纤维化性间质性肺疾病低氧血症研究进展

Research Progress on Hypoxemia in Fibrotic Interstitial Lung Disease

摘要: 纤维化性间质性肺疾病(F-ILD)是一组以肺间质纤维化为主要特征的异质性疾病，常伴随气体交换受损和低氧血症。劳力性低氧血症是F-ILD早期的常见表现，可在肺功能相对保留时即出现，并随着病情进展演变为静息性低氧血症，而夜间低氧血症在临床实践中常被忽视，但与疾病进展和死亡风险密切相关。近年来的研究表明，低氧血症的发生机制涉及通气–灌注比例失调、弥散功能障碍、低氧性肺血管收缩等。弥散量下降是预测劳力性和静息性低氧血症的重要指标，夜间低氧血症则与肺动脉高压密切相关。不同类型低氧血症均提示不良预后，其识别对于疾病分期和预后评估具有重要意义。氧疗作为目前主要的干预措施，包括长期氧疗、动态氧疗和夜间氧疗，可改善症状和生活质量，但其对生存的获益仍缺乏确切证据。综上，F-ILD患者低氧血症的早期识别与干预应受到重视，未来需进一步通过大样本、前瞻性研究明确不同类型低氧血症的临床价值，并优化氧疗策略以改善患者结局。

Abstract: Fibrotic interstitial lung disease (F-ILD) is a heterogeneous group of disorders characterized by interstitial pulmonary fibrosis, often accompanied by impaired gas exchange and hypoxemia. Exertional hypoxemia is a common early manifestation of F-ILD and may occur even when lung function is relatively preserved, progressing to resting hypoxemia as the disease advances. Nocturnal hypoxemia, frequently overlooked in clinical practice, is closely associated with disease progression and increased mortality risk. Recent studies indicate that the mechanisms underlying hypoxemia involve ventilation-perfusion mismatch, diffusion impairment, and hypoxic pulmonary vasoconstriction. Reduced diffusing capacity is a significant predictor of exertional and resting hypoxemia, while nocturnal hypoxemia is strongly linked to pulmonary hypertension. All types of hypoxemia indicate poor prognosis, and their identification plays a crucial role in disease staging and outcome assessment. Oxygen therapy, including long-term oxygen therapy, ambulatory oxygen therapy, and nocturnal oxygen therapy, is the primary intervention to alleviate symptoms and improve quality of life, though its survival benefits remain inconclusive. In conclusion, early recognition and intervention of hypoxemia in F-ILD patients should be prioritized. Future large-scale, prospective studies are needed to clarify the clinical significance of different hypoxemia types and optimize oxygen therapy strategies to improve patient outcomes.