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KMID : 0376219920290020203
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Chonnam Medical Journal
1992 Volume.29 No. 2 p.203 ~ p.206
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Two cases of blind ureterocele with renal agenesis
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Abstract
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The induction of anesthesia is associated with a variable period apnea, During this time, safe apneic period to prevent hypoxemic event depend upon functional residual capacity and oxygen consumption which were different in ages.
To assess the safe duration of apnea and changes of blood gas during rapid sequence induction, 54 patients undergoing elective surgical procedures were allocated 5 groups according to age: group A(n=11) were within 15 years of age, group B(n=11)
were
between 16 and 30 years of age, group C(n=11) were between 31 and 45 years of age, group D(n=11) were between 45 and 60 years of age, group E(n=11) were above 61 years of age.
Patients were preoxygenated with 100% oxygen for 3 minutes. Anesthesia was induced with 3-4 mg/kg thiopental and 0.2mg/kg vecuronium. After endotracheal intubation, endotracheal tube was disconnected from anesthesia circuit until O2 saturation as
measured by pulse oximetry reached 90%.
In changes of arterial blood gas, decrease in pH and PaO2, increase in PaCO2 from 1 minute after apnea and decrease in SaO2 from 3 minute after apnea were noticed without settled interelation among groups.
Time for 1% decrease of SpO2 from initial value(SpO2-1) were 138.2±2.8, 283.2±19.9, 279.6±29.6, 253±30.0, 253±29.0 and 330.5±28.2 sec in A, B, C, D, E group, respectively. And safe duration of apnea(SpO2?0) was significantly shorter in
group
A(217.7±15.5 sec), compare with B, C, D and e groups(434.1±33.4, 408.1±24.5, 385±40, 453.2±33.3, respectively).
These results show that pediatric patients are at an increase risk of developing hypoxemia when apneic.
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