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肺动脉高压通常继发于心脏或肺疾病,“原发性”或原因不明的肺动脉高压极为少见。在心输出量为5～6的海平面上,肺动脉收缩压约20mmHg,舒张压约12mmHg。肺动脉高压时,平均动脉压在19～20mmHg以上。原发性肺动脉高压虽然少见,但却很重要,因患者多为年轻人,其中仅25％的病人生存期为10年。诊断经常被延误,因为无心脏、呼吸功能不全或胶原血管病,所以,肺血管阻力升高的体征可能被漏诊。有气喘的病人,特别是伴有晕厥和心绞痛时,应考虑到此诊断。后期出现右心衰竭,但常能听到响亮的肺动脉瓣第二心音。95％
Pulmonary hypertension is usually secondary to heart or lung disease, and “primary” or unexplained pulmonary hypertension is extremely rare. In the cardiac output of 5 to 6 sea level, pulmonary artery systolic pressure of about 20mmHg, diastolic blood pressure of about 12mmHg. Pulmonary hypertension, the mean arterial pressure at 19 ~ 20mmHg above. Although rare, primary pulmonary hypertension is important because most patients are young, of whom only 25% have a 10-year survival. Diagnosis is often delayed because there is no heart, respiratory insufficiency or collagen vascular disease, so the signs of pulmonary vascular resistance may be missed. Patients with asthma, especially with syncope and angina, should consider this diagnosis. The latter appears right heart failure, but can often hear the sound of the second pulmonary heart valve sound. 95%