Exercise-Induced Electrocardiography Changes in Pulmonary Arterial Hypertension

Area of Science:

• Cardiology
• Pulmonology
• Exercise Physiology

Background:

• Cardiopulmonary exercise testing (CPET) assesses functional capacity in pulmonary arterial hypertension (PAH).
• Electrocardiography (ECG) during CPET monitors for exercise-induced ischemia or arrhythmia.
• The predictive value of ECG changes for clinical worsening in PAH requires further investigation.

Purpose of the Study:

• To determine if ECG changes during CPET predict adverse outcomes in pediatric and young adult PAH patients.
• To investigate the association between exercise-induced ST-T-wave changes and hemodynamic parameters in PAH.
• To identify ECG changes as potential early indicators of clinical deterioration in PAH.

Main Methods:

• Retrospective analysis of clinical, hemodynamic, and CPET data from 155 PAH patients (ages 7-40).
• ECGs were analyzed for ST depressions and T-wave inversions during CPET.
• Adverse outcomes were categorized as severe (death/lung transplant) or moderate (medication escalation/hospitalization).

Main Results:

• 41% of patients experienced at least one adverse outcome over a median 5-year follow-up.
• 25% of patients showed significant ST-T-wave changes during exercise.
• ST-T-wave changes were associated with a 20% increased likelihood of death or lung transplant and correlated with elevated mean pulmonary arterial pressure (mPAP).

Conclusions:

• Exercise-induced ST-T-wave changes are significant predictors of adverse outcomes in PAH patients.
• These ECG findings correlate with higher mPAP, suggesting they reflect disease severity.
• ECG monitoring during CPET may serve as an early warning system for clinical worsening in PAH.