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Updated: Jan 25, 2026
Author Spotlight: Advancing Awake Nasotracheal Intubation with Flexible Video Rhino-Laryngoscopes
Published on: August 2, 2024
A Prospective Crossover Study Evaluating the Efficacy of King Vision Video Laryngoscope in Patients Requiring General
Ramachandra R Avula1, Nagendra Nath Vemuri1, Rambabu Tallapragada1
1Department of Anaesthesia, MediCiti Institute of Medical Sciences, Medchal, Telangana, India.
Background:
Direct laryngoscopy used for tracheal intubation requires aligning the pharyngeal, laryngeal and oral axes to achieve a line of sight. Video laryngoscopy provides a better view of the glottis without the need for aligning the three axes.
Aims:
To evaluate the effectiveness of King vision laryngoscope over Macintosh laryngoscope in visualizing the glottis and intubating the trachea, when used on a same patient as in a cross over manner.
Settings And Design:
Department of Anaesthesia, Mediciti Institute of Medical Sciences, prospective crossover study conducted over a period of six months.
Subjects And Methods:
Sixty adult patients belonging to ASA physical status class I-II, requiring tracheal intubation were randomly assigned to intubation by King vision or Macintosh laryngoscope. Improvement, if any, in the Cormack-Lehane grading using the King vision scope, following initial grading with the Macintosh blade in the same patient was analyzed.
Statistical Analysis:
Mean and Standard deviation were calculated for different parameters under the study. Where appropriate, results were analyzed using the Mc Nemar χ2 test. A 'p' value less than 0.05 was considered statistically significant.
Results:
In the King Vision group, Cormack and Lehane grade improved in the majority (9/12) of patients in whom the initial Cormack and Lehane grade was >1 using the Macintosh blade.
Conclusions:
The use of the King vision blade significantly improved the laryngoscopic view over the Macintosh blade but the time for intubation was prolonged.
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