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Electrophysiological characteristics and outcome in patients with idiopathic right ventricular arrhythmia compared with arrhythmogenic right ventricular dysplasia

¹ Institute of Cardiology, University of Milan, IRCCS, Fondazione "I Monzino", Milan, Italy
² Department of Cardiology, University of Heidelberg, Heidelberg, Germany

Correspondence to:
Correspondence to:
Dr Paolo Della Bella, Institute of Cardiology, University of Milan, Centro Cardiologico – IRCCS, Via Parea 4, 20138 Milan, Italy

Background: Idiopathic right ventricular arrhythmias (IRVA) are responsive to medical and ablative treatment and have a benign prognosis. Arrhythmias caused by right ventricular dysplasia (ARVD) are refractory to treatment and may cause sudden death. It is difficult to distinguish between these two types of arrhythmia.

Objective: To differentiate patients with IRVA and ARVD by a conventional electrophysiological study.

Methods: 56 patients with a right ventricular arrhythmia were studied. They had no history or signs of any cardiac disease other than right ventricular dysplasia. They were classified as having IRVA (n = 41) or ARVD (n = 15) on the basis of family history, ECG characteristics, and various imaging techniques. They were further investigated by standard diagnostic electrophysiology.

Results: The two groups were clearly distinguished by the electrophysiological study in the following ways: inducibility of ventricular tachycardia by programmed electrical stimulation with ventricular extrastimuli (IRVA 3% v ARVD 93%, p < 0.0001); presence of more than one ECG morphology during tachycardia (IRVA 0% v ARVD 73%, p < 0.0001); and fragmented diastolic potentials during ventricular arrhythmia (IRVA 0% v ARVD 93%, p < 0.0001). Data from the clinical follow up in these patients supported the diagnosis derived from the electrophysiological study.

Conclusions: Patients with IRVA or ARVD can be distinguished by specific electrophysiological criteria. A diagnosis of ARVD can be made reliably on the basis of clinical presentation, imaging techniques, and an electrophysiological study.

Keywords: arrhythmia; right ventricular dysplasia; catheter ablation

Abbreviations: ARVD, arrhythmogenic right ventricular dysplasia; IRVA, idiopathic right ventricular arrhythmia; LBBB, left bundle branch block; MRI, magnetic resonance imaging; RBBB, right bundle branch block; RFCA, radiofrequency catheter ablation; VT ventricular tachycardia

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