Abstract
Objective
To compare ultrasonography with computed tomography (CT) for assessment of tracheal
diameter as a feasibility study for endotracheal tube selection.
Study design
Prospective study.
Animals
A total of nine Beagle dogs with a median (interquartile range) weight of 7.4 (7.2–7.7)
kg.
Methods
Tracheal diameter measurements were obtained at two locations: 1 cm proximal to caudal
border of the cricoid cartilage (sublaryngeal; SL) and dorsal to above cranial border
of the manubrium (thoracic inlet; TI). For CT, dogs were anesthetized with propofol
and sevoflurane, in sternal recumbency, and measurements obtained after controlled
ventilation–induced apnea and the endotracheal tube cuff was deflated. Transverse
diameter, right and left 45° oblique diameters were measured. For ultrasonography,
unsedated dogs were standing with slight neck extension, and images obtained in ventrodorsal,
45° right and left oblique ways after expiration. Diameters between the tracheal lumen
mucosal borders were measured. The degree of agreement between the tracheal diameters
measured at SL and TI locations with CT (TDCT-SL and TDCT-TI) and ultrasonography (TDUS-SL and TDUS-TI) was verified using the Bland-Altman method.
Results
The agreement between the measurements obtained with CT and ultrasonography was revealed
by Bland-Altman analyses, although ultrasonography tended to slightly underestimate
the tracheal diameter.
Conclusions and clinical relevance
Ultrasonography can be applied for tracheal diameter measurement. Although further
studies are required, an endotracheal tube selection method, using ultrasonography,
could be proposed.
Keywords
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Article info
Publication history
Published online: July 13, 2022
Accepted:
July 7,
2022
Received in revised form:
July 7,
2022
Received:
February 9,
2022
Identification
Copyright
© 2022 Association of Veterinary Anaesthetists and American College of Veterinary Anesthesia and Analgesia. Published by Elsevier Ltd. All rights reserved.
