Exercise-Induced Pulmonary Hypertension: Translating Pathophysiological Concepts Into Clinical Practice

Area of Science:

• Cardiology
• Pulmonology
• Exercise Physiology

Background:

• Exercise stress testing is increasingly used to detect latent or early pulmonary hypertension (PH).
• Emerging consensus defines exercise-induced PH using specific hemodynamic criteria during maximal exercise.
• Exercise-induced PH is linked to various conditions and impacts exercise capacity and life expectancy.

Purpose of the Study:

• To define diagnostic criteria for exercise-induced pulmonary hypertension (PH).
• To explore the causes and clinical implications of exercise-induced PH.
• To emphasize the importance of dynamic, invasive measurements for accurate diagnosis.

Main Methods:

• Utilizing dynamic exercise stress testing with invasive hemodynamic measurements.
• Measuring mean pulmonary artery pressure, cardiac output, and total pulmonary vascular resistance during maximal exercise.
• Assessing pulmonary artery wedge pressure and its relationship with cardiac output to differentiate causes.

Main Results:

• Exercise-induced PH defined by specific pressure, output, and resistance thresholds during exercise.
• Association of exercise-induced PH with genetic mutations, systemic sclerosis, left heart disease, lung diseases, and thromboembolism.
• Identification of pulmonary vasoconstriction, vascular remodeling, or elevated pulmonary venous pressure as underlying causes.

Conclusions:

• Exercise stress testing is vital for diagnosing exercise-induced PH.
• Accurate diagnosis requires invasive hemodynamic monitoring during dynamic exercise.
• Understanding the causes of exercise-induced PH is crucial for patient management and prognosis.