Prognostic Importance of Pulmonary Artery Pulsatility Index and Right Ventricular Stroke Work Index in End-Stage Heart Failure Patients

Background: Right ventricular (RV) failure is an important cause of morbidity and mortality in patients with left ventricular (LV) end-stage heart failure (ESHF). Pulmonary artery pulsatility index (PAPi) and right ventricular stroke work index (RVSWI) are invasive parameters related to RV function. This study aimed to investigate the prognostic impact of PAPi and RVSWI in these patients. Methods and Results: In this study, 416 patients with ESHF were included. The adverse cardiac event (ACE) was defined as left ventricular assist device (LVAD) implantation, urgent heart transplantation, or cardiac mortality. There were 218 ACE cases and 198 non-ACE cases over a median follow-up of 503.50 days. Patients with ACE had lower PAPi and similar RVSWI compared to those without ACE (3.1±1.9 vs. 3.7±2.3, P=0.003 and 7.3±4.9 vs. 6.9±4.4, P=0.422, respectively). According to the results of multivariate analysis, while PAPi (from 2 to 5.65) was associated with ACE, RVSWI (from 3.62 to 9.75) was not associated with ACE (HR: 0.75, 95% CI (0.55-0.95), P=0.031; HR: 0.79, 95% CI: (0.58-1.09), P=0.081, , respectively). Survival analysis revealed that PAPi ≤2.56 was associated with a higher ACE risk compared to PAPi >2.56 (HR: 1.46, 95% CI: 1.11-1.92, P=0.006). PAPi ≤2.56 could predict ACE with 56.7% sensitivity and 51.3% specificity at one year. Furthermore, the association between RVSWI and ACE was nonlinear (J-curve pattern). Low and high values seem to be associated with higher ACE risk compared to intermediate values. Conclusion: The low PAPi was an independent risk for ACE and it had a linear association with it. However, RVSWI seems to be have a nonlinear association with ACE (J-curve pattern).