The hyomental distance ratio



 The hyomental distance ratio (HMDR) is the ratio between the hyomental distance (HMD) (the distance between the hyoid bone and the tip of the chin) at the extreme of head extension (HMDe) and the one in the neutral position (HMDn). 

HMDR values ≤ 1.2 as a reliable predictor of difficult intubation.


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