Redo mitral valve repair under repeat cardiopulmonary bypass in a dog

Objective To report the lifelong outcome of a redo mitral valve repair performed under repeat cardiopulmonary bypass (CPB) in a dog. Study design Case report. Animal An 11‐year‐old, 4.0‐kg neutered male Chihuahua, previously treated with surgical mitral valve repair for myxomatous mitral valve disease at the age of eight, presented with recurrent left heart failure caused by worsening residual mitral regurgitation (MR) following the initial repair. Methods Redo mitral valve repair was performed 2 years and 7 months after the initial surgery. The procedure, conducted under hypothermic CPB, involved adding and adjusting eight artificial chordae to align with the reconstructed mitral annular plane. Results The redo surgery successfully reduced MR, improved cardiac function, and resulted in more than 5 years of survival without MR recurrence. Conclusion This case demonstrates the feasibility of redo mitral valve repair in managing recurrent MR in dogs, highlighting its potential to improve long‐term outcomes in veterinary surgery and cardiology.