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- Lethargy
- Slowed heart rate
- Syncope (fainting)
- Abdominal distention
- Cough
- Cyanosis (blue tinge to skin and mucous membranes)
- Difficulty breathing
- Muscle wasting, especially of the forelegs and shoulders
- The most common cause of temporary atrial standstill is a lower than usual amount of circulating potassium in the blood (hyperkalemia)
- The inflammatory heart disease myocarditis is another possible cause of temporary atrial standstill
- Persistent atrial standstill can be caused by a physical defect to the heart, as seen in atrioventricular muscle dystrophy, cardiomyopathy, and double-chambered right ventricle
- It can also have a peripheral cause such as hypothyroidism, hypoadrenocorticism, and immune-mediated polymyositis
- Congestive heart failure with atrial standstill involved would be considered a terminal atrial standstill
- Addison’s disease (hypoadrenocorticism)
- Atrial myopathy
- Atrioventricular muscle dystrophy
- Cardiomyopathy
- Double-chambered right ventricle
- Drug intoxication
- Electrolyte abnormalities
- Genetic predisposition (English Springer Spaniel, German Shorthaired Pointer, Old English Sheepdog, Shih Tzu)
- Hyperkalemia
- Hypothyroidism
- Immune-mediated polymyositis
- Myocarditis
- Oliguric renal failure
- Urethral obstruction
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