在严重的SARS-CoV-2肺炎后长期的膜-毛囊扩散障碍
Laura Pini1,2, Jordan Giordani1, Guido Levi1,3
1Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy.
Annals of medicine
|March 28, 2025
概括
持续的COVID-19肺部问题很常见. 这项研究发现,血管问题,而不是膜损伤,导致长期损害肺部对一氧化碳 (DLCO) 的扩散能力.
科学领域:
- 肺部病理学 肺部病理学
- 呼吸系统医学 呼吸系统医学
- 关键护理医学 关键护理医学
背景情况:
- 持续的呼吸道症状和气体交换受损是从COVID-19肺炎中康复的患者常见的后果.
- 像DLCO和KCO这样的标准肺功能测试无法可靠地区分膜功能障碍和血管异常.
- 在先前患有SARS-CoV-2肺炎和降低DLCO的ICU后患者中表征持续扩散损伤对于了解长期呼吸系统后果至关重要.
研究的目的:
- 在COVID-19肺炎后的重症监护室 (ICU) 患者中表征持续的扩散障碍.
- 要区分气泡毛细管膜 (DmCO) 和肺毛细管血液体积 (Vc) 的变化,有助于减少DLCO.
- 通过结合DLNO和DLCO评估,研究持续扩散损害的潜在机制.
主要方法:
- 之前患有SARS-CoV-2肺炎和减少DLCO的患者在出院后接受了连续螺旋测量和6分钟步行测试.
- 如果DLCO仍然受损,在18-24个月后进行了对氧化 (DLNO) 和DLCO的肺扩散能力的综合评估.
- 这项评估旨在区分膜毛细管膜 (DmCO) 和肺毛细管血液体积 (Vc) 的变化.
主要成果:
- 在20名患有持续DLCO减少的患者中,3名患有阻塞性,6名患有限制性呼吸模式,12名患有低KCO.
- 在所有患者中,DLNO/DLCO比率超过预测的113.5%,表明扩散障碍的特定模式.
- 肺毛细血管血液体积 (Vc) 在16名患者中减少,而膜毛细血管膜 (DmCO) 在7名患者中受损.
结论:
- 在COVID-19后的患者中,持续的DLCO减少主要是由肺血管功能障碍 (Vc减少) 驱动的.
- 气泡膜 (DmCO) 变化不那么突出,Vc减少是导致长期扩散障碍的主要原因.
- 较高的DLNO/DLCO比率突出显示了COVID-19后持续性呼吸系统尾症中重要的血管成分.
相关概念视频
COPD: Pathogenesis and Clinical Features
2.1K
Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
2.1K
Acute Respiratory Failure-II
1.8K
Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
1.8K
Acute Respiratory Failure-III
1.3K
Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without...
1.3K
Chronic Obstructive Pulmonary Disease-II: Pathophysiology
5.0K
Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Chronic Inflammation
5.0K
Atelectasis II: Pathophysiology
75
Atelectasis develops when alveoli lose their air and collapse inward. Because lung tissue is naturally elastic, these air sacs shrink rather than remaining open. Collapsed alveoli are no longer ventilated, reducing their role in gas exchange. Blood flow may continue in these regions, creating a ventilation–perfusion mismatch. Clinical findings include decreased breath sounds, dullness to percussion, reduced chest expansion, and decreased tactile fremitus as sound transmission through...
75
Chronic Obstructive Pulmonary Disease II: Emphysema
155
Emphysema, a major phenotype of chronic obstructive pulmonary disease (COPD), is characterized by irreversible destruction of alveolar walls and permanent enlargement of distal airspaces. Unlike chronic bronchitis, which primarily affects the airways, emphysema predominantly involves the lung parenchyma, where structural damage leads to airflow limitation.PathophysiologyIt most commonly results from prolonged exposure to cigarette smoke and other toxic gases, particularly cigarette smoke.
155


