General Anesthesia
Conditions
Brief summary
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.
Interventions
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.
PROCEDUREThe cuff inflation by half the maximum volume
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.
Sponsors
Yonsei University
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Masking
DOUBLE (Caregiver, Investigator)
Eligibility
Sex/Gender
ALL
Age
20 Years to 70 Years
Healthy volunteers
No
Inclusion criteria
* adult patients (20-70 years of age) scheduled for elective surgery undergoing general anesthesia using LMA-classic size 3-5
Exclusion criteria
* patients with an abnormal airway, * patients with reactive airway disease, * patients with gastroesophageal reflux disease, * patients with chronic respiratory disease, * or a history of an upper respiratory tract infection
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| The intra-cuff pressure | approximately 5 to 10 minutes after insertion of LMA. | After insertion of LMA, we confirm adequate ventilation. And then we measure intra-cuff pressure using cuff pressure manometer. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| leak volume | approximately 5 to 10 minutes after insertion of LMA. | 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. |
Countries
South Korea
Outcome results
None listed