title: Evaluation of Tissue Doppler Tei index for global left ventricular function in mice after myocardial infarction: comparison with Pulsed Doppler Tei index.
abstract: OBJECTIVE
  The Pulsed Doppler Tei index is a parameter to evaluate combined systolic and diastolic function in humans. However, one major limitation is that the parameters of Pulsed Doppler Tei index cannot be measured within one cardiac cycle. Therefore, accuracy of the Pulsed Doppler Tei index may be affected by anesthesia induced heart rate variation in mice echocardiography. Tissue Doppler Imaging (TDI) enables us to measure both relaxation and contraction velocities simultaneously. Thus, the aim of our study was to validate TDI and Pulsed Doppler Tei index and their reproducibility in mice after experimental anterior myocardial infarction (MI).
  
  
  RESULTS
  Pulsed Doppler Tei index and TDI Tei index were assessed before and 4 weeks after MI. Both parameters increased significantly after MI (Pulsed Doppler: 0.4+/-0.04 to 0.7+/-0.03; P<0.001; TDI: 0.2+/-0.03 to 0.5+/-0.04; P<0.0001). In addition, TDI Tei index showed a good correlation with ejection fraction and fractional shortening, and was indicated by better reproducibility than Pulsed Doppler Tei index.
  
  
  CONCLUSIONS
  Tissue Doppler Tei index is appropriate to characterize global left ventricular function in mice after MI.
authors.affiliation: Department of Cardiology and Angiology, Medical School Hannover, Carl-Neuberg-Str. 1, 30625 Hannover, Germany. schaefer.arnd@mh-hannover.de
authors.forename: Arnd
authors.initials: A
authors.lastname: Schaefer
authors.forename: Gerd Peter
authors.initials: GP
authors.lastname: Meyer
authors.forename: Denise
authors.initials: D
authors.lastname: Hilfiker-Kleiner
authors.forename: Birgit
authors.initials: B
authors.lastname: Brand
authors.forename: Helmut
authors.initials: H
authors.lastname: Drexler
authors.forename: Gunnar
authors.initials: G
authors.lastname: Klein
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D015150:Echocardiography, Doppler; D018619:Echocardiography, Doppler, Pulsed; D006339:Heart Rate; D017379:Hypertrophy, Left Ventricular / Q000000981:diagnostic imaging / Q000503:physiopathology; D051379:Mice; D008810:Mice, Inbred C57BL; D009203:Myocardial Infarction / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D013318:Stroke Volume; D016277:Ventricular Function, Left