QRST‐Wave Alternans in a Child with Type 3 Long‐QT Syndrome: An Ominous ECG Pattern Appearing During Transition from T‐Wave Alternans to Polymorphic VT

QRST-Wave Alternans in a Child with Type 3 Long-QT Syndrome: An Ominous ECG Pattern Appearing During Transition from T-Wave Alternans to Polymorphic VT HIROKO GOTO, M.D.,∗ NOBUHIRO TAKASUGI, M.D.,† TAKASHI KUWAHARA, M.D.,∗ and RICHARD L. VERRIER, Ph.D.‡ From the ∗Department of Pediatrics, Gifu Prefectural General Medical Center, Gifu, Japan; †Division of Cardiovascular, Medicine, Gifu University Hospital, Gifu, Japan; and ‡Cardiovascular Medicine Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA