Key result
Mitral valve replacement using a 19 mm mechanical valve allowed a 7-year-old Shih Tzu with severe mitral regurgitation to survive for 2 years and 1 month on long-term warfarin therapy.
Case Report (n=1)
Mitral valve replacement with a mechanical valve can be a viable surgical option for severe, refractory mitral regurgitation in small dogs, though thrombosis remains a significant risk.
Supports viability of mechanical MVR in small dogs with refractory MR; leaves open optimal anticoagulation and broader applicability.
A seven-year-old Shih Tzu with refractory repeated pulmonary edema and syncope was presented for surgical operation. From the results of cardiovascular examinations, the dog was diagnosed as severe mitral regurgitation (ACVIM consensus class D) and mild tricuspid regurgitation. The dog first underwent surgery with mitral valve plasty; however, the results were unsatisfactory due to severe damage of the whole mitral valve. The operation was quickly changed to mitral valve replacement using a mechanical valve (19 mm). The dog survived surgery and lived for 2 years and one month after operation using long-term anticoagulant (warfarin) therapy in spite of several thrombosis-related events.
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Taguchi et al. (2014) conducted a case report in Severe mitral regurgitation (n=1). Mitral valve replacement using a mechanical valve (19 mm) was evaluated on Survival. Mitral valve replacement using a 19 mm mechanical valve allowed a 7-year-old Shih Tzu with severe mitral regurgitation to survive for 2 years and 1 month on long-term warfarin therapy.
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