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Ambu AuraGain, I-gel, Air-Q intubating laryngeal airway are the most commonly used supraglottic airway. In children, they can be used as intubation conduits. However, there has been no guideline for optimal insertion depth of endotracheal tube through those supraglottic airway. In this study, the investigators will measure the distance from grille of those supraglottic airways to glottis using fiberoptic bronchoscope in children undergoing anesthesia. This distance allows us to predict an appropriate depth of endotracheal tube when it should be inserted through each supraglottic airway.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Ambu AuraGain | Experimental | Ambu AuraGain is inserted in children undergoing general anesthesia. The size of AuraGain is as follows: size 1 for children <5 kg, size 1.5 for 5-10kg, size 2 for 10-20kg, size 2.5 for 20-30kg. Fiberoptic bronchoscope will be performed to measure the distance between the grill and vocal cord. |
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| I-gel | Experimental | I-gel is inserted in children undergoing general anesthesia. The size of I-gel is as follows: size 1 for children weighing 2-5kg, size 1.5 for 5-12kg, size 2 for 10-25kg, size 2.5 for 25-35kg. Fiberoptic bronchoscope will be performed to measure the distance between the grill and vocal cord. |
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| Air-Q intubating laryngeal airway (ILA) | Experimental | Air-Q ILA is inserted in children undergoing general anesthesia. The size of Air-Q ILA is as follows: size 1 for children between 4-7 kg, size 1.5 for 7-17kg, size 2 for 17-30kg, size 2.5 for 30-50kg. Fiberoptic bronchoscope will be performed to measure the distance between the grill and vocal cord. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| fiberoptic bronchoscope | Procedure | Distance from grille (the end of shaft in supraglottic airway) to glottis is measured using FOB |
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| Measure | Description | Time Frame |
|---|---|---|
| The distance from grille to glottis | The distance from grille to glottis is measured using fiberoptic bronchoscopy | 30 seconds after each supraglottic airway insertion |
| Measure | Description | Time Frame |
|---|---|---|
| FOB view | score 1: no visible glottis, score 2: visible glottis and anterior epiglottis, score 3: visible glottis and posterior epiglottis, and score 4: only glottis visible | 30 seconds after each supraglottic airway insertion |
| Ventilation score |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Jin-Tae Kim, PhD | Seoul National University Hospital | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Seoul National University Hospital | Seoul | 110-744 | South Korea |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 31415305 | Derived | Lee JH, Park S, Jang YE, Kim EH, Kim HS, Kim JT. The distance between the glottis and the cuff of a tracheal tube placed through three supraglottic airway devices in children: A randomised controlled trial. Eur J Anaesthesiol. 2019 Oct;36(10):721-727. doi: 10.1097/EJA.0000000000001070. |
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no air leak in airway pressure of 15 cmH2O / bilateral chest wall movement/ normal waveform of capnography
| 30 seconds after each supraglottic airway insertion |