A radiographic measurement of left atrial size in dogs

Xavier Sánchez Salguero, David Prandi, Francisco Llabrés-DÍaz, Edgar Garcia Manzanilla, Claudio Bussadori

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)

Abstract

© 2018 The Author(s). Background: 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. Results: A positive correlation was observed between RLAD and LA/Ao (r = 0.82). RLAD's sensitivity and specificity for detecting LAE when evaluated at the optimal cut-off value, 1.8 vertebrae, were 93.5 and 96.8% respectively. RLAD showed high reproducibility and repeatability. Conclusion: RLAD appears to be a clinically useful radiographic measurement for evaluating left atrial dimensions. RLAD would provide clinicians with a simple and cost-effective tool for evaluating and monitoring LAE.
Original languageEnglish
Article number137
JournalIrish Veterinary Journal
Volume71
DOIs
Publication statusPublished - 17 Dec 2018

Keywords

  • Dog
  • Left atrial size
  • Mitral valve disease
  • Radiographic measurement

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