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Korean Journal of Anesthesiology 2008;54(3):267-270.
DOI: https://doi.org/10.4097/kjae.2008.54.3.267   
Induction Time Required for Successful Laryngeal Mask Airway Insertion with Sevoflurane and No Muscle Relaxant in Children.
Kyoung Ok Kim, Seung Hyun Chung, Jun Yong In, Hun Cho
Department of Anesthesiology and Pain Medicine, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Goyang, Korea. pissces@medimail.co.kr
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.
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.
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.
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.
Key Words: children; induction time; laryngeal mask airway


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