Continuous heart monitoring to evaluate treatment effects in pulmonary hypertension

Abstract Background The treatment of pulmonary hypertension (PH) has improved rapidly in recent years, and there is increasing evidence to support the role of early intervention. However, studies demonstrate that timely intervention is often still lagging which affects clinical outcomes in patients with PH. Purpose To assess treatment effects after escalation of specific PH treatments using continuous heart monitoring via a Reveal LINQ loop recorder. Methods The patients change in heart rate variability (HRV), heart rate (HR), and physical activity were assessed before and after treatment escalation. Treatment escalation was defined as an additional PAH drug, pulmonary endarterectomy (PEA), percutaneous balloon angioplasty (PBA), or bilateral lung transplantation (BLTX). Results In this prospective study, 41 patients (27 with PAH and 14 with chronic thromboembolic pulmonary hypertension) were enrolled. Among them, 15 patients (36.6%) underwent PH treatment escalation. Prior to escalation, patients were monitored for a median of 100 (range: 68–100) days and after therapy escalation for a median duration of 165 (range: 89–308) days. In the escalation group, a significant increase in HRV (Figure), physical activity indexed by daytime HR was observed, while a significant decrease was seen in nighttime HR assessed at baseline and after treatment escalation. These changes were found both in the PAH and CTEPH group. In parallel a significant improvement in WHO functional class, 6-minute walking distance, and N-terminal pro-b-type natriuretic peptide (NT-proBNP) was observed. Conclusions This is the first study to demonstrate a direct association between specific PH therapies and changes in HRV, HR nighttime and physical activity in patients with PAH and CTEPH. Continuous monitoring allows for an early intervention with supplementary treatment for PH. This is especially relevant considering the increasing availability of wearables that allow for a convenient measurement of relevant prognostic parameters in PH.