This work was started at Dip Patologia Animale, University of Torino. Analysis of data has been performed at Kansas State University.
Survival Characteristics and Prognostic Variables of Dogs with Preclinical Chronic Degenerative Mitral Valve Disease Attributable to Myxomatous Degeneration
Article first published online: 23 DEC 2011
Copyright © 2011 by the American College of Veterinary Internal Medicine
Journal of Veterinary Internal Medicine
Volume 26, Issue 1, pages 69–75, January-February 2012
How to Cite
Borgarelli, M., Crosara, S., Lamb, K., Savarino, P., La Rosa, G., Tarducci, A. and Haggstrom, J. (2012), Survival Characteristics and Prognostic Variables of Dogs with Preclinical Chronic Degenerative Mitral Valve Disease Attributable to Myxomatous Degeneration. Journal of Veterinary Internal Medicine, 26: 69–75. doi: 10.1111/j.1939-1676.2011.00860.x
Preliminary data were presented at the 17th ECVIM-CA Congress September 13–15, 2007, Budapest, Hungary.
- Issue published online: 10 JAN 2012
- Article first published online: 23 DEC 2011
- Manuscript Accepted: 21 NOV 2011
- Manuscript Revised: 19 OCT 2011
- Manuscript Received: 22 FEB 2011
- Regione Piemonte
- Heart failure;
- Valvular disease
Preclinical myxomatous mitral valve degeneration (MMVD) includes a heterogeneous group of dogs. Therefore, identifying risk factors for progression of the disease is of clinical importance.
To investigate survival time and risk factors for clinical and echocardiographic variables taken at initial examination for clinical progression in preclinical MMVD dogs.
A total of 256 dogs with stage B1 or B2 MMVD.
Materials and Methods
Medical records of 256 dogs with preclinical MMVD were reviewed retrospectively. Long-term outcome was assessed by telephone interview. Dogs alive at the time of phone interview were asked to return to the hospital for re-evaluation of their cardiac status.
Seventy of 256 (27.3%) dogs died during the observation period. The median survival time, regardless of cause of death, was 588 (range 75–1,668) days. The presence of a murmur was associated with an increased risk of death (AHR 2.14; 95% CI 1.12, 4.11; P = 0.022). Thirty (12%) deaths were considered cardiac related. LA/Ao > 1.4 was the only negative predictor (AHR 2.64; 1.13, 6.13; P = 0.024) for cardiac-related deaths. Eighty-three dogs were re-examined, of which 34 progressed to a more advanced stage of MMVD. The presence of Emax > 1.2 (AHR 2.75; 95% CI 1.01, 7.48; P = 0.047) and cough (AHR 7.89; 95% CI 3.18, 20.07; P < 0.001) were significant in the multivariate analysis.
Conclusions and Clinical Importance
Preclinical MMVD represents a relatively benign condition in dogs. Clinicians might find stratification of this dog population according to risk factors based on clinical and echocardiographic findings helpful in determining treatment.