小儿不是缩小的成人。与成人相比,小儿的氧储备少,而代谢率高。同时,小儿由于舌体大,头大,颈短,声门位置高,导致小儿气管插管时声门暴露困难,有时需要较长时间进行操作,因此小儿全麻诱导期间容易发生缺氧。有上呼吸道感染的小儿无通气时血红蛋白去饱和的速度则更快[1]。全麻诱? Children are not shrinking adults. Compared with adults, children have less oxygen reserve, and high metabolic rate. At the same time, children with large tongue, head large, short neck, glottis position is high, resulting in pediatric endotracheal intubation glottic exposure difficulties, and sometimes takes a long time to operate, so prone to hypoxia during induction of general anesthesia in children. In children with upper respiratory tract infection, hemoglobin is more rapidly desorbed without ventilation [1]. General anesthesia lure?