Prevalence and prognostic role of L wave and selected clinical and echocardiographic variables in dogs with atrial fibrillation.

Background: Information regarding the frequency of L waves and their prognostic relevance in dogs with secondary atrial fibrillation (AF) is limited.

Hypothesis/objectives: To determine whether L waves occur and ascertain their prognostic role, as well as the role of other clinical and echocardiographic variables in dogs with AF.

Animals: Fifty-five dogs with AF associated with myxomatous mitral valve disease or dilated cardiomyopathy.