[Characteristics of patients with chronic thromboembolic pulmonary hypertension according to the Russian National Registry].

Aim: To assess demographic and clinical characteristics, to describe of the functional and hemodynamic status, profile of concomitant pathology, data of instrumental examination in chronic thromboembolic pulmonary hypertension (CTEPH) patients; to study the features of specific and supportive therapy according to the data of the Russian national registry.
Materials and Methods: From 2012 till 2020 a multicenter, prospective study in 15 regional expert centers of the Russian Federation (www.medibase.pro) included 404 newly diagnosed CTEPH patients over the age of 18 years in the Russian registry of patients with pulmonary arterial hypertension and CTEPH (NCT03707561). The diagnosis was established by European and Russian clinical guidelines for the diagnosis and management of pulmonary hypertension. 154 inoperable CTEPH patients an additional analysis of specific and supportive therapy was performed.
Results: The study included 404 patients (55.6% women and 44.3% men) at the age of 58.6 [48.6; 69.3] years. Median time from symptom onset to the diagnosis verification waswas 2.4 years (from 0.1 to 2.9 years). 79.1% of patients were in the III and IV functional class (World Health Organization) at the time of diagnosis and in 44.1% with RHF (right heart failure). In assessing the profile of concomitant pathology, it was noted that CTEPH patients were more often with arterial hypertension (39.1%), erosive-ulcerative lesions of the stomach/duodenum (16.1%), atrial fibrillation (13.8%), obesity (13.1%). Distance in 6MWD (6-min walk distance) was 337.2 [250; 422] m, Borg dyspnea index scale 4.1 [3.0; 5.0] points. Hemodynamic parameters according to right heart catheterization were: Mean PAP (pulmonary arterial pressure) (51.114.04) mmHg, CO (cardiac output) (3.50.98) l/min, CI (cardiac index) (2.00.48) l/min/m2, PVR (2008528) dyns/cm5.
Conclusion: According to the Russian registry, inoperable CTEPH patients had precapillary PH (pulmonary hypertension) with severe functional status, in combination with frequent concomitant pathology (arterial hypertension, erosive-ulcerative lesions of the stomach/duodenum, atrial fibrillation, obesity, right heart failure). 66% of inoperable CTEPH patients received specific drug therapy.