NPPB and chronic thromboembolic pulmonary hypertension: Although the results showing a significantly reduced exercise capacity would indicate severe disease progression at the time of enrollment, interestingly, comparing the results of the median (±IQR) RAP with the same registries, the Latvian CTEPH patients had a significantly lower median (±IQR) RAP 3.0 (±4.0 mmHg (mean (±SD) RAP: BNP-PL 7.7 (±4.6) mmHg; HOPE 8.0 (±5.0) mmHg; SPHAR: 7 (±7) mmHg) [14,15,16].