Fig. 4

Kaplan–Meier survival curve analysis in 127 PH patients for RVFWLS over a follow-up period of 29 [19–40] months. RVFWLS was categorised into low risk (blue line, n = 73) and high risk (red line, n = 54). ROC derived cut-off RVFWLS value was used to categorise those at low (> − 15%) or high (≤ − 15.5%) risk of all-cause mortality. Kaplan–Meier survival curve analysis demonstrated a significant difference in survival between those with low risk RVFWLS scores and high risk RVFWLS scores (P < 0.01)