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本例是一位出现呼吸性酸中毒与肺心病的病人，主要诊断困难是原发性心肺疾病与通气驱动的中枢异常的鉴别论断。动脉血气显示A－a梯度正常而肺通气不足作为他低氧血症的原因。肺功能试验显示空气陷波（airtrapping），但FEV1／FVC比正常与气道阻力。文献认为多数高原当地人低氧
This is a case of respiratory acidosis and pulmonary heart disease patients, the main diagnostic difficulty is primary cardiopulmonary disease and ventilation-driven central anomaly of the differential diagnosis. Arterial blood gas showed normal A-a gradient and hypoventilation as the cause of his hypoxemia. Pulmonary function tests showed air airtrapping, but FEV1 / FVC was more than normal and airway resistance. Literature that most locals hypoxia