View an annotated image of Hunter’s ECG highlighting the relevant findings. Relevant Findings: There are only 2 normal sinus beats on this strip (blue arrows) with normal P-QRS-T wave morphology. The other QRS complexes in this strip (red arrows) are wide and bizarre, and are not preceded by a P-wave. This combination of findings suggests that the impulses are ventricular in origin, and do not represent normal sinus beats. There are unrelated P-waves “moving across” the ventricular complexes and not related to the ventricular rhythm, indicating AV dissociation (black arrow). The ventricular rate is faster than what is identified with typical ventricular escape rhythms (135-170bpm), but somewhat slower than would be expected for a true ventricular tachycardia in the dog (although different cardiologists use different heart rate cut-offs for this designation). If the heart rate is within physiological limits, some use the term ‘slow’ V-tach to describe this rhythm, but accelerated idioventricular rhythm (AIVR) is usually preferred.