title: Vectorcardiographic evaluation of myocardial infarct size: comparisons with thallium myocardial scintigraphy.
abstract: OBJECTIVE
  To determine the usefulness of vectorcardiography (VCG) in assessing myocardial infarct size.
  
  
  METHODS
  The correlation of spatial and scalar parameters of VCG with the percent defect volume (%DV) of thallium myocardial single photon emission computed tomography (SPECT) was investigated in 63 patients with first-onset myocardial infarction (MI). VCG parameters included: (1) spatial parameters: magnitude, azimuth and elevation of the maximal vector, vectors at 20 ms and 30 ms, and (2) scalar parameters: amplitudes of 20 ms and 30 ms vectors at X, Y, and Z scalar leads abbreviated as X20, Y20, Z20, X30, Y30 and Z30, respectively.
  
  
  RESULTS
  For anteroseptal MI, the azimuth of 30 ms vector and Z20 showed a significant correlation with %DV (r = 0.572, P < 0.05 and r = 0.832, P < 0.001) while in anteroseptal MI with involvement of lateral wall, the azimuth of 30 ms vector and X30 were correlated with %DV significantly (r = 0.775, and r = 0.780, P < 0.01). For inferior and inferoposterior MI, the elevation of 30 ms vector and Y30 were correlated well with %DV (r = 0.871, P < 0.01, r = 0.928, P < 0.001 for inferior MI and r = 0.678, P < 0.01, r = 0.760, P < 0.001 for inferoposterior MI).
  
  
  CONCLUSIONS
  VCG parameters, especially scalar parameters, can be used to evaluate myocardial infarct size easily and non-invasively with remarkable accuracy.
authors.affiliation: Department of Functional Examination, Second Hospital of Hebei Medical University, Shijiazhuang 050000, China. jwang@public.sj.he.cn
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: T
authors.initials: T
authors.lastname: Kondo
authors.forename: M
authors.initials: M
authors.lastname: Tokuda
authors.forename: H
authors.initials: H
authors.lastname: Shinozaki
authors.forename: M
authors.initials: M
authors.lastname: Sarai
authors.forename: T
authors.initials: T
authors.lastname: Yasui
authors.forename: J
authors.initials: J
authors.lastname: Ishii
authors.forename: H
authors.initials: H
authors.lastname: Kurokawa
authors.forename: M
authors.initials: M
authors.lastname: Nomura
authors.forename: H
authors.initials: H
authors.lastname: Hishida
authors.forename: Y
authors.initials: Y
authors.lastname: Watanabe
mesh_terms: D000368:Aged; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis / Q000473:pathology*; D013794:Thallium Radioisotopes; D015899:Tomography, Emission-Computed, Single-Photon; D014672:Vectorcardiography
chemical_list: D013794:Thallium Radioisotopes