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Category: Volume 10 Issue 03 March 2022
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Title: Performance of Ultrasound Based Quantification of Hyomental Distance Ratio in Predicting Difficult Airway in Anaesthesia

Authors: Dr Amutha Rani R, Dr K. Chandra

 DOI: https://dx.doi.org/10.18535/jmscr/v10i3.16

Abstract

Background: HMDR is used to predict a difficult airway preoperatively

Aim: The aim of the study is to predict difficult airway in non obese population using hyomental distance. To correlate cormack- lehane with HMD ratio

Methods: Mallampati class & ULBT score recorded pre operatively. HMDe & HMDn distance measured in 2 positions using 5MHZ curvilinear ultrasonogram transducer. HMD ratio calculated. Pre-epiglottic soft tissue thickness at level of thyrohyoid membrane with linear 10 MHZ transducer

Patient premedicated, induced & adequate muscle relaxation was given. Macintosh laryngoscope blade 3 & 4 size introduced to visualize the glottis structures. Difficult intubation will be assessed using Cormack-lehane grading

Results: Total of 100 patients were included in the study, 52 patients were male and 48 patients were female. 51% of study population comes under overweight group. 56% of study population falls under mallampatti grade 2. 61% of study population has HMDe >5.3. 61% of study population has HDMn>5.5. 60% of study group has HDM ratio >1.2. Difficult intubation was seen among 38% of study population.

Keywords: Difficult airway, HMD ratio, cormack-lehane score , ultrasound.

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Corresponding Author

Dr Amutha Rani R MD

Prof & HOD, Department of Anaesthesiology, Tirunelveli Medical College