Cuff inflation up to the maximum cuff pressure when using LMA flexible can cause sore throat and discomfort after the surgery, and if the surgery is unexpectedly prolonged, there can be a side effect that can cause ischemic damage around the neck. If keeping cuff pressure low will not increase gastric insufflation and there is no change in other outcome variables, keeping it low may have a positive effect on anesthesia management and outcome in children.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
230
During the operation, cuff pressure of LMA flexible is maintained to 30cmH2O
During the operation, cuff pressure of LMA flexible is maintained to 50cmH2O
Incidence of gastric insufflation(antrum)
Incidence of gastric insufflation which was recognized in gastric antrum with ultrasound
Time frame: During the surgery(up to 3 hours)
The size of gastric antrum and body
The size of gastric antrum and body assessed immediately after insertion of LMA flexible and after finishing the surgery
Time frame: During the surgery(up to 3 hours)
Time for insertion of LMA flexible
Time for insertion of LMA flexible
Time frame: During the anesthesia induction(up to 1 hour)
Success rate of insertion of LMA flexible
Success rate of insertion of LMA flexible
Time frame: During the anesthesia induction(up to 1 hour)
The number of insertion attempt
The number of insertion attempt
Time frame: During the anesthesia induction(up to 1 hour)
The number and the type of additional manipulation for successful ventilation
The number and the type of additional manipulation for successful ventilation
Time frame: During the surgery(up to 3 hours)
Ease of insertion of LMA flexible
Ease of insertion of LMA flexible(very easy, easy, moerate, difficult, very difficult)
Time frame: During the anesthesia induction(up to 1 hour)
Incidence of gastric insufflation(body)
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Incidence of gastric insufflation which was recognized in gastric body with ultrasound
Time frame: During the surgery(up to 3 hours)
Incidence of gastric insufflation recognized with the ausculation
Incidence of gastric insufflation recognized with the ausculation after finishing surgery
Time frame: During the surgery(up to 3 hours)
peak pressure observed before, during, after surgery
peak pressure observed before, during, after surgery
Time frame: During the surgery(up to 3 hours)
oropharyngeal leak pressure
oropharyngeal leak pressure will be assessed by setting the APL valve of the circle system at 30 cmH2O with fresh gas flow of 3 L/min after the surgery
Time frame: During the surgery(up to 3 hours)
the complication rate
the complication rate such as desaturation, blood staining of LMA flexible, hoarseness, dental/lip/tongue injury, aspiration
Time frame: During the surgery and after surgery (up to 6 hours)