Miller Straight Blade vs Macintosh Blade

Not Applicable

Completed

• Conditions: Intubation; Difficult
• Interventions: Other: Miller group; Other: Macintosh group

• Registration Number: NCT02664532
• Lead Sponsor: Tata Main Hospital

Brief Summary

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.

Detailed Description

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 Timeline

• Study Start: 2010-01
• Primary Completion: 2010-12
• Study Completion: 2010-12
• Study First Submitted: 2016-01-10
• Study First Submitted QC: 2016-01-22
• Study First Posted: 2016-01-27
• Status Verified: 2016-02
• Results First Submitted: 2016-02-12
• Results First Submitted QC: 2016-02-12
• Last Update Submitted: 2016-02-12
• Results First Posted: 2016-03-11
• Last Update Posted: 2016-03-11

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 150

Inclusion Criteria

• All ASA I & II grade patients undergoing elective surgery requiring general anesthesia with oral endotracheal intubation

Exclusion Criteria

• Patients with anticipated difficult airway
• Cervical spine disorders
• Anesthesia requiring rapid sequence induction

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Miller group	Miller group	In Miller group, no 3 Miller blade was used for laryngoscopy by paraglossal technique. While intubating, the endotracheal tube (ETT) was directed underneath the laryngoscope blade without allowing it to go lateral to the blade. The curvature of the ETT automatically brings the tip towards the vocal cords as it was advanced. After successful endotracheal intubation, the ETT was attached to the circuit and anaesthesia continued as per plan.
Macintosh group	Macintosh group	In Macintosh group, the curved blade was introduced to lift the base of the epiglottis to visualize larynx and then trachea intubated conventionally.After successful endotracheal intubation, the ETT was attached to the circuit and anaesthesia continued as per plan.

Primary Outcome Measures

Name	Time	Method
Ease of Intubation or Degree of Difficulty With Intubation	60 seconds	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

Secondary Outcome Measures

Name	Time	Method
Total Laryngoscopy Duration in Seconds	180 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.
Number of Intubation Attempts	180 seconds	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.
Cormack Lehane Grading	60 seconds	Grade 1 Full view of glottis Grade 2 Only posterior commissure visible Grade 3 Only epiglottis visible Grade 4 No glottis structure visible