The Difference of Oropharyngeal Leak Pressure and Sealing Pressure Between New Supraglottic Airway Devices

Study Overview
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Brief Summary
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The difference of oropharyngeal leak pressure and sealing pressure between new supraglottic airway devices.

Detailed Description
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In this clinical study, investigators want to discuss the issue that oropharyngeal leak pressure and sealing condition with different SGA including air-Q、i-gel、LMA-supreme、AMBU auragain 、ProSeal LMA and other new SGAs. In the perioperative period, investigators documented respiratory function data including oropharyngeal leak pressure and peak airway pressure in these randomly selected SGA. Oropharyngeal leak pressure was measured by closing the expiratory valve of the circle system at fixed O2 flow 3L/min and noting the airway pressure at which the dial on a calibrated aneroid manometer reached equilibrium. investigators wanted to compared the respiratory function between air-Q、i-gel、LMA-supreme、AMBU auragain、ProSeal LMA and other new SGAs during surgery and postoperative care unit.

Official Title
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The Difference of Oropharyngeal Leak Pressure and Sealing Pressure Between New Supraglottic Airway Devices

Conditions
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Oropharyngeal Leak Pressure

Participation Criteria
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Eligibility Criteria
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Inclusion criteria: 20-80 years old. ASA physical status I or II . Without major organ dysfunction like heart, liver, brain, lung, kidney function failure. Exclusion criteria: BMI> 35 kg/m2. Risk of aspiration(NPO clear water> 2 hours, solid foods > 8 hours). Difficult airway like head and neck tumor or airway tumor. Limited mouth opening (<2cm). major organ dysfunction including heart, liver, brain, lung, kidney function failure. Major surgery including open heart surgery, laparotomy general surgery, open chest surgery.

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| SGA type 1<br>Observe the function of SGA type 1 | |
| SGA type 2<br>Observe the function of SGA type 2 | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Oropharyngeal leak pressures | oropharyngeal leak pressure units ( cmH2O ) | 10 minutes | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| 1. The participant's head and neck position 2. The number of attempts required for SGA insertion 3. Ease of gastric tube placement 4. The ventilation score | The participant's head and neck position (neutral/extension/flexion/rotation) The number of attempts required for SGA insertion (1/2/3/tracheal intubation) Ease of gastric tube placement (success/failure/Leak) The ventilation score was scored from 0 to 3 based on three criteria: (1) No leakage with an airway pressure of > 15 cm H2O (2) Bilateral chest excursions with a peak inspiratory pressure of > 20 cm H2O (3) A Square Wave Capnography with each item scoring 0 or 1 point. Thus, if all three criteria were satisfied, the ventilation score was 3. | 180 minutes | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Supraglottic airway (SGA) devices