Schematic representations of pulmonary hypertension. Schematic representations of pulmonary hypertension. (A) Schematic cross-sectional representation of a normal pulmonary arteriole and a pulmonary arteriole affected by pulmonary hypertension. (Adapted from Pugliese et al.7) (B) Schematic representation of site of initiation of elevated pulmonary arterial pressure of precapillary pulmonary hypertension, postcapillary pulmonary hypertension, and CTEPH. L.V., left ventricle; PH, pulmonary hypertension; R.A., right atrium; R.V., right ventricle. Victor R. Gordeuk et al. Blood 2016;127:820-828 ©2016 by American Society of Hematology