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World J Clin Cases. Mar 26, 2023; 11(9): 1951-1962
Published online Mar 26, 2023. doi: 10.12998/wjcc.v11.i9.1951
Airway ultrasound for patients anticipated to have a difficult airway: Perspective for personalized medicine
Harumasa Nakazawa, Kohji Uzawa, Joho Tokumine, Alan Kawarai Lefor, Akira Motoyasu, Tomoko Yorozu
Harumasa Nakazawa, Kohji Uzawa, Joho Tokumine, Akira Motoyasu, Tomoko Yorozu, Department of Anesthesiology, Kyorin University School of Medicine, Mitaka 181-8611, Tokyo, Japan
Alan Kawarai Lefor, Department of Surgery, Jichi Medical University, Shimotsuke 329-0498, Tochigi, Japan
Author contributions: Nakazawa H, Uzawa K, Motoyasu A and Tokumine J helped with literature acquisition and contributed in writing the original daft; Lefor AK contributed in editing the draft; Yorozu T helped in the conceptualization and data validation.
Conflict-of-interest statement: Authors declare no conflict of interests for this article.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Joho Tokumine, MD, PhD, Professor, Department of Anesthesiology, Kyorin University School of Medicine, 6-20-2 Sinkawa, Mitaka 181-8611, Tokyo, Japan. dg274825@cf6.so-net.ne.jp
Received: December 14, 2022
Peer-review started: December 14, 2022
First decision: January 19, 2023
Revised: January 28, 2023
Accepted: February 27, 2023
Article in press: February 27, 2023
Published online: March 26, 2023
Processing time: 92 Days and 21.3 Hours
Abstract

Airway ultrasound allows for precise airway evaluation, particularly for assessing the difficult airway and the potential for front of neck access. Many studies have shown that identification of the cricothyroid membrane by airway ultrasound is more accurate than digital palpation. However, no reports to date have provided clinical evidence that ultrasound identification of the cricothyroid membrane increases the success rate of cricothyroidotomy. This is a narrative review which describes patients with difficult airways for whom airway ultrasound may have been useful for clinical decision making. The role of airway ultrasound for the evaluation of difficult airways is summarized and an approach to the use of ultrasound for airway management is proposed. The goal of this review is to present practical applications of airway ultrasound for patients predicted to have a difficult airway and who undergo cricothyroidotomy.

Keywords: Airway ultrasound; Difficult airway; Point-of-care ultrasound; Cricothyroidotomy; Intubation; Mask ventilation

Core Tip: Airway ultrasound may provide a simpler and more accurate prediction of the difficult airway, especially to distinguish difficult mask ventilation from difficult tracheal intubation. Accurate cricothyroid membrane identification may provide a landmark for securing a surgical airway in clinical practice.