title: Differences between cardiac memory T wave changes after idiopathic left ventricular tachycardia and ischemic T wave inversion induced by acute coronary syndrome.
abstract: Cardiac memory (CM) after idiopathic left ventricular tachycardia (ILVT) mimics ischemic T wave inversion (TWI) induced by acute coronary syndrome (ACS). We aimed to establish electrocardiography criteria for differentiating the CM from ischemic TWI.
  
  
  
  We evaluated 16 ILVT and 48 ACS patients. We identified TWI after ILVT in 9/16 patients (CM group), typically in leads II, III, aVF, aVR, and V4-6. The characteristics of CM were similar to TWI induced by ACS involving right coronary artery, but the CM group had more TWI in V4 and shorter QTc. The criteria of (1) positive T in aVL, (2) negative or isoelectric T in II, and (3) negative T in V4-6 or (4) QTc <430ms were 100% sensitive and 96% specific for the CM group.
  
  
  
  CM after ILVT can be differentiated in most cases from ischemic TWI by the distribution of TWI and the QTc.
authors.affiliation: Division of Cardiology, Sendai City Hospital, Sendai, Japan; Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan. Electronic address: nakadi31415@yahoo.co.jp.
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakagawa
authors.affiliation: Division of Cardiology, Sendai City Hospital, Sendai, Japan.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Yagi
authors.affiliation: Division of Cardiology, Sendai City Hospital, Sendai, Japan.
authors.forename: Akihiko
authors.initials: A
authors.lastname: Ishida
authors.affiliation: Division of Cardiology, Sendai City Hospital, Sendai, Japan.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Mibiki
authors.affiliation: Division of Cardiology, Sendai City Hospital, Sendai, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Yamashina
authors.affiliation: Division of Cardiology, Sendai City Hospital, Sendai, Japan.
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Sato
authors.affiliation: Division of Cardiology, Sendai City Hospital, Sendai, Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Sato
authors.affiliation: Division of Cardiology, Sendai City Hospital, Sendai, Japan.
authors.forename: Juri
authors.initials: J
authors.lastname: Komatsu
authors.affiliation: Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan.
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Saijo
mesh_terms: D054058:Acute Coronary Syndrome / Q000150:complications / Q000175:diagnosis*; D000328:Adult; D000465:Algorithms; D003937:Diagnosis, Differential; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D017202:Myocardial Ischemia / Q000175:diagnosis* / Q000209:etiology; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D017180:Tachycardia, Ventricular / Q000175:diagnosis* / Q000209:etiology; D018487:Ventricular Dysfunction, Left / Q000175:diagnosis* / Q000209:etiology
keywords: Cardiac memory; Idiopathic left ventricular tachycardia; Ischemic T wave; T wave axis; T wave inversion