title: Disagreement between tissue Doppler imaging and conventional pulsed wave Doppler in the measurement of myocardial performance index.
abstract: OBJECTIVE
  Myocardial performance index (MPI) is usually measured with pulsed wave Doppler (PWD). Our aim was to assess the degree of agreement between PWD and a method based on tissue Doppler imaging (TDI).
  
  
  RESULTS
  Seventy-five patients with prior myocardial infarction and 20 healthy subjects underwent measurement of time intervals and MPI with PWD and pulsed TDI at septal and lateral sides of mitral annulus. MPI and TDI-MPI at septal side showed the best intraclass correlation coefficient (ICC=0.54; p<0.0005). Ninety-five percent interval of agreement ranged from -0.27 to 0.22. These differences were attributed to discrepancies in isovolumic contraction and relaxation times. In the healthy group the results were similar (ICC=0.44), although the 95% interval of agreement was lower (from -0.13 to 0.12).
  
  
  CONCLUSIONS
  The agreement between PWD and TDI in the measurement of MPI is only moderate. This should be taken into account in the interpretation of studies in which TDI is used for this measurement.
authors.affiliation: Hospital Clínico San Carlos, Instituto Cardiovascular, C/Professor Martín Lagos s/n, 28040 Madrid, Spain. ecasasweb@jazzfree.com
authors.forename: Eduardo Casas
authors.initials: EC
authors.lastname: Rojo
authors.forename: José Luis
authors.initials: JL
authors.lastname: Rodrigo
authors.forename: Leopoldo
authors.initials: L
authors.lastname: Pérez de Isla
authors.forename: Carlos
authors.initials: C
authors.lastname: Almería
authors.forename: Nieves
authors.initials: N
authors.lastname: Gonzalo
authors.forename: Adalía
authors.initials: A
authors.lastname: Aubele
authors.forename: Rafael
authors.initials: R
authors.lastname: Cinza
authors.forename: José
authors.initials: J
authors.lastname: Zamorano
authors.forename: Carlos
authors.initials: C
authors.lastname: Macaya
mesh_terms: D000368:Aged; D001783:Blood Flow Velocity; D001794:Blood Pressure; D015150:Echocardiography, Doppler; D018619:Echocardiography, Doppler, Pulsed; D005260:Female; D006339:Heart Rate; D006352:Heart Ventricles / Q000000981:diagnostic imaging / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction; D009203:Myocardial Infarction / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D015588:Observer Variation; D013318:Stroke Volume