For long-term obstructive pulmonary hypertension. Even if the surgery itself relieves the obstruction, the increased pulmonary artery pressure does not decrease immediately. The surgery itself can also lead to increased pulmonary artery pressure. The peak postoperative period is between 24 and 36 hours. Since it cannot be reduced in a short period of time, it is sufficient to maintain the pressure in the body circulation after surgery, even if the pulmonary artery pressure is increased. In very high pulmonary hypertension, where extubation is difficult, glucocorticoids can be applied in moderation before extubation. 1.Increase colloid, restrict fluid intake to reduce interstitial edema and increase the outflow. 2.Adequate sedation and analgesia. Add the muscle relaxant Ativan. 3.Prevent and control pulmonary infection, adequate drainage. 4.Apply pulmonary protective agents (sputumification, antispasmodic). 5.Apply ventilator with low CO2/high PO2. 6.Preferably apply body therapy with body therapist. 7.Apply antihypertensive drugs (angiotensin-converting enzyme inhibitors, sodium nitroprusside, etc.) to the lowest body arterial pressure that can be maintained. 8, cardiac strengthening: milrinone, dobutamine mainly; caution with dopamine, epinephrine, norepinephrine is prohibited.