Supraventriculaire tachycardie met isoritmische atrioventriculaire dissociatie bij een labrador-retriever

A neutered, seven-year-old, female Labrador retriever was presented with complaints of tachypnea, gagging and abdominal distension. A left apical systolic murmur with an intensity of 3/6, tachycardia, weak femoral pulses and positive undulation were observed on physical examination. After echocar-diographic and electrocardiographic examination, dilated cardiomyopathy (primary or secundary) and supraventricular tachycardia were diagnosed. At a later control visit, after initiation of treatment with digoxin, electrocardiography revealed isorhythmic atrioventricular dissociation (IAVD) and poor control of the SVT. After transition to diltiazem, the tachycardia was well-controlled. A full recovery of the heart was observed on echocardiographic examination. Twenty-four months later, the dog showed no more cardiac signs. In this case report, a rare arrhythmia, i.e. IAVD in combination with SVT is described. It shows the importance of SVT as a reversible cause of a DCM-like phenotype on echo-cardiography