Most animals have no clinical signs from the sinus bradycardia but have signs of their underlying disease Occasionally dogs show weakness, exercise intolerance, or fainting Cats may be quieter than usual Some animals have signs of heart disease, such as lethargy, decreased appetite, increased breathing rate and effort, or coughing On physical examination, the animal's heartApr 27, 21 · First, the doctor needs to examine an electrocardiogram (ECG) while the bradycardia is present to determine whether it is due to sinus bradycardia or heart block Then, the doctor must determine whether the bradycardia is likely to be persistent or due to aCommon auscultatory findings in animals with an arrhythmia are a rate that is too slow (bradycardia), a rate that is too fast (tachycardia), premature beats (a beat is heard too early), an irregular rhythm, and pauses in the rhythm Whenever an abnormal rhythm is Atrioventricular Block Cardiovascular Disorders Merck Manuals Professional Edition What...