Correlation of Cardiac Enlargement as Assessed by Vertebral Heart Size and Echocardiographic and Electrocardiographic Findings in Dogs with Evolving Cardiomegaly Due to Rapid Ventricular Pacing
Article first published online: 28 JUN 2008
© 2001 American College of Veterinary Internal Medicine
Journal of Veterinary Internal Medicine
Volume 15, Issue 3, pages 217–221, May 2001
How to Cite
Nakayama, H., Nakayama, T. and Hamlinxya, R. L. (2001), Correlation of Cardiac Enlargement as Assessed by Vertebral Heart Size and Echocardiographic and Electrocardiographic Findings in Dogs with Evolving Cardiomegaly Due to Rapid Ventricular Pacing. Journal of Veterinary Internal Medicine, 15: 217–221. doi: 10.1111/j.1939-1676.2001.tb02314.x
- Issue published online: 28 JUN 2008
- Article first published online: 28 JUN 2008
- Revised June 4, August 11, October 11, 2000; Accepted December 4, 2000.
- Heart failure;
Vertebral heart size (VHS) has been proposed as a method for quantifying cardiomegaly in dogs. This study was designed to determine how well echocardiographic and electrocardiographic findings correlated with VHS. Dogs were rapid-paced into varying degrees of cardiomegaly and were monitored by thoracic radiography, echocardiography, and electrocardiography during development of cardiomegaly. Echocardiographic and electrocardiographic parameters were compared with VHS. VHS increased with increased duration or rate of pacing or both, and left atrium-to-aorta ratio, left ventricular end-diastolic diameter, left ventricular end-systolic diameter, P wave duration, and QRS duration correlated significantly with VHS. VHS (a score obtained from routine thoracic radiographs) seems to correlate well with both echocardiographic and electrocardiographic parameters. When 9 veterinarians, experienced in interpretation of cardiac silhouettes on radiographs, measured VHS from 1 normal dog and 1 dog with severe cardiomegaly, coefficients of variation (ratio of standard deviation to the mean) for their measurements were 2.7% and 2.8%, respectively. Thus, VHS could be established with great uniformity by experienced interpreters.