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目的了解在不同头罩下和不同供气的流量下,新生儿的鼻腔内外的CO2的浓度变化。方法通过用空气-氧气混合器、测氧仪、CO2浓度测定仪等仪器,测定在不同头罩下和不同供气的流量下,新生儿的鼻腔内外的CO2的浓度。结果经统计学分析显示,新生儿在大、中、小头罩下,各组在外无来供气的情况下,头罩内二氧化碳的浓度随着时间延长而逐渐增高;各组在供气流量的变化与新生儿鼻腔内外二氧化碳浓度的变化呈直线负相关关系。当流量大于3L/min时,各组CO2的浓度分别与不用头罩时新生儿鼻腔内外二氧化碳浓度比较,差异具有显著性意义(p<0.01)。结论新生儿鼻腔内外二氧化碳浓度的变化与头罩供气流量呈直线负相关关系;当头罩供氧气混合气流量大于或等于3L/min时,不会引起头罩内二氧化碳的潴留。
Objectives To understand the change in concentration of CO2 inside and outside the nasal cavity of neonates under different hoods and different gas flow rates. Methods The concentrations of CO2 in neonates’ nasal and nasal passages under different hoods and different gas flows were measured by air-oxygen mixer, oxygen meter and CO2 concentration meter. Results The statistical analysis showed that under the condition of large, medium and small headgear, the concentration of carbon dioxide in the headgear gradually increased with the increase of time under the circumstance of no gas supplied to each group. In each group, There was a linear negative correlation between the change of carbon dioxide concentration in the nasal cavity and the newborn. When the flow rate was more than 3L / min, the CO2 concentration in each group was significantly higher than that in the nasal cavity without nasal mask (p <0.01). Conclusion The changes of nasal CO2 concentration in the nasal cavity and the nasal air supply have a linear negative correlation. When the oxygen flow rate of the hood is greater than or equal to 3L / min, it will not cause carbon dioxide retention in the hood.