The effects of changes in loading conditions and modulation of inotropic state on the myocardial performance index: comparison with conductance catheter measurements

M CHEUNG, J SMALLHORN, A REDINGTON, M VOGEL
2004 European Heart Journal  
Aim The myocardial performance index (MPI), or Tei index, has been shown to be useful in the assessment of global myocardial performance. There are few invasive data however, which examine its load dependence or sensitivity to acute changes in contractile function. The purpose of this study was therefore to study formally the effect of clinically relevant changes in these parameters in an animal model. Methods and results We examined 10 Yorkshire pigs using echocardiographic assessment and
more » ... taneous measurements of intraventricular pressure and volume by conductance catheterization. With dobutamine infusion, there was no significant change in the MPI (0.26 ± 0.13-0.22 ± 0.11; p = 0.42), but dP/dt max increased significantly (1001 ± 240-1569 ± 532 mm Hg/s, p < 0.001). Afterload increase (40% change in ventricular pressure) and preload reduction (20% change in ventricular volume) were associated with significant increases in the MPI (0.26 ± 0.13-0.49 ± 0.20; p < 0.005 and 0.26 ± 0.13-0.51 ± 0.20; p < 0.001, respectively) without any significant change in maximal elastance (Ees). Conclusions The MPI, or Tei index, is significantly affected by acute changes in loading conditions but is unable to consistently detect acute changes in contractile function.
doi:10.1016/j.ehj.2004.07.034 pmid:15589642 fatcat:qk6pemvfbjad3lwpxjcnbfsxjq