Ozlü O, Ocal T
Department of Anaesthesia, SSK Children Hospital, Ankara, Turkey.
Paediatr Anaesth. 1999;9(5):409-13. doi: 10.1046/j.1460-9592.1999.00393.x.
Endtidal CO2 (PECO2) and arterial blood gas tensions were compared between laryngeal mask (LMA) and face mask (FM) ventilation in paediatric outpatients. Following premedication with midazolam, anaesthesia was induced with either thiopentone or isoflurane and atracurium. Anaesthesia was maintained with N2O, O2 and isoflurane. Manually controlled ventilation was applied with a nonrebreathing system. Both PECO2 and arterial blood gas tensions were measured at 5 and 15 min after skin incision. The mean PaCO2 values in the LMA group were 36.6+/-7.4 and 37.5+/-6.4 mmHg and PaCO2 -PECO2 were 1. 8+/-2.4 and 2.5+/-3.3 mmHg, respectively. The mean PaCO2 values in the FM group were 41.3+/-8.1 and 43.4+/-8.9 mmHg; and PaCO2 -PECO2 were 5.3+/-3.6 and 8.8+/-7.0 mmHg, respectively. These values were lower in the LMA group (P< 0.05). We have concluded that monitoring of PECO2 is more reliable for estimating blood gas values during controlled ventilation with a LMA than a face mask.
比较了小儿门诊患者使用喉罩（LMA）和面罩（FM）通气时的呼气末二氧化碳分压（PECO2）和动脉血气张力。在使用咪达唑仑进行术前用药后，用硫喷妥钠或异氟烷及阿曲库铵诱导麻醉。用氧化亚氮、氧气和异氟烷维持麻醉。采用非重复吸入系统进行手动控制通气。在皮肤切开后5分钟和15分钟时测量PECO2和动脉血气张力。LMA组的平均动脉血二氧化碳分压（PaCO2）值分别为36.6±7.4和37.5±6.4 mmHg，PaCO2-PECO2分别为1.8±2.4和2.5±3.3 mmHg。FM组的平均PaCO2值分别为41.3±8.1和43.4±8.9 mmHg；PaCO2-PECO2分别为5.3±3.6和8.8±7.0 mmHg。LMA组的这些值较低（P<0.05）。我们得出结论，在使用LMA进行控制通气时，监测PECO2比使用面罩更可靠地估计血气值。
