CT Imaging of Extraglottic Airway Device-Pictorial Review

Authors

Tatsuya Norii, Department of Emergency Medicine, University of New Mexico Health Sciences Center, MSC11 6025 Lomas Blvd NE, Albuquerque, NM, 87131-0001, USA. TaNorii@salud.unm.edu
Yohsuke Makino, Department of Forensic Medicine, The University of Tokyo, Tokyo, Japan
Kana Unuma, Department of Forensic Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
Natalie L. Adolphi, Center for Forensic Imaging, Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
Danielle Albright, Department of Emergency Medicine, University of New Mexico Health Sciences Center, MSC11 6025 Lomas Blvd NE, Albuquerque, NM, 87131-0001, USA
David P. Sklar, College of Health Solutions, Arizona State University, Phoenix, AZ, USA
Cameron Crandall, Department of Emergency Medicine, University of New Mexico Health Sciences Center, MSC11 6025 Lomas Blvd NE, Albuquerque, NM, 87131-0001, USA
Darren Braude, Department of Emergency Medicine, University of New Mexico Health Sciences Center, MSC11 6025 Lomas Blvd NE, Albuquerque, NM, 87131-0001, USA; Department of Anesthesiology, University of New Mexico Health Sciences Center, Albuquerque, NM, USA

Document Type

Article

Publication Date

6-1-2021

Abstract

Compared to intubation with a cuffed endotracheal tube, extraglottic airway devices (EGDs), such as laryngeal mask airways, are considered less definitive ventilation conduit devices and are therefore often exchanged via endotracheal intubation (ETI) prior to obtaining CT images. With more widespread use and growing comfort among providers, reports have now described use of EGDs for up to 24 h including cases for which clinicians obtained CT scans with an EGD in situ. The term EGD encompasses a wide variety of devices with more complex structure and CT appearance compared to ETI. All EGDs are typically placed without direct visualization and require less training and time for insertion compared to ETI. While blind insertion generally results in functional positioning, numerous studies have reported misplacements of EGDs identified by CT in the emergency department or post-mortem. A CT-based classification system has recently been suggested to categorize these misplacements in six dimensions: depth, size, rotation, device kinking, mechanical blockage of the ventilation opening(s), and injury from EGD placement. Identifying the type of EGD and its correct placement is critically important both to provide prompt feedback to clinicians and prevent inappropriate medicolegal problems. In this review, we introduce the main types of EGDs, demonstrate their appearance on CT images, and describe examples of misplacements.

Recommended Citation

Norii T, Makino Y, Unuma K, Adolphi NL, Albright D, Sklar DP, Crandall C, Braude D. CT imaging of extraglottic airway device-pictorial review. Emerg Radiol. 2021 Jun;28(3):665-673. doi: 10.1007/s10140-021-01909-2. Epub 2021 Feb 2. PMID: 33532932.