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Section: Information In-depth
Both atrial fibrillation (AF) and the related rhythm, atrial flutter, originate in the top chambers of the heart called the atria. Both rhythms can lead to a decrease in heart function related to chaotic rhythm and excessively rapid heart rates. These electrical disturbances can rarely be "cured" back to normal because the majority of dogs with AF have progressive underlying heart disease. When AF occurs as the only heart problem (lone atrial fibrillation) or suddenly develops in a hospitalized patient, there is a greater likelihood that the rhythm can be made "normal" again. However, over 95 percent of cases maintain AF for life. A number of other heart rhythm disturbances can also lead to a rapid heart rate and deterioration in heart function. Ventricular tachycardia is a good example; this is a rapid heart rate that originates in the lower chambers of the heart called the ventricles.
Valvular heart disease (VHD) is a condition characterized by degeneration and thickening of the heart valves. It is a progressive disease more common in dogs than cats that can cause valve malfunction...
Hypertrophic cardiomyopathy (HCM) is a condition characterized by thickening of the main pumping chamber of the heart. Eventually, HCM often leads to congestive heart failure.
Heart failure is a condition, caused by an abnormality in the structure or the function of the heart, in which it is unable to pump normal quantities of blood to the tissues of the body.
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