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Hyomental Distance in Neutral and Extension as a Clinically Reliable Predictor of Difficult Airway

Roopa Rani K., Door no 98, 9th cross, 8th Main Brindavan Nagar, Mattikere, Bengaluru, Karnataka Pin 560054. , Vikas K.N.* , Roopa Rani K.**

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Indian Journal of Anesthesia and Analgesia 4(2):p 483-486, April - June 2017. | DOI: http://dx.doi.org/10.21088/ijaa.2349.8471.4217.20

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Abstract

Aims: This study was been done with a purpose to evaluating the benifit of the Hyomental Distance [Hmd] neutral and extended position for predicting accurately difficult visualization of the larynx (DVL) in normal looking patients. Settings and Design: 198 normal looking patients ASA status I and II, scheduled to undergo general anesthesia and intubation were assessed. Each patient underwent a preanaesthetic assessment. Patients and Methods: A scale was used on the surface of the skin nearest to the hyoid bone, and the leanth from the nearest point mentum to the hyoid bone was measured and it was explained as the Hyo-mental distance at neutral position. After IV induction and paralysis, vocal cords visualisation was done and assessed by using Cormach and Lehane (C&L) classification. Statistical Analysis: was done using students‘t’ test and chi-square test. Results: The highest specificity of Hmd at the straight (neutral) position 98.89 % and Hmd at the head extension had a specificity of 95.56%. Conclusion: Hyo-mental Distance in straight and extended position are clinically reliable predictor of Dvl, because of their high specificity and negative predictive value .
 

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DOI: http://dx.doi.org/10.21088/ijaa.2349.8471.4217.20

Keywords

Hyo-Mental Distance; Difficult Visualization of Larynx; Cormach and Lehane (C&L) Classification and Difficult Airway.

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