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１５２例ＡＳＡⅠ级行择期整形手术的小儿，根据年龄分成三组：Ⅰ组为３个月～１岁的婴儿（ｎ＝３９）；Ⅱ组为１～３岁的幼儿（ｎ＝４１）；Ⅲ组为３～１２岁的小儿（ｎ＝７２）。每组小儿再随机分成Ａ亚组和Ｂ亚组。监测ＳｐＯ２、血压、心率和ＰＥＴＣＯ２。预氧时间为２ｍｉｎ。在麻醉诱导后的无通气期，Ａ亚组和Ｂ亚组分别在ＳｐＯ２降至９０％和９５％时给氧。结果证实，小儿ＳｐＯ２降至９５％和９０％所需的无通气时间在三组间均具有明显差别。给氧后，Ａ亚组全部小儿的ＳｐＯ２降至９０％以下；而Ｂ亚组仅有２例（２．７％）小儿的ＳｐＯ２降至９０％以下。给氧后ＳｐＯ２降至的最低值在三组间及每组的Ａ亚组和Ｂ亚组间均有明显差别。因此小儿无通气间期ＳｐＯ２的安全阈值应建立在９５％。直线回归分析发现，无通气期ＳｐＯ２降至９５％所需时间与小儿年龄、体重和身高具有明显相关性。１５２例ＡＳＡⅠ级行择期整形手术的小儿，根据年龄分成三组：Ⅰ组为３个月～１岁的婴儿（ｎ＝３９）；Ⅱ组为１～３岁的幼儿（ｎ＝４１）；Ⅲ组为３～１２岁的小儿（ｎ＝７２）。每组小儿再随机分成Ａ亚组和Ｂ亚组。监测ＳｐＯ２、血压、心率和ＰＥＴＣＯ２。预氧时间为２ｍｉｎ。在麻醉诱导后的无通气期，?
Fifty-two children undergoing ASA stage I elective plastic surgery undergoing elective plastic surgery were divided into three groups according to age: group I was infants from 3 months to 1 year old (n = 39); group II infants (n = 41) Group 3 to 12-year-old children (n = 72). Each group of children were randomly divided into A subgroup and B subgroup. SpO2, blood pressure, heart rate and PETCO2 were monitored. Pre-oxygen time is 2min. In the non-ventilated phase after induction of anesthesia, subgroups A and B were given oxygen when SpO2 decreased to 90% and 95%, respectively. The results confirmed that the time required for ventilatory reduction in children with SpO2 to 95% and 90% was significantly different among the three groups. After oxygen administration, SpO2 in all children in the subgroup A dropped below 90%, whereas in the subgroup B only 2 (2.7%) children had SpO2 levels below 90%. The lowest value of SpO2 after oxygen administration was significantly different between the three groups and between the A subgroup and the B subgroup of each group. Therefore, children without ventilatory interval SpO2 safety threshold should be established at 95%. Linear regression analysis found that the time required for SpO2 to decrease to 95% during non-ventilated periods was significantly associated with pediatric age, weight, and height. Fifty-two children undergoing ASA stage I elective plastic surgery undergoing elective plastic surgery were divided into three groups according to age: group I was infants from 3 months to 1 year old (n = 39); group II infants (n = 41) Group 3 to 12-year-old children (n = 72). Each group of children were randomly divided into A subgroup and B subgroup. SpO2, blood pressure, heart rate and PETCO2 were monitored. Pre-oxygen time is 2min. After induction of anesthesia without ventilation,?