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* Mid-systolic click, associated with mitral prolapse. In many dogs, clicks are a precursor to mitral regurgitation.
 
* Mid-systolic click, associated with mitral prolapse. In many dogs, clicks are a precursor to mitral regurgitation.
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Other findings will depend on the stage of disease. Crackles may be detected on thoracic auscultation in patients with pulmonary oedema. Abdominal palpation is usually normal, but ascites and hepatomegaly may be present when there is concurrent right-sided congestive heart failure.  
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Other findings will depend on the stage of disease. Crackles may be detected on thoracic auscultation in patients with pulmonary oedema, resulting from [[Heart Failure, Left-Sided|left-sided congestive heart failure]]. Abdominal palpation is usually normal, but ascites and hepatomegaly may be present when there is concurrent [[Heart Failure, Right-Sided|right-sided congestive heart failure]].  
    
Primary respiratory disease, such as chronic bronchitis, is also common in older small breed dogs. It is important to distinguish between the patient with clinically significant respiratory disease and incidental DMVD from the patient with clinically significant DMVD. Respiratory sinus arrhythmia, indicating vagal influence on heart rate and rhythm, is usually not present in severe cardiac disease. In contrast, sinus arrhythmia is usually preserved or accentuated when respiratory disease is the cause of clinical signs.
 
Primary respiratory disease, such as chronic bronchitis, is also common in older small breed dogs. It is important to distinguish between the patient with clinically significant respiratory disease and incidental DMVD from the patient with clinically significant DMVD. Respiratory sinus arrhythmia, indicating vagal influence on heart rate and rhythm, is usually not present in severe cardiac disease. In contrast, sinus arrhythmia is usually preserved or accentuated when respiratory disease is the cause of clinical signs.
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