When measuring pulmonary hypertension with tricuspid regurgitation, the differential pressure value for tricuspid regurgitation is usually obtained by cardiac ultrasound. If it is a large amount of tricuspid regurgitation, then use the regurgitation pressure difference value plus 15 is pulmonary arterial hypertension; if it is a medium amount of tricuspid regurgitation, then use the regurgitation pressure difference value plus 10; if it is a small amount of tricuspid regurgitation, then use the pressure difference value plus 5. The systolic pulmonary artery pressure in a normal person is 15-30 mmHg, with an average of 15 mmHg. Pulmonary hypertension is diagnosed if the average pulmonary artery pressure is greater than 25 mmHg at rest and greater than 30 mmHg during exercise. Pulmonary hypertension is further categorized into 3 grades based on the level of pulmonary hypertension. Mild refers to a pulmonary artery systolic pressure of 30-40 mmHg, moderate refers to a pulmonary artery systolic pressure of 40-70 mmHg, and severe refers to a pulmonary artery systolic pressure greater than 70 mmHg.