A 13-year-old Italian American boy complained of perceived episodes of rapid heart rate, which began during or immediately following exercise and subsided at rest. During these periods, he also experienced shortness of breath, diaphoresis, and dizziness without syncope. A grandfather died suddenly at the age of 40 years of unknown causes and a grandmother requires a pacemaker. The patient weighed 91 kg and his heart rate was 84 beats/min; a 12-lead electrocardiogram showed normal sinus rhythm with normal atrial and ventricular forces. An echocardiogram showed normal cardiac anatomy without any ventricular dyskinetic areas. Ventricular tachycardia was mapped by pace mapping and its origin was traced to the right ventricular outflow tract. The patient was given an event monitor (Figure 1). A right ventricular endomyocardial biopsy was performed (Figure 2).
Diagnosis and Discussion
Arrhythmogenic Right Ventricular Dysplasia
Right ventricular dysplasia is an idiopathic cardiomyopathy1 characterized pathologically by fatty infiltration
Arnold SR, McCormack J, Gilbert-Barness E. Pathological Case of the Month. Arch Pediatr Adolesc Med. 1997;151(7):743–744. doi:10.1001/archpedi.1997.02170440105020
Browse and subscribe to JAMA Network podcasts!
Customize your JAMA Network experience by selecting one or more topics from the list below.
Create a personal account or sign in to: