The Prognostic Role and Diagnostic Efficacy of Exercise Right Heart Catheterization With a Simultaneous Echocardiography in Patients With Dyspnea on Exertion

This study is evaluating a special heart test — right heart catheterization done during exercise combined with an echocardiogram (heart ultrasound) — to better diagnose and predict outcomes in patients who get short of breath during physical activity. Researchers want to understand whether this combined test is better at identifying the cause of exercise-related breathlessness. **You may be eligible if...** - You are at least 19 years old - You experience shortness of breath during exercise - You have given written informed consent (for prospective part of the study) **You may NOT be eligible if...** - You have incomplete heart pressure data available - You have advanced cancer or another condition with a short life expectancy - Your blood pressure is uncontrolled (above 160/100 mmHg at rest) - Your lung function is significantly reduced (FEV1 below 50% or total lung capacity below 60% of expected) Talk to your doctor to see if this trial is right for you.