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Partial cuff inflation before insertion is generally used for laryngeal mask airway insertion in adult patients. 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 |
| |
| half the maximum volume group | Active Comparator |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| The cuff inflation by the resting volume | Procedure | 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 | After insertion of LMA, we confirm adequate ventilation. And then we measure intra-cuff pressure using cuff pressure manometer. | approximately 5 to 10 minutes after insertion of LMA. |
| Measure | Description | Time Frame |
|---|---|---|
| leak volume | 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. | 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 |
|---|---|---|---|
| 15710025 | Background | Al-Shaikh B, George William M, Van Zundert AA. Using atmospheric pressure to inflate the cuff of the Portex Laryngeal Mask. Anaesthesia. 2005 Mar;60(3):296-7. doi: 10.1111/j.1365-2044.2005.04135.x. No abstract available. | |
| 24360025 | Derived | Kim MS, Lee JR, Shin YS, Chung JW, Lee KH, Ahn KR. Comparison of 2 cuff inflation methods of laryngeal mask airway Classic for safe use without cuff manometer in adults. Am J Emerg Med. 2014 Mar;32(3):237-42. doi: 10.1016/j.ajem.2013.11.029. Epub 2013 Nov 21. |
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| The cuff inflation by half the maximum volume | Procedure | 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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