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Feasibility of Myocardial Performance Index for Evaluation of Left Ventricular Function during Dobutamine Stress Echocardiography before and after Coronary Artery Bypass Grafting
KTH, School of Technology and Health (STH), Medical Engineering, Medical Imaging.
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2014 (English)In: Echocardiography, ISSN 0742-2822, E-ISSN 1540-8175, Vol. 31, no 8, 989-995 p.Article in journal (Refereed) Published
Abstract [en]

Aims: Myocardial performance index (MPI) is a measure of combined systolic and diastolic myocardial function. In patients with coronary artery disease (CAD) an increase in MPI is consistent with myocardial dysfunction. The objectives of this study were to characterize the changes in MPI after coronary artery bypass graft (CABG) at rest and at peak dobutamine stress echocardiography (DSE). Methods and Results: Thirty-six patients diagnosed with CAD and accepted for CABG were studied by standard echocardiography and DSE 1 month prior and 3 month after CABG. The MPI was calculated using pulsed-wave tissue Doppler imaging (PW-TDI) of the left ventricular (LV) wall-motion velocity. At baseline, ejection fraction (EF; 42.7 ± 8%) and wall-motion score index (WMSI; 1.1 ± 0.2) were impaired at rest as well as at peak DSE (EF; 49.2 ± 9 and WMSI 1.4 ± 0.2). MPI was prolonged both at rest (0.61 ± 0.13) and at peak DSE (0.78 ± 0.16). After CABG, EF and WMSI did not improve at rest (43.7 ± 8% and 1.1 ± 0.2, respectively). On the other hand, MPI improved substantially both at rest (0.45 ± 0.08; P < 0.001) and at peak DSE (0.56 ± 0.1; P < 0.001). At peak DSE an improvement of EF (54.2 ± 9; P < 0.05) and WMSI (1.1 ± 0.16; P < 0.001) was seen as well. Conclusion: Myocardial performance index shows significant improvement after CABG in patients with CAD both at rest and peak DSE and appears to be a sensitive measure of myocardial function.

Place, publisher, year, edition, pages
2014. Vol. 31, no 8, 989-995 p.
Keyword [en]
Coronary artery disease, Left ventricular function, Myocardial performance index, Tissue Doppler imaging
National Category
Other Medical Sciences
URN: urn:nbn:se:kth:diva-151041DOI: 10.1111/echo.12488ISI: 000342826800024ScopusID: 2-s2.0-84908070745OAI: diva2:747176

QC 20140916

Available from: 2014-09-16 Created: 2014-09-15 Last updated: 2014-11-06Bibliographically approved

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Brodin, Lars Åke
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