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KMID : 0356920080540030267
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Korean Journal of Anesthesiology
2008 Volume.54 No. 3 p.267 ~ p.270
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Induction Time Required for Successful Laryngeal Mask Airway Insertion with Sevoflurane and No Muscle Relaxant in Children
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Kim Kyoung-Ok
In Jun-Yong
Cho Hun
Chung Seung-Hyun
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Abstract
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Background :The laryngeal mask airway (LMA) is a simple and safe method for airway control in children.We therefore determined, with meaningful confidence intervals, the time required for successful insertion of LMA in 95% of children with 8 vol% inspired sevoflurane and no muscle relaxant.
Methods :Forty-six patients, ASA physical status I or II, aged 12?108 months old who were scheduled to undergo elective surgery were included.Patients received 5 mg/kg of thiopental and 0.02 mg/kg of atropine intravenously.After loss of the eye lid reflex, we applied an anesthesia circuit prefilled with 8 vol% dialed sevoflurane in 100% O2.A classic LMA (# 2) insertion was attempted after a predetermined induction time.A probit analysis was used to determine the induction time required to achieve 50% and 95% success rates during LMA insertion.
Results :A probit model of induction time was predictive of successful intubation (P = 0.155).The induction times needed to achieve 50% and 95% successful LMA insertion were 125 s (95% confidence interval, 52?146 s) and 208 s (178?382 s), respectively.
Conclusion :Ninety five percent success can be obtained with approximately 208 s for ages one to 9 years with classic LMA (# 2).The induction time can vary by LMA size and induction methods.Therefore further studies using different sizes of LMA and induction methods are needed.(Korean J Anesthesiol 2008; 54: 267∼70)
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KEYWORD
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children, induction time, laryngeal mask airway
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