title: EASI-Derived vs standard 12-lead electrocardiogram for Selvester QRS score estimations of chronic myocardial infarct size, using cardiac magnetic resonance imaging as gold standard.
abstract: BACKGROUND
  The size of myocardial infarction (MI) is of significance for the prognosis. Selvester scores might be valuable for this estimation.
  
  
  OBJECTIVE
  To compare the differences in Selvester scores for chronic MI provided from standard and EASI-derived 12-lead electrocardiograms (ECGs) and to compare these scores to the MI size measured by delayed-enhancement magnetic resonance imaging (DE-MRI).
  
  
  METHODS
  Thirty-seven patients were studied. In connection with their DE-MRI scan follow-up after chest pain, body surface potential mapping was performed. Standard and EASI 12-lead ECGs were constructed from the maps. Two investigators manually performed the measurements required for scoring with the Selvester system using a quad-plot format of the ECGs. One of the investigators repeated this once for the standard leads.
  
  
  RESULTS
  The differences between the 2 ECG estimations of MRI-measured MI size were not statistically significant. Neither the association nor the agreement between MRI and EASI-lead measurements or between MRI and standard-lead measurements were very strong.
  
  
  CONCLUSIONS
  The differences between ECG and MRI measurements of MI size indicate that both methods may need improvement.
authors.affiliation: Department of Clinical Physiology, University Hospital, Lund, Sweden. annika.welinder@med.lu.se
authors.forename: Annika E
authors.initials: AE
authors.lastname: Welinder
authors.forename: Galen S
authors.initials: GS
authors.lastname: Wagner
authors.forename: B Milan
authors.initials: BM
authors.lastname: Horácek
authors.forename: Thomas N
authors.initials: TN
authors.lastname: Martin
authors.forename: Charles
authors.initials: C
authors.lastname: Maynard
authors.forename: Olle
authors.initials: O
authors.lastname: Pahlm
mesh_terms: D004562:Electrocardiography / Q000379:methods* / Q000592:standards; D005260:Female; D006801:Humans; D038622:Internationality; D008279:Magnetic Resonance Imaging / Q000379:methods* / Q000592:standards; D008297:Male; D009203:Myocardial Infarction / Q000175:diagnosis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index