Flexible LMA (Laryngeal mask airway) is very useful for variable situation but it is hard to insert in correct position because of it's flexible structure. Especially in classical way of manual LMA insertion, when the index finger could not guide the flexible LMA to the optimal position, we could not guarantee the correct position of the LMA. Therefore several studies have been investigated to improve this. The light wand is a kind of stylet which have a light on the tip. Recently some studies demonstrated the usefulness of the light wand which could be used for indicating correct position of the LMA. We hypothesised there will be two advantages if the light wand is used as a stylet of the flexible LMA. First the stylet could support the mildness of the flexible LMA, and second the lightness could confirm the correct position of the flexible LMA.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
DOUBLE
Enrollment
54
The light wand is used as a stylet of the flexible LMA. When the investigator inserts the flexible LMA in "light wand group", the correct position of the LMA is confirmed by the light.
Ajou University Hospital
Suwon, Gyeonggido, South Korea
Oropharyngeal leak pressure
The oropharyngeal leak pressure is measured by the pressure which the investigator could detect the audible sound by stethoscope on patient's cheek during the exhaust valve is closed and the fresh gas is allowed to flow into the lungs at 3 liters per minute.
Time frame: 5 minutes after LMA is inserted
The grade of oropharyngeal view through the fiberoptic assessment
The position of the LMA was assessed by fiberoptic examination through an attachment between the LMA and the anesthetic circuit.
Time frame: 5 minutes after LMA is inserted
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