Copyright © 2005, The European Society of Cardiology
Disagreement between tissue Doppler imaging and conventional pulsed wave Doppler in the measurement of myocardial performance index
Hospital Clínico San Carlos, Instituto Cardiovascular, C/Professor Martín Lagos s/n, 28040 Madrid, Spain
Received 27 April 2005; received in revised form 8 August 2005; accepted after revision 19 August 2005.
* Corresponding author. Tel.: +34 91 669286904; fax: +34 91 3303293. ecasasweb{at}jazzfree.com
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Abstract |
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Aim 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).
Methods and 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.
Keywords: Tissue Doppler imaging; Echocardiography; Tei index; Myocardial performance index