Study links canine TEER to improved myocardial work
Bottom line
A new small prospective study suggests transcatheter edge-to-edge repair, or TEER, may do more than reduce mitral regurgitation in dogs with myxomatous mitral valve disease. In the preprint, posted May 20, 2026, investigators at Kasetsart University reported outcomes in 10 client-owned dogs with moderate-to-severe mitral regurgitation treated under multimodal imaging guidance. Mitral regurgitation severity, vena contracta width, and regurgitant volume fell after the procedure and remained improved at two months, while left atrial and left ventricular dimensions also decreased. The authors also found improved myocardial work indices, including higher global work index and myocardial work efficiency, even as global longitudinal strain became less negative after repair. The paper has not yet been peer reviewed, and only six dogs completed follow-up assessments. (preprints.org)
Why it matters: For veterinary professionals, the study adds early physiologic evidence that TEER may improve ventricular mechanics as well as valve leakage in selected dogs with MMVD. That could matter because MMVD remains the most common canine heart disease, and TEER is emerging as a less invasive option for severe mitral regurgitation in referral settings. Still, the findings should be read cautiously: four of the 10 dogs died during follow-up, the myocardial work analysis was adapted from human cardiology software that is not yet validated across dog breeds, and the authors say longer-term effects of higher transmitral gradients after TEER remain unknown. Larger published datasets from referral practice have shown encouraging intermediate outcomes, but they also underscore the importance of case selection, procedural experience, and comparison with medical therapy alone. (colab.ws)
What to watch: Watch for peer review of this manuscript, longer follow-up on survival and heart failure progression, and more data on which canine anatomies benefit most from TEER. (preprints.org)
Key facts
- Study type
- Small prospective preprint
- Posted
- May 20, 2026
- Institution
- Kasetsart University
- Sample size
- 10 client-owned dogs
- Condition
- Myxomatous mitral valve disease with moderate-to-severe mitral regurgitation
- Procedure
- Transcatheter edge-to-edge repair, or TEER
- Main finding
- Mitral regurgitation severity, vena contracta width, and regurgitant volume fell after TEER and stayed improved at two months
- Other finding
- Left atrial and left ventricular dimensions decreased after the procedure
- Limitation
- Only six dogs completed follow-up, and four died during follow-up
A new canine cardiology study points to a potentially important next step in evaluating transcatheter edge-to-edge repair for dogs with myxomatous mitral valve disease: not just whether the procedure reduces mitral regurgitation, but how the ventricle responds afterward. In a preprint posted May 20, 2026, researchers reported that TEER in 10 client-owned dogs with moderate-to-severe mitral regurgitation was associated with immediate and short-term reductions in regurgitation severity, along with improved myocardial work indices that may reflect better ventricular efficiency after unloading. The work is preliminary and not yet peer reviewed, but it adds mechanistic detail to a fast-moving area of interventional veterinary cardiology. (preprints.org)
That context matters because MMVD is the leading acquired heart disease in dogs, and standard management has historically centered on staging and medical therapy under ACVIM guidance. Over the past several years, TEER has started to move from experimental work toward clinical use in select referral centers, especially for dogs with severe mitral regurgitation and anatomy suitable for device placement. Colorado State University, for example, now describes the procedure as a minimally invasive beating-heart option performed through a transapical approach with fluoroscopic and transesophageal echocardiographic guidance using the V-Clamp device. (colab.ws)
The new study comes from Kasetsart University and enrolled 10 client-owned dogs with MMVD and moderate-to-severe mitral regurgitation. According to the manuscript, all underwent TEER with multimodal imaging guidance. The authors reported significant decreases in mitral regurgitation severity score, vena contracta width, and regurgitant volume immediately after intervention, with improvement maintained at a two-month follow-up. Left atrial and left ventricular dimensions also fell, suggesting early reverse remodeling after the procedure. (preprints.org)
What sets this report apart is its focus on myocardial work. The authors found that global work index, global constructive work, and global work efficiency improved after TEER, while global wasted work decreased. In the manuscript’s reported values, global work index increased from 383 mmHg% before intervention to 927 mmHg% immediately after, then to 1003 mmHg% at two months, while global work efficiency improved from 82% to 90% and remained 89% at follow-up. Global longitudinal strain became less negative after TEER, which the authors interpret as a sign of normalized loading conditions rather than worsening systolic function. (preprints.org)
The paper also highlights the limits of the evidence. Only six of the 10 dogs completed echocardiographic and myocardial work follow-up, because four died during the follow-up period. The authors explicitly caution that the small sample, survivor bias, and lack of long-term data make the associations between mitral regurgitation reduction, remodeling, and myocardial work difficult to interpret with confidence. They also note that the myocardial work analysis was adapted from human cardiology methods and is not yet standardized or validated across breeds and body sizes in dogs. (preprints.org)
Even so, the findings fit with the broader trajectory of TEER research in dogs. Earlier reports established procedural feasibility and short-term efficacy, while a larger 111-dog prospective study published in the Journal of Veterinary Cardiology found one-clamp technical feasibility of 97.3%, in-hospital mortality of 6.3%, one-year freedom from all-cause mortality of 75%, and sustained reductions in regurgitant fraction and chamber dimensions through one year. That larger study concluded TEER likely offers benefit as an adjunct to medical therapy, while also calling for better consistency in mitral regurgitation reduction, fewer procedural complications, and prospective comparisons with medical management. (frontiersin.org)
Why it matters: For veterinary professionals, this study suggests myocardial work analysis could become a useful adjunct endpoint when monitoring dogs after mitral intervention, especially in cases where conventional strain measures are hard to interpret because loading conditions shift abruptly after repair. It also reinforces a practical point already emerging from clinical programs: TEER is not a general replacement for standard MMVD care, but a specialized referral procedure whose value depends heavily on anatomy, imaging, operator experience, and careful case selection. In other words, the conversation may be shifting from “can we place the device?” to “which dogs truly benefit, and how should success be measured?” (preprints.org)
What to watch: The next milestones are peer-reviewed publication of these data, longer-term follow-up tying myocardial work changes to survival or heart failure outcomes, and clearer selection criteria for dogs with favorable versus unfavorable anatomy. Those issues are already being flagged by both the authors and clinical programs offering TEER, and they’re likely to shape whether the procedure remains a niche intervention or becomes a more established part of advanced canine cardiology practice. (preprints.org)