The authors performed a non-interventional registry study of the diagnosis and treatment of 212 patients with chronic thromboembolic pulmonary hypertension (CTEPH) in Russia, Kazakhstan, Turkey, Lebanon, and Saudi Arabia over 3 years.

Almost 90% of patients underwent right heart catheterization at diagnosis or initial study visit, while other diagnostic techniques were performed less frequently, possibly reflecting limited resources.

These results show that early CTEPH diagnosis remains challenging in countries with limited resources.