Cardiopulmonary Exercise Testing With Simultaneous Echocardiography After Pulmonary Embolism

Area of Science:

• Cardiology
• Pulmonary Medicine
• Diagnostic Imaging

Background:

• Standard cardiopulmonary exercise testing (CPET) is recommended for symptomatic patients post-pulmonary embolism (PE).
• However, CPET combined with echocardiography may offer deeper insights into right ventricular-pulmonary arterial (RV-PA) coupling.
• Persistent symptoms after PE treatment warrant further investigation into RV function and RV-PA interactions.

Purpose of the Study:

• To investigate exercise-induced changes in echocardiographic variables of RV function and RV-PA coupling.
• To assess RV-PA coupling in patients with residual thrombotic defects 3 months post-PE.
• To evaluate the utility of combined CPET and echocardiography in early assessment of post-PE patients.

Main Methods:

• Retrospective study of 45 patients with residual thromboembolic disease and persistent symptoms post-PE.
• Patients underwent simultaneous CPET and Doppler echocardiography at rest and during exercise.
• Analysis focused on exercise-induced changes in RV function parameters like TAPSE and RV-PA coupling indicators.

Main Results:

• Peak tricuspid annular plane systolic excursion (TAPSE) correlated significantly with peak workload, peak VO2, VE/VECO2 (AT), and oxygen pulse.
• The change in TAPSE from rest to peak exercise correlated significantly with peak oxygen uptake.
• Reduced VO2 at anaerobic threshold (AT) and TAPSE/pulmonary artery systolic pressure (PASP) were observed in patients who developed chronic thromboembolic pulmonary hypertension (CTEPH).

Conclusions:

• CPET with simultaneous echocardiography is a valuable tool for assessing RV function and RV-PA coupling in symptomatic patients post-PE.
• This combined approach can help identify patients with residual RV dysfunction or impaired RV-PA coupling.
• It may aid in the early detection of complications like CTEPH in patients with persistent symptoms and perfusion defects.