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WPW is best known for its association with supraventricular tachycardias which are usually initiated by an atrial premature complex, but can be initiated by ventricular premature complexes.
Of 28 dogs, 21 (75%) showed electrocardiographic changes (Table 1) such as sinus tachycardia, sinus arrhythmia, atrial fibrillation, 2nd degree Mobitz type B heart block, right bundle branch block, atrial premature complex, ST depression, ST elevation and complex changes as sinus arrest with LVC, sinus arrest with VPC, sinus arrest with ST elevation and LVC, VPC, broad QRS with tachycardia (Fig.
In addition, the rhythm disturbances as atrial premature complex and atrial fibrillation may be developed secondary to atrial mechanic, autonomic dysfunction and deformation.

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