Chronic Thromboembolic Disease Registry

This is an observational registry (data collection study, not a treatment trial) for people with chronic thromboembolic disease — a condition where old blood clots in the lungs do not fully dissolve and cause lasting blockage and breathing problems, sometimes leading to high blood pressure in the lung arteries (pulmonary hypertension). **You may be eligible if...** - You have been referred to a specialist with suspected or confirmed chronic thromboembolic pulmonary disease or pulmonary hypertension from old clots - Diagnosis is supported by imaging evidence of chronic clots in the lung arteries - You have exercise limitations or abnormal pressures in the lung arteries **You may NOT be eligible if...** - You do not have evidence of chronic thromboembolic disease on imaging or pressure measurements - You are unable or unwilling to participate in data collection Talk to your doctor to see if this trial is right for you.