The purpose of this prospective open labeled randomized study was to compare the "laryngoscopic glottis view" as well as "ease of intubation" between the two blades in routine intubations in non-difficult airways.
One hundred and fifty patients with predicted non difficult airway were randomly assigned into two groups. After induction of anaesthesia laryngoscopy was performed with respective blades and trachea intubated. Parameters monitored were: glottis view obtained during laryngoscopy (Cormack Lehane grade), ease of intubation, intubation attempts, total duration of laryngoscopy in seconds and encountered complications.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Masking
NONE
Enrollment
150
Miller blade was used for laryngoscopy
Macintosh blade was used for laryngoscopy
Ease of Intubation or Degree of Difficulty With Intubation
Degree of difficulty with intubation Grade 1 Intubation easy Grade 2 Intubation requiring an increased anterior lifting force/optimal external laryngeal manipulation (OELM)/assistance to pull the right corner of the mouth upwards to augment space Grade 3 Intubation requiring more than one attempt or bougie guided intubation Grade 4 failure to intubate with the assigned laryngoscope
Time frame: 60 seconds
Cormack Lehane Grading
Grade 1 Full view of glottis Grade 2 Only posterior commissure visible Grade 3 Only epiglottis visible Grade 4 No glottis structure visible
Time frame: 60 seconds
Number of Intubation Attempts
An intubation attempt is defined as "intubation activities occurring during a single continuous laryngoscopy maneuver". Thus, even if several attempts were made to place an endotracheal tube during the course of a single laryngoscopy, this would be counted as a single intubation attempt.
Time frame: 180 seconds
Total Laryngoscopy Duration in Seconds
The duration of intubation was defined as the time taken from placement of the laryngoscope in the mouth to the time taken to remove the laryngoscope from the mouth following intubation.
Time frame: 180 seconds
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