Incorporation of noninvasive assessments in risk prediction for pulmonary arterial hypertension

Risk assessment for pulmonary arterial hypertension (PAH) utilizing noninvasive prognostic variables could be more practical in real-world scenarios, especially at follow-up re-evaluations. Patients who underwent comprehensive evaluations both at baseline and at follow-up visits were enrolled. The primary endpoint was all-cause mortality. Predictive variables identified by Cox analyses were further incorporated with the French noninvasive risk prediction approach. A total of 580 PAH patients were enrolled. During a median follow-up time of 47.0 months, 112 patients (19.3%) died. By multivariate Cox analyses, tricuspid annular plane systolic excursion (TAPSE), TAPSE/pulmonary arterial systolic pressure (PASP), and CPET-derived peak oxygen consumption (VO2) remained independent predictors for survival. Regarding the French noninvasive risk prediction method, substituting N-terminal pro b-type natriuretic peptide (NT-proBNP) with the newly derived low-risk criteria of a TAPSE ≥ 17 mm or a TAPSE/PASP > 0.17 mm/mmHg, or alternating six-minute walking distance with a peak VO2≥ 44 %predicted retained the discrimination power. When recombining the low-risk criteria, the combination of World Health Organization functional class (WHO FC), TAPSE and peak VO2 at baseline, and the combination of WHO FC, NT-proBNP and peak VO2 at follow-up showed better discriminative ability than the other combinations. In conclusion, Peak VO2, TAPSE and TAPSE/PASP are significant prognostic predictors for survival in PAH, with incremental prognostic value when incorporated with the French noninvasive risk prediction approach, especially at re-evaluations. For better risk prediction, WHO FC, at least one measurement of exercise capacity and one measurement of right ventricular function should be considered. This article is protected by copyright. All rights reserved.