Referenced in: none

Automatically associated channels: Kv11.1 , Kv7.1

Title: Benign premature ventricular complexes from the right ventricular outflow tract triggered polymorphic ventricular tachycardia in a latent type 2 LQTS patient.

Authors: Akinori Sato, Masaomi Chinushi, Keiko Sonoda, Akira Abe, Daisuke Izumi, Hiroshi Furushima

Journal, date & volume: Intern. Med., 2012 , 51, 3261-5

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/23207121

Abstract
A 57-year-old woman showed frequent premature ventricular complexes (PVCs) originating from the right ventricular outflow tract (RVOT), and some of the PVCs triggered polymorphic ventricular tachycardia (PVT). Structural heart diseases were ruled out by conventional cardiac examinations. Radiofrequency catheter ablation was successful in eliminating the PVCs and subsequent PVT. However, epinephrine infusion unmasked her prolonged QT interval, and a genetic analysis revealed a KCNH2 mutation (R694H) as the cause of latent type-2 long QT syndrome (LQTS). This case suggests that latent LQTS may work as an arrhythmogenic substrate of PVT triggered by a benign form of RVOT-PVCs in patients with a structurally normal heart.