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Can thyromental distance be measured accurately?
Bin Wang1, Hui Peng2, Weidong Yao3
1Department of Anesthesiology, Wannan Medical College First Affiliated Hospital, Yijishan Hospital, Wuhu, China.
Journal of Clinical Monitoring and Computing
|December 14, 2017
Summary
Surface landmark identification for thyromental distance (TMD) measurement is often inaccurate, particularly for women. Anesthetist resident experience did not significantly improve TMD measurement accuracy.
Area of Science:
- Anesthesiology
- Medical Education
- Diagnostic Accuracy
Background:
- Thyromental distance (TMD) is a critical measurement in airway assessment.
- Accurate TMD measurement relies on precise identification of anatomical landmarks.
- Ultrasonography offers a precise method for anatomical localization.
Purpose of the Study:
- To evaluate the accuracy of thyromental distance (TMD) measurement using surface landmark identification compared to ultrasonographic guidance.
- To determine the impact of clinical experience on TMD measurement accuracy among anesthesia residents.
Main Methods:
- Twenty-nine anesthesia residents measured TMD on 28 volunteers using surface landmarks.
- Thyroid cartilage prominence was precisely identified using ultrasonography.
- Measurement error was defined as a difference >5.4 mm compared to ultrasound-based TMD.
Main Results:
- The overall measurement error rate for TMD using surface landmarks was significant.
- Females exhibited a significantly higher TMD measurement error rate (50%) compared to males (10%).
- Error rates for first-year (34%), second-year (27%), and third-year residents (31%) were not significantly different.
Conclusions:
- Surface landmark identification for TMD measurement is unreliable, with higher error rates in females.
- Anesthesia resident experience does not improve the accuracy of TMD measurement by surface landmark identification.
- Ultrasonographic guidance may be beneficial for accurate TMD assessment.
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