a.1.(Anat.) Between the hyoid bone and the lower jaw, pertaining to them; suprahyoid; submaxillary; as, the hyomental region of the front of the neck.
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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).
Preoperative evaluation of extension capacity of the occipitoatlantoaxial complex in patients with rheumatoid arthritis: Comparison between the Bellhouse test and a new method, hyomental distance ratio.
Diagnostic predictor of difficult laryngoscopy: The hyomental distance ratio.
Submandibular sonography: Assessment of hyomental distances and ratio, tongue size, and floor of the mouth musculature using portable sonography.
Hyomental distance ratio as a diagnostic predictor of difficult laryngoscopy.
A comparison of between hyomental distance ratios, ratio of height to thyromental, modified Mallamapati classification test and upper lip bite test in predicting difficult laryngoscopy of patients undergoing general anesthesia.
5 cm, hyomental distance less than two large finger breadths, anteriorly tilted larynx and reduction of atlanto-occipital joint extension suggest difficult intubation.
21 Wojtczak's study22 showed that hyomental space measurements using USG can be useful in predicting difficult intubation.
Submandibular sonography: assessmentof hyomental distances and ratio tongue size and floorof the mouth musculature using portable sonography.
These include assessment of relative tongue pharyngeal size (Mallampati Classification)4 (Figure); atlanto-occipital extension in assuring sniff or Magil position 5 assessed by Wilson Risk Sum (Table); and Thyromental or hyomental distance to assess mandibular space (space anterior to larynx) with a ruler 6.
In our study, we tried to elucidate the role of ULBT as a simple bedside airway predictive test and other prevailing tests, the hyomental distance (HMD), thyrosternal distance (TSD), and the mandible length (ML) in predicting difficulty in endotracheal intubation.