Why does right heart failure cause pericardial effusion?

Heart failure can lead to pericardial effusion, which occurs due to impaired cardiac function causing elevated pulmonary venous pressure and a consequent increase in capillary permeability. Increased pulmonary capillary pressure contributes to fluid accumulation. Therefore, in treatment, it is essential to actively correct the patient's heart failure. In some cases, pericardiocentesis may be necessary to aspirate the pericardial fluid for relevant examinations, based on which appropriate drug therapy can be selected. In clinical practice, the most common causes of pericardial effusion are tuberculous pericarditis and malignant diseases.