Ty -jour t1-共同-19患者的高流量鼻套管：生物 - 大卫星分散的风险JF-欧洲呼吸杂志Li，Jie au -Fink，James B. au -Ehrmann，Stephan Y1-2020/10/01 Ur -http：//www.qdcxjkg.com/content.com/content/56/4/4/2003136.AbstractJ. Elshof和同事在我们的文章中“ Covid-19患者的高流量鼻套管：生物 - 大氧溶胶分散剂的低风险” [1]并同意，有必要进一步研究以降低感染患者的病毒传播风险。使用烟雾分散距离和速度的光检测出来的J. Elshof和同事的体外数据，这表明高流量鼻套管（HFNC）产生的分散距离比非尿布剂面膜和文uri面具（Venturi Masks）更大与Hui等人的报道相反。[2]使用类似的模型。据推测，因为J. Elshof和同事使用的烟雾比Hui等人使用的烟雾大（0.3-2.5 µm）。[2]（≤1µm），较大的颗粒分散不同。应当指出的是，两种模型中的烟雾仅代表患者在呼吸，口语，咳嗽或打喷嚏期间患者产生的生物卫生剂范围的一小部分[3]。使用相同尺寸的气道模型，J。Elshof和同事观察到，当将HFNC流量设置为30 L·min-1时，通过将鼻套管大小从小变为大，色散距离从71 cm降低到25 cm。 however, when HFNC flow was set at 60 L·min−1, the medium-size nasal cannula generated a shorter distance than both small and large nasal cannulas. This raises the role of proper fit of prongs to nares and highlights the limitations of modelling. Regardless of the sizes of nasal cannula, the dispersion distance was farther with 60 L·min−1 than 30 L·min−1, which is in line with the results of Hui et al. [2] and may be expected, as higher velocity of the gas will carry exhaled smoke to a further distance. However, this effect of total flow did not occur when testing the Venturi mask. Surprisingly, the Venturi mask with large open holes and a total gas flow of 40 L·min−1 generated a shorter dispersion distance than normal breathing. These inconsistencies are difficult to interpret without comprehensive peer review of extensive methods and results. Whether smoke imaging models truly reflect the natural features of the transportation and dispersion of bio-aerosols generated by patients has not been established and results from these studies should be interpreted cautiously.High-flow nasal cannula does not generate higher risk of bio-aerosol dispersion than conventional oxygen masks https://bit.ly/2Yn0RQn ER -