一、呼吸钟摆的理论
表1 两种呼吸钟摆理论的对比 |
| 对比内容 | Otis,1956 | Yoshida,2013 |
|---|---|---|
| 理论提出方式 | 数学推演 | 实验印证假设 |
| 钟摆形成条件 | 肺泡时间常数不均 | 背侧肺不张/实变 + 自主呼吸 |
| 自主呼吸 | 不必要 | 必要 |
| 钟摆发生时相 | 吸气末和呼气末期 | 吸气相 |
| 钟摆气体流向 | 吸气末期:时间常数短的肺泡流向时间常数长的肺泡 呼气末期:与吸气相相反 | 吸气相早期:非重力依赖区流向重力依赖区 吸气相后期:与早期相反 |
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Chinese Journal of Critical Care & Intensive Care Medicine(Electronic Edition) >
2022 , Vol. 08 >Issue 01: 62 - 66
DOI: https://doi.org/10.3877/cma.j.issn.2096-1537.2022.01.009
Respiratory pendelluft in critically ill patients
Received date: 2021-08-31
Online published: 2022-04-18
Copyright
Respiratory pendelluft, defined as intrapulmonary gas redistribution caused by asynchronous alveolar ventilation, is often seen among critically ill patients with lung injury. The application of electrical impedance tomography (EIT) enables the bedside, non-invasive and quantitative measurement of the respiratory pendelluft. Attention has been paid to pendelluft phenomenon in recent years for its potential to aggravate lung injury through inducing alveolar overdistension, tidal recruitment and decline of ventilation efficiency. To avoid excessive inspiratory effort and improve alveolar heterogeneity is the key to controlling pendelluft. This review mainly describes the theoretical basis, clinical relevance and intervention of respiratory pendelluft, with the hope of promoting the further understanding and study of this phenomenon.
Yi Chi , Huaiwu He , Yun Long . Respiratory pendelluft in critically ill patients[J]. Chinese Journal of Critical Care & Intensive Care Medicine(Electronic Edition), 2022 , 08(01) : 62 -66 . DOI: 10.3877/cma.j.issn.2096-1537.2022.01.009
表1 两种呼吸钟摆理论的对比 |
| 对比内容 | Otis,1956 | Yoshida,2013 |
|---|---|---|
| 理论提出方式 | 数学推演 | 实验印证假设 |
| 钟摆形成条件 | 肺泡时间常数不均 | 背侧肺不张/实变 + 自主呼吸 |
| 自主呼吸 | 不必要 | 必要 |
| 钟摆发生时相 | 吸气末和呼气末期 | 吸气相 |
| 钟摆气体流向 | 吸气末期:时间常数短的肺泡流向时间常数长的肺泡 呼气末期:与吸气相相反 | 吸气相早期:非重力依赖区流向重力依赖区 吸气相后期:与早期相反 |
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