NPPB and pulmonary arterial hypertension: POCUS = point of care ultrasound; PH = pulmonary hypertension; PAH = pulmonary arterial hypertension; RHC = right heart catheterization; BNP = b-type natriuretic peptide; NT = N-terminal; PLAX = parasternal long axis; PSAX = parasternal short axis; A_C = apical _-chamber; SC4C = subcostal 4-chamber; PASP = pulmonary artery systolic pressure; RAP = right atrial pressure; VExUS = Venous Excess Ultrasound; EVEREST = Efficacy of Vasopressin Antagonism in Heart Failure: Outcome Study with Tolvaptan