Pulmonary hypertension with a precapillary component in heart failure with preserved ejection fraction

Heart failure with preserved ejection fraction (HFpEF) is often complicated by pulmonary hypertension (PH), which is mainly characterised by postcapillary PH and occasionally accompanied by a precapillary component of PH. Haemodynamic changes in worsening heart failure (HF) can modify the characteristics of PH. However, the clinical features of PH after HF treatment in HFpEF remain unclear. We investigated the prevalence and clinical significance of the precapillary component of PH after HF treatment in HFpEF, using data from the Prospective Multicentre Observational Study of Patients with HFpEF (PURSUIT-HFpEF).From the PURSUIT-HFpEF registry, 219 patients hospitalised with acute HF who underwent right heart catheterisation after initial HF treatment were divided into four groups according to the 2015 and 2018 PH definitions: non-PH, isolated postcapillary pulmonary hypertension (Ipc-PH), precapillary PH and combined postcapillary and precapillary pulmonary hypertension (Cpc-PH). The latter two were combined as PH with the precapillary component.Using the 2015 definition, we found that the prevalence of PH after HF treatment was 27% (Ipc-PH: 20%, precapillary PH: 3%, Cpc-PH: 4%). Applying the 2018 definition resulted in a doubled frequency of precapillary PH (6%). PH with a precapillary component according to the 2015 definition was associated with poor clinical outcomes and characterised by small left ventricular dimension and high early diastolic mitral inflow velocity/early diastolic mitral annular tissue velocity.After initial HF treatment, 7% of hospitalised patients with HFpEF had precapillary component of PH according to the 2015 definition. Echocardiographic parameters of the left ventricle can contribute to the risk stratification of patients with HFpEF with a precapillary component of PH.