Peer-reviewed veterinary case report
How vets measure mitral valve leakage severity in dogs with heart
By Del Nero, B et al.Ā·Published in Journal of veterinary cardiology : the official journal of the European Society of Veterinary CardiologyĀ·2025Ā·Department of Clinical Sciences, United StatesĀ·View original on PubMed ā
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Original publication title: Quantitative methods for evaluation of mitral regurgitation severity in canine degenerative mitral valve disease.
- Species:
- dog
Plain-English summary
A group of 51 dogs with degenerative mitral valve disease (DMVD) were evaluated for the severity of mitral regurgitation (MR), a condition where blood leaks backward into the heart. The dogs were at different stages of the disease, and two different echocardiographic methods were used to measure the severity. The results showed that as the disease progressed, the severity of MR increased significantly. However, the two methods used to measure MR were not interchangeable, meaning that they provided different results. Understanding the severity of MR can help veterinarians decide on the best treatment options for affected dogs.
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Abstract
INTRODUCTION/OBJECTIVES: Quantitative assessment of mitral regurgitation (MR) severity has become increasingly important as procedural therapies for MR reduction become available. This study aimed to obtain quantitative measures of MR severity across stages of degenerative mitral valve disease (DMVD) and evaluate agreement between two echocardiographic methods. ANIMALS, MATERIALS AND METHODS: Fifty-one client-owned dogs were included across three DMVD stages (American College of Veterinary Internal Medicine B1, B2, and C). Regurgitant volume (RVol) and regurgitant fraction (RF) were measured on echocardiograms prospectively acquired by a single cardiologist using volumetric (using Simpson's method of discs) and proximal isovelocity surface area (PISA) methods. Results were compared across stages. Agreement between methods over the range of MR severity was determined by Bland-Altman analyses. Intra-observer and inter-observer measurement variability assessments were performed via intraclass correlation coefficients (ICCs). RESULTS: Median differences (25th percentile, 75th percentile) for volumetric and PISA-derived RVol and RF were as follows, respectively: B1: 0.19 mL/kg (-0.02 mL/kg, 0.25 mL/kg), 13.6% (-2.17%, 20.6%); B2: 1.49 mL/kg (1.09 mL/kg, 2.12 mL/kg), 55.6% (45.0%, 70.5%); C: 2.72 mL/kg (1.76 mL/kg, 3.13 mL/kg), 67.2% (61.8%, 78.5%); B1: 0.39 mL/kg (0.22 mL/kg, 0.69 mL/kg), 34.3% (19.0%, 56.1%); B2: 1.67 mL/kg (1.33 mL/kg, 2.15 mL/kg), 58.8% (49.8%, 73.9%); C: 3.1 mL/kg (1.91 mL/kg, 3.57 mL/kg), 75.2% (66.4%, 92.0%). All were different (P<0.0001) across stages. There was no proportional bias for RVol or RF (P=0.79, P=54). Intra-observer and inter-observer variability assessments showed ICC greater than 0.75 except PISA RF. CONCLUSIONS: Measures of MR severity correlate with disease stage, although their accuracy remains unknown. Volumetric and PISA methods are not interchangeable.
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Search related cases āOriginal publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/39914360/