Arterial Wave Energy Flux and Multidimensional Recovery in Patients With Chronic Thromboembolic Pulmonary Hypertension Undergoing Balloon Pulmonary Angioplasty

Inclusion Criteria: * Age 18-85 years. Confirmed diagnosis of CTEPH by a multidisciplinary CTEPH team and deemed eligible for BPA. Hemodynamics compatible with pre-capillary PH according to current guidelines, as assessed by RHC (Right Heart Catheterization). Technically inoperable CTEPH or persistent/recurrent PH following PEA (Pulmonary Endarterectomy). Written informed consent. Exclusion Criteria: * Predominant diagnosis of PH other than CTEPH or concomitant severe parenchymal lung disease. Active infection, uncontrolled systemic disease, active malignancy, or life expectancy \< 12 months. Pregnant or lactating patients. Advanced renal failure (e.g., eGFR \< 30 \\text{ mL/min/1.73 m\^2}) or contraindications to contrast media (per institutional routine). Inadequate image quality precluding reliable echocardiographic analysis. Pressure tracings with significant artifacts hindering analysis or uncontrolled arrhythmia (e.g., atrial fibrillation with rapid ventricular response). Decompensated or hemodynamically unstable patients. Any other condition deemed clinically unsuitable by the investigator.