Disagreement between tissue Doppler imaging and conventional pulsed wave Doppler in the measurement of myocardial performance index.
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.
Rojo
Eduardo Casas
EC
Hospital Clínico San Carlos, Instituto Cardiovascular, C/Professor Martín Lagos s/n, 28040 Madrid, Spain. ecasasweb@jazzfree.com
Rodrigo
José Luis
JL
Pérez de Isla
Leopoldo
L
Almería
Carlos
C
Gonzalo
Nieves
N
Aubele
Adalía
A
Cinza
Rafael
R
Zamorano
José
J
Macaya
Carlos
C
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