Thyromental distance is the distance between the chin and the thyroid cartilage (measured in finger breadths or cm). This exam can be used to assess mandibular space and compliance and to predict the ease of tongue displacement during direct laryngoscopy.

2023年8月17日 · The 3-3-2 rule evaluates 3 specific measurements, including the interincisor distance, hyoid-to-mental distance, and thyroid-to-hyoid distance. The study participants were categorized into 2 groups: the non-DA (NDA) and the DA groups.

Thyromental distance (TMD): Depending on the study, sensitivity is quoted to be between around 5% and 90%, specificity ranges from roughly 25% to 80%, and PPVs from about 15% to 40% have been found. TMJ mobility: Sensitivity is up to 30% at best, specificity is 85% to 90%.

Thyromental distance (TMD) measurement is a method commonly used to predict the difficulty of intubation [1] and is measured from the thyroid notch to the tip of the jaw with the head extended. [2] If it is less than 7.0 cm with hard scarred tissues, it indicates possible difficult intubation. [3]

What is Thyromental Distance? The thyromental distance (TMD) is a measurement that is used to quantify the horizontal distance between the inner surface of the mandible and the thyroid prominence when the neck and head are fully extended and the mouth is closed.

The distance should be seven centimeters or more—or approximately three finger widths. Fewer than three finger widths suggests difficult intubation, while two or fewer finger widths greatly increases the risk of encountering a difficult airway.

Using the thyromental distance (TMD) measured based on the ultrasonographic location of the thyroid cartilage prominence as the criterion, we investigated the accuracy of TMD measurement by surface landmark identification of the thyroid cartilage prominence.

2009年7月8日 · Thyromental distance (TMD) measurement is commonly used to predict difficult intubation. We surveyed anaesthetists to determine how this test was being performed. Comparative accuracy of ruler measurement and other forms of measurement were also assessed in a meta-analysis of published literature.

2023年7月19日 · Thyromental Distance: The thyromental distance measures the space between the thyroid notch and the mentum (lower jaw). A shorter distance is associated with a difficult airway. The test has a sensitivity of 44% to 55% and a specificity of 85% to 89%.

Recently introduced ratio of height to thyromental distance (RHTMD) is reported to have better predictability. We aimed to assess the prediction of difficult laryngoscopy by RHTMD and compared it with other indices.