This is a randomized controlled study to compare the incidence of gastric insufflation when using high-flow nasal oxygenation and facemask ventilation in pediatric patients.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
SINGLE
Enrollment
70
100% oxygen supplied in proportion to body weight using the Optiflow THRIVETM system while maintaining jaw thrust. (0-12 kg; 2 L/kg/min, 13-15 kg; 30 L/min, 16-30 kg; 35 L/min, 31-50 kg; 40 L/min)
Mask ventilation using the one-hand E-C clamp technique and oropharyngeal airway (fresh gas flow 3 l/min, 100% O2, tidal volume 8-10 ml/kg, respiratory rate 20/min, I:E ratio 1:2, pop-off valve 13 cmH2O).
Incidence of gastric insufflation
Incidence of gastric insufflation detected by gastric ultrasound (acoustic shadow phenomenon or comet-tail artifact in the antrum) or by epigastric auscultation (typical 'gurgling' or 'whoosh' sound)
Time frame: From the start of anesthesia induction to 3 minutes after anesthesia induction
Gastric insufflation detected by ultrasound
Presence of acoustic shadow phenomenon or comet-tail artifact detected by ultrasound
Time frame: 3 minutes after anesthesia induction
Gastric insufflation detected by auscultation
Presence of 'gurgling' or 'whoosh' sound detected by auscultation of the epigastrium.
Time frame: From the start of anesthesia induction to 3 minutes after anesthesia induction
gastric antrum longitudinal diameter (D1)
gastric antrum longitudinal diameter (D1) measured by ultrasound
Time frame: 3 minutes after anesthesia induction
gastric antrum anteroposterior diameter (D2)
gastric antrum anteroposterior diameter (D2) measured by ultrasound
Time frame: 3 minutes after anesthesia induction
gastric antral cross-sectional area (CSA)
gastric antral cross-sectional area (CSA) measured by ultrasound (CSA = (D1 Ⅹ D2 Ⅹ π)/4)
Time frame: 3 minutes after anesthesia induction
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