Hyomental Distance Ratio as a Diagnostic Predictor of Difficult Laryngoscopy

Rao, Sumesh T and Gowda, Vikas and Reddy, Rakesh V (2013) Hyomental Distance Ratio as a Diagnostic Predictor of Difficult Laryngoscopy. Indian Journal of Applied Research, 3 (8). pp. 511-513. ISSN 2249 - 555X

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Purpose: This study has been done to evaluate the usefulness of the Hyomental Distance Ratio (HMDR) for accurately predicting difficult visualization of the larynx (DVL) in apparently normal patients in comparison with other predictors. Methods: 198 apparently normal patients of more than 18 years of age, with ASA I and II, undergoing general anesthesia with tracheal intubation were evaluated. A hard-plastic bond ruler is used to measure the distance from the tip to the anterior-most part of the mentum was measured and defined as the Hyomental distance. After induction using thiopentone and paralysis using suxamethonium, glottic visualisation was assessed by using modified Cormach and Lehane classification without external laryngeal manipulation Results: The sensitivity of HMDR for predicting Difficult Laryngoscopy was 27.78% and specificity was 98.89%. The test has a positive predictive value of 71.43% , Negative predictive value of 93.19% Conclusion: HMDR is a clinically reliable predictor of DVL to certain extent because of its high specificity and negative predictive value. Seeking an optimal combination of tests that includes the HMDR and other predictors is recommended.

Item Type: Article
Uncontrolled Keywords: Hyomental Distance Ratio, Predicting Difficult Laryngoscopy
Subjects: Medicine > KMC Mangalore > Anaesthesiology
Depositing User: KMCMLR User
Date Deposited: 20 Aug 2013 10:23
Last Modified: 20 Aug 2013 10:23
URI: http://eprints.manipal.edu/id/eprint/136819

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