Exercise as an end-point in pulmonary hypertension trials

Area of Science:

• Cardiology
• Pulmonary Medicine
• Clinical Trials

Background:

• Current clinical markers for pulmonary hypertension (PH) progression are outdated.
• Existing markers like resting right heart pressures lack linearity with disease severity.
• The 6-minute walk test is a common but limited measure of PH progression.

Purpose of the Study:

• To review current clinical endpoints used in pulmonary hypertension research.
• To identify more sensitive and specific biomarkers for disease severity and prognosis.
• To advocate for exercise hemodynamics as a primary endpoint in clinical trials.

Main Methods:

• Discussion of existing endpoints including the 6-minute walk test and resting right heart pressures.
• Review of composite endpoints like 'time to clinical worsening'.
• Evaluation of emerging methods such as echocardiography, cardiopulmonary exercise testing, and cardiac MRI.

Main Results:

• Existing markers like resting pressures and walk tests have limitations in reflecting true disease progression.
• Composite endpoints and advanced imaging/testing modalities show mixed results.
• A definitive, sensitive, and specific biomarker for PH remains elusive.

Conclusions:

• There is a critical need for improved clinical endpoints in pulmonary hypertension.
• Exercise hemodynamics offer a promising avenue for a reproducible and accurate endpoint.
• Further research into exercise hemodynamics can enhance the evaluation of new PH therapies.