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→Electrocardiography
===Electrocardiography===
===Electrocardiography===
The ECG of infected dogs is usually normal. Right ventricular hypertrophy patterns are seen when there is severe, chronic pulmonary hypertension and are associated with overt or impending right-sided CHF (ascites). Heart rhythm disturbances are usually absent or mild, but atrial fibrillation is an occasional complication in dogs with Class III disease.
The ECG of infected dogs is usually normal. Right ventricular hypertrophy patterns may be seen in chronic ,severe pulmonary hypertension and are associated with impending or apparent right-sided congestive heart failure<sup>4</sup>. Arrhythmias do not normally occur, buy atrial fibrillation is is occasionall seen in Class III disease.
Electrocardiography is less useful in the cat, as involvement of the heart chambers does not occur as frequently as in the dog<sup>5</sup>.
===Laboratory Tests===
===Laboratory Tests===