In the CTEPH group, Log NT-proBNP, NTAR, RGR, NLR, and eGFR emerged as significant predictors of ELOS, with Log NT-proBNP and NTAR again demonstrating the strongest discriminative performance (AUCs: 0.748 and 0.743, respectively). Here, NPPB is linked to chronic thromboembolic pulmonary hypertension.