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A radiographic measurement of left atrial size in dogs

Salguero, X S; Prandi, D; Llabres-Diaz, F; Manzanilla, E G; Bussadori, C


X S Salguero

D Prandi

F Llabres-Diaz

E G Manzanilla

C Bussadori


The dimensions of the left atrium in cases with mitral regurgitation are an indirect measurement of its severity. The objective of this study was to evaluate the value of a new radiographic measurement, the radiographic left atrial dimension (RLAD), for detecting left atrial enlargement (LAE) in dogs. Thirty one dogs without LAE and 46 dogs with LAE were recruited in a prospective fashion. Reference left atrium dimension was measured by standard left atrium to aorta ratio (LA/Ao) by 2D echocardiography. LAE was considered if LA/Ao > 1.6. Left atrium dimension was then quantified on lateral radiographs by measuring RLAD. Vertebral heart size (VHS) was measured and RLAD was obtained by drawing a line bisecting the 90 degrees angle defined by the long and short cardiac axes lines of the VHS, up to the dorsal edge of the left atrium and comparing its length to T4’s vertebral body length. The correlation of VHS and RLAD methods with LA/Ao was estimated, as well as their sensitivity and specificity for detecting LAE. Receiver Operating Characteristic (ROC) curves were used to estimate the optimal decision criteria for each method.


Salguero, X. S., Prandi, D., Llabres-Diaz, F., Manzanilla, E. G., & Bussadori, C. (2018). A radiographic measurement of left atrial size in dogs. Irish Veterinary Journal, 71, 25.

Journal Article Type Article
Acceptance Date Dec 5, 2018
Publication Date Dec 17, 2018
Deposit Date Jun 6, 2019
Publicly Available Date Jun 6, 2019
Print ISSN 2046-0481
Publisher BioMed Central
Peer Reviewed Peer Reviewed
Volume 71
Pages 25
Public URL


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