Pulmonary heart disease (referred to as pulmonary heart disease) is mainly a heart disease caused by pulmonary hypertension due to bronchopulmonary tissue or pulmonary artery vascular lesions. It can be divided into two categories, acute and chronic, according to the urgency of the onset and duration of the disease. The latter is more common in clinical practice. The disease develops slowly, and in addition to the various symptoms and signs of the original lung and chest diseases, the signs of pulmonary and cardiac failure and other organ damage mainly appear gradually. 1. X-ray examination In addition to the characteristics of lung and chest diseases and acute lung infection, there may also be signs of pulmonary hypertension, such as dilatation of the right lower pulmonary artery trunk, its transverse diameter ≥ 15mm; its transverse diameter to tracheal transverse diameter ratio ≥ 1.07; pulmonary artery segment protrudes significantly or its height ≥ 3mm; right ventricular enlargement signs, all of which are the main basis for the diagnosis of pulmonary heart disease. 2. Electrocardiographic examination mainly shows changes of right ventricular hypertrophy, such as rightward deviation of the electrical axis, frontal mean electrical axis ≥ +90°, severe cis-clockwise transposition, Rv1+Sv5≥1.05mV and pulmonary P wave. Right bundle branch conduction block and low voltage patterns were also seen, which can be used as reference conditions for the diagnosis of pulmonary heart disease. In V1, V2, and even extending to V3, QS waves resembling paroxysmal myocardial infarction patterns may be seen. 3. Echocardiographic examination The right ventricular outflow tract inner diameter (≥30mm), right ventricular inner diameter (≥20mm), thickness of right ventricular anterior wall, ratio of left and right ventricular inner diameter (<2), right pulmonary artery inner diameter or enlarged pulmonary trunk and right atrium are measured to diagnose pulmonary heart disease. 4. Blood gas analysis Hypoxemia or combined hypercapnia can occur in the lung function failure stage of pulmonary heart disease, when PaO2<8.0kpa (60mmhg), paco2>6.6kPa (50mmHg), indicating the presence of whistling failure. 5. Blood tests Red blood cells and hemoglobin may be elevated. Complete blood viscosity and plasma viscosity may be increased, and when combined with infection, the total white blood cell count increases and neutrophils increase. Some patients may have changes in renal or liver function in serological examination; serum potassium, sodium, chloride, calcium and magnesium may be changed. Except for potassium, most of them are lower than normal. 6. Other pulmonary function tests are meaningful for patients with early or remitting pulmonary heart disease. Sputum bacteriological examination can guide the selection of antibiotics for acute exacerbation of pulmonary heart disease.