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目的 观察不同给氧方式和暖箱密闭状态对早产儿暖箱内氧浓度、温度和相对湿度的影响。方法 选择4台不同型号的早产儿暖箱,测定不同氧流量下,暖箱进风口给氧及暖箱内头罩给氧时,模型患儿鼻部的氧浓度、温度和湿度的变化。结果 氧流量在2L/min及10L/min时,采用暖箱进风口给氧可使模型患儿鼻部的氧浓度分别达到(24.36±1.75)%和(39.52±11.95)%,而采用暖箱内头罩给氧则可使模型患儿鼻部的氧浓度高达(38.91±1.37)%和(61.76±7.62)%(P<0.01);开放头部仓门暖箱内氧浓度下降1.08%~4.06%,变化不大(P>0.05);环境温度在 25.5℃~26.5℃时,给氧方式、氧流量和暖箱密闭状态对暖箱内温度无明显影响;暖箱内相对湿度受环境相对湿度、氧流量和暖箱密闭状态的影响。结论 暖箱内头罩给较大流量的纯氧将导致氧浓度过高,不宜常规使用;适当提高环境相对湿度和氧气充分湿化对维持暖箱内相对湿度有益。
Objective To observe the effects of different oxygenation modes and warmbox confinement on oxygen concentration, temperature and relative humidity in premature infants’ warm box. Methods Four different models of premature infants were selected to measure the change of oxygen concentration, temperature and humidity in the nose of the model children under different oxygen flow rate, oxygen supply in warm box and oxygen supply in warm box. Results The results showed that the oxygen concentration in the nasal area of the model children reached (24.36 ± 1.75)% and (39.52 ± 11.95)% respectively at the oxygen flow rate of 2L / min and 10L / min, Oxygen inside the hood could make the nasal oxygen concentration in the model children reach as high as (38.91 ± 1.37)% and (61.76 ± 7.62)% (P <0.01), oxygen concentration in open head warehouse decreased by 1.08% 4.06%, little change (P> 0.05). When the ambient temperature is between 25.5 ℃ and 26.5 ℃, there is no obvious influence on the temperature inside the incubator due to the oxygen mode, the oxygen flow rate and the hermetically sealed condition. Humidity, Oxygen Flow, and Hermetic Containment. Conclusions The pure oxygen in the hotbox with larger flow rate will cause the oxygen concentration to be too high, which should not be used routinely. Appropriately increasing the relative humidity of the environment and the full humidification of the oxygen are beneficial to maintaining the relative humidity in the warm box.