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Updated: Mar 8, 2026

Point-of-Care Ultrasound: A Review of Ultrasound Parameters for Predicting Difficult Airways
Published on: April 7, 2023
Comments to Role of upper airway ultrasound in airway management
1Department of Emergency Medicine, College of Medicine, National Taiwan University and National Taiwan University Hospital, Hsin-Chu Branch, No.25, Lane 442, Sec.1, Jingguo Rd, Hsinchu City 300, Taiwan.
Abstract:
Tracheal ultrasound can be an alternative diagnostic tool in airway management, besides traditional confirmatory methods such as capnography and auscultation. The standard image is a hyperechoic air-mucosa (A-M) interface with a reverberation artifact posteriorly (comet-tail artifact). If the second A-M interface appears, which we call a "double-tract sign," esophageal intubation is considered.
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