Intubation;Difficult
Conditions
Keywords
Intubation rate, Macintosh blade, Asian women, intubation difficulty scale
Brief summary
Direct laryngoscope is a standard equipment for endotracheal intubation. To identify the differences between Macintosh size 3 and 2 blades, we will analysis the data collected from airway and intubation condition.
Detailed description
Selection the most appropriate size of laryngoscope blade size could not only increased intubation successful rate at the first time but also decrease the incidence of tissue trauma. Laryngoscope blade used in daily practice is usually Macintosh 3. However, compared with Caucasian people, Asian people are smaller and thinner especially in women. This study aims to confirm that the Macintosh 2 blade is not inferior to size 3 blade in laryngeal view and intubation rate. Female patients without known difficult airway will be enrolled and allocated into Macintosh blade size 2 and size 3 groups. The age, body weight, body height, Mallampati classification, mouth opening, thyromental distance, neck circumference, intubation time, Cormack-Lehane grade, intubation difficulty scale scores and associated teeth or tissue traumas will be recorded.
Interventions
DEVICEMacintosh size 2 blade
intubate with Macintosh size 2 blade
DEVICEMacintosh size 3 blade
intubate with Macintosh size 3 blade
Sponsors
Mackay Memorial Hospital
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
DOUBLE (Subject, Outcomes Assessor)
Eligibility
Sex/Gender
FEMALE
Age
20 Years to 70 Years
Healthy volunteers
No
Inclusion criteria
* with American Society of Anesthesiologists (ASA) physical status classification 1, 2, or 3 * undergo elective surgery * receive endotracheal intubation
Exclusion criteria
* with known difficult airway (i.e. pathology of the neck, upper airway or alimentary tracts) * with risks of pulmonary aspiration (i.e. emergent operation, pregnancy or inadequate nil per os) * with previous difficult intubation history * intubation attempts more than three times * patient refusal
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Intubation time | 0-10 minutes during induction | Time from laryngoscope insertion to the first adequate lung insufflation |
| Cormack-Lehane grade | 0-10 minutes during induction | Classification of glottis view during intubation |
| Intubation difficulty scale scores | 0-10 minutes during induction | Scoring system to assess the difficulty of intubation in each patient |
| Tissue trauma | 0-10 minutes during induction | Any tissue trauma event related to intubation |
| Teeth trauma | 0-10 minutes during induction | Any dental damage event related to intubation |
Countries
Taiwan
Outcome results
None listed