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术目药能降低成人的PaO_2和SaO_2。絮绀型先天性心脏病(CCHD)儿童可能也有类似情况,虽未证实,但CCHD患儿用术前药后应该短时间吸纯氧。由于CCHD患儿需用较大剂量的术前药后以防止麻醉诱导时动脉血的血氧去饱和现象,因此这类患儿应在麻醉诱导前和诱导时充分供氧使SaO_2升高。CCHD患儿的SaO_2位于氧离曲线的陡直部分,PaO_2稍有变动即影响SaO_2,所以采用无创性脉冲式血氧计(pulse oximetry)就很有意义。作者选择11例紫绀型先心病择期作矫治手术的患儿观察SaO_2的变动。以自身作对照,分两阶段观察(每次90分钟)。手术前一天记录SaO_2(诱导前25.5小时开始)作对照,并与手术当天(诱导前1.5小时开始)的SaO_2进行比较。患儿均用N100型
Surgery drugs can reduce adult PaO_2 and SaO_2. Children with cyanotic congenital heart disease (CCHD) may have similar conditions, although not confirmed, but CCHD children with preoperative medicine should be a short time after inhalation of pure oxygen. Because CCHD children need larger doses of preoperative drugs to prevent arterial blood oxygen desaturation when anesthesia induction, so these children should be fully oxygenated before anesthesia induction and induction of SaO_2. SaO 2 in children with CCHD is located in the steep part of the oxygen dissociation curve, and slight changes in PaO 2 affect SaO 2, so it makes sense to use noninvasive pulse oximetry. The authors selected 11 patients with cyanotic congenital heart disease for elective surgery for observation of changes in SaO_2. To control itself, in two stages (each 90 minutes). SaO 2 (25.5 hours before induction) was recorded on the day before surgery as a control and compared with SaO 2 on the day of surgery (1.5 hours prior to induction). Children with N100 type