Development of a flail mitral valve (MV) leaflet secondary to ruptured chordae tendineae in the setting of myxomatous mitral valve disease is a known complication of the disease that often results in severe mitral regurgitation. Two cases are presented in which a flail anterior MV leaflet caused severe mitral regurgitation and led to the development of congestive heart failure in male castrated Chihuahuas. Over variable periods of time, repeat cardiac evaluation disclosed reverse left-sided cardiac remodeling and lessened mitral regurgitation that allowed for withdrawal of furosemide in both dogs. While rare, improvement in mitral regurgitation severity may occur without surgical intervention, allowing for reverse left-sided cardiac remodeling and discontinuation of furosemide.

在粘液瘤性二尖瓣疾病中，继发于腱索破裂而形成连枷二尖瓣（MV）小叶是该疾病的一种已知并发症，通常会导致严重的二尖瓣反流。报道了两个病例，其中连枷前 MV 瓣叶导致严重的二尖瓣关闭不全，并导致雄性去势吉娃娃犬发生充血性心力衰竭。在不同的时间段内，重复的心脏评估揭示了左侧心脏重塑的逆转和二尖瓣反流的减轻，这使得两只狗都可以停用呋塞米。尽管罕见，但二尖瓣反流严重程度的改善可能无需手术干预，从而逆转左侧心脏重塑并停用呋塞米。