Abstract:In September 2024, the European Respiratory Journal published a series of papers reported on the 7th World Symposium on Pulmonary Hypertension (WSPH), which was held in Barcelona, Spain at the end of June 2024. The papers provide a summary of recent research progress on pulmonary hypertension based on the diagnosis and treatment guidelines for pulmonary hypertension (PH) released in August 2022. Focusing on the most common type of pulmonary hypertension (PH), namely the pulmonary hypertension associated with left heart disease (PH-LHD), the article reviews the lastest progress on the related left heart disease, the pathophysiology, subclassification and the optimised treatment results of PH-LHD.