Madias, John E T wave alternans detected in defibrillator electrograms. [electronic resource] - Circulation journal : official journal of the Japanese Circulation Society Mar 2009 - 593; author reply 594 p. digital Publication Type: Comment; Letter ISSN: 1346-9843 Standard No.: 10.1253/circj.cj-08-1124 doi Subjects--Topical Terms: Defibrillators, ImplantableElectrocardiographyHumansTachycardia, Ventricular--diagnosis