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Partial cuff inflation before insertion is generally used for laryngeal mask airway insertion in children. However, it is not proven how much the cuff should be inflated. The aim of this study is to compare efficacy between the method using the resting volume and the method using half the maximum volume for partial cuff inflation.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| resting volume group | Experimental |
| |
| maximum volume group | Active Comparator |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| The cuff inflation by the resting volume | Device | 80 patients are randomly allocated into two groups : resting volume group (n=40), half the maximum volume group (n=40). In the resting volume group, the pilot balloon valve is connected to syringe without piston for keeping the valve open to the atmosphere and allowing the pressure within the cuff of LMA to equalize with atmospheric pressure. In the half the maximum volume group, the cuff of LMA is completely emptied and then the cuff is filled with the half the maximum volume. |
| Measure | Description | Time Frame |
|---|---|---|
| The intra-cuff pressure | 1) After insertion of LMA, we confirm adequate ventilation. And then we measure intra-cuff pressure using cuff pressure manometer. 2) After confirming adequate ventilation, tidal volumes are measured using spirometer sensor attached anesthesia machine. Five corresponding inspiratory and expiratory tidal volumes are recorded and the difference between these is calculated as the leak volume. The time that measures the intra-cuff pressure and leak volume is approximately 5 to 10 minutes after insertion of LMA. | approximately 5 to 10 minutes after insertion of LMA. |
| The leak volume | 1) After insertion of LMA, we confirm adequate ventilation. And then we measure intra-cuff pressure using cuff pressure manometer. 2) After confirming adequate ventilation, tidal volumes are measured using spirometer sensor attached anesthesia machine. Five corresponding inspiratory and expiratory tidal volumes are recorded and the difference between these is calculated as the leak volume. The time that measures the intra-cuff pressure and leak volume is approximately 5 to 10 minutes after insertion of LMA. | approximately 5 to 10 minutes after insertion of LMA. |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Severance Hospital | Seoul | Seoul | 120-752 | South Korea |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 19413823 | Background | Wallace CJ, Chambers NA, Erb TO, von Ungern-Sternberg BS. Pressure volume curves of paediatric laryngeal mask airways. Anaesthesia. 2009 May;64(5):527-31. doi: 10.1111/j.1365-2044.2008.05819.x. |
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| The cuff inflation by the maximum volume | Device | 80 patients are randomly allocated into two groups : resting volume group (n=40), half the maximum volume group (n=40). In the resting volume group, the pilot balloon valve is connected to syringe without piston for keeping the valve open to the atmosphere and allowing the pressure within the cuff of LMA to equalize with atmospheric pressure. In the half the maximum volume group, the cuff of LMA is completely emptied and then the cuff is filled with the half the maximum volume. |
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