Comparison of Intubation Rate of Macintosh Size 2 and 3 Blades in Asian Female: a Randomised Controlled Trial

M

Mackay Memorial Hospital

Status

Completed

Conditions

Intubation;Difficult

Treatments

Device: Macintosh size 3 blade
Device: Macintosh size 2 blade

Study type

Interventional

Funder types

Other

Identifiers

NCT04566224
11MMHIS107

Details and patient eligibility

About

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.

Full 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.

Enrollment

90 patients

Sex

Female

Ages

20 to 70 years old

Volunteers

No Healthy Volunteers

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

Trial design

Primary purpose

Prevention

Allocation

Randomized

Interventional model

Parallel Assignment

Masking

Double Blind

90 participants in 2 patient groups

Macintosh 2 group
Experimental group
Description:
Using Macintosh size 2 blade for direct laryngoscope intubation according to randomization
Treatment:
Device: Macintosh size 2 blade
Macintosh 3 group
Active Comparator group
Description:
Using Macintosh size 3 blade for direct laryngoscope intubation according to randomization
Treatment:
Device: Macintosh size 3 blade

Trial contacts and locations

0

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Data sourced from clinicaltrials.gov

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