropic incompetence predicts mortality in severe obstructive pulmonary disease

Area of Science:

• Cardiology
• Pulmonology
• Autonomic Neuroscience

Background:

• Autonomic dysfunction is common in severe chronic obstructive pulmonary disease (COPD).
• Chronotropic incompetence (CI), a marker of autonomic dysfunction, may impact COPD prognosis.
• Evaluating CI's prognostic value is crucial for managing severe COPD patients.

Purpose of the Study:

• To determine the prevalence of chronotropic incompetence (CI) in severe COPD patients.
• To assess the prognostic significance of CI in predicting adverse events in this population.

Main Methods:

• Retrospective analysis of 449 severe COPD patients undergoing cardiopulmonary exercise testing.
• Exclusion criteria included lung volume reduction surgery, left ventricular dysfunction, and non-sinus rhythm.
• CI defined as percent predicted heart rate reserve (%HRR); events as death or lung transplant over 68 months median follow-up.

Main Results:

• Median %HRR was 33% in patients with severe COPD.
• The lowest quartile of %HRR showed a 3.2-fold increased hazard ratio for adverse events (p<0.001).
• %HRR independently predicted outcomes in multivariate regression analysis.

Conclusions:

• Chronotropic incompetence (CI) is prevalent in severe COPD.
• CI, measured by %HRR, is an independent and powerful predictor of mortality and lung transplant in severe COPD patients.
• Autonomic dysfunction assessed via CI holds significant prognostic value in COPD management.