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• W2068704210 abstract "The rodent model of myocardial infarction (MI) is extensively used in heart failure studies. However, long-term follow-up of echocardiographic left ventricular (LV) function parameters such as the myocardial performance index (MPI) and its ratio with the fractional shortening (LVFS/MPI) has not been validated in conjunction with invasive indexes, such as those derived from the conductance catheter (CC). Sprague-Dawley rats with left anterior descending coronary artery ligation (MI group, n = 9) were compared with a sham-operated control group ( n = 10) without MI. Transthoracic echocardiography (TTE) was performed every 2 wk over an 8-wk period, after which classic TTE parameters, especially MPI and LVFS/MPI, were compared with invasive indexes obtained by using a CC. Serial TTE data showed significant alterations in the majority of the noninvasive functional and structural parameters (classic and novel) studied in the presence of MI. Both MPI and LVFS/MPI significantly ( P < 0.05 for all reported values) correlated with body weight ( r = −0.58 and 0.76 for MPI and LVFS/MPI, respectively), preload recruitable stroke work ( r = −0.61 and 0.63), LV end-diastolic pressure (LVEDP) ( r = 0.82 and −0.80), end-diastolic volume ( r = 0.61 and −0.58), and end-systolic volume ( r = 0.46 and −0.48). Forward stepwise linear regression analysis revealed that, of all variables tested, LVEDP was the only independent determinant of MPI ( r = 0.84) and LVFS/MPI ( r = 0.83). We conclude that MPI and LVFS/MPI correlate strongly and better than the classic noninvasive TTE parameters with established, invasively assessed indexes of contractility, preload, and volumetry. These findings support the use of these two new noninvasive indexes for long-term analysis of the post-MI LV remodeling." @default.
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• W2068704210 date "2006-04-01" @default.
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• W2068704210 title "Noninvasive Doppler-derived myocardial performance index in rats with myocardial infarction: validation and correlation by conductance catheter" @default.
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• W2068704210 doi "https://doi.org/10.1152/ajpheart.00935.2005" @default.
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