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Analysis of the left ventricular early diastolic function in old myocardial infarction by gated radionuclide
Insights
Left ventricular diastolic function, assessed by radionuclide angiography, more accurately reflects cardiac damage after myocardial infarction (MI) than systolic function. Diastolic dysfunction is more pronounced and essential for evaluating MI severity and treatment efficacy.
Area of Science:
- Cardiology
- Nuclear Cardiology
- Cardiac Imaging
Background:
- Ischemic heart disease, particularly myocardial infarction (MI), significantly impacts left ventricular (LV) function.
- Assessing LV systolic function, such as LV ejection fraction (LVEF), is standard, but its adequacy in evaluating post-MI changes is questioned.
Purpose of the Study:
- To evaluate the validity of assessing LV diastolic function for the diagnosis and management of ischemic heart disease post-MI.
- To compare the sensitivity of diastolic function parameters versus systolic function (LVEF) in detecting LV dysfunction after MI.
Main Methods:
- Gated radionuclide angiography was performed in 37 patients with transmural MI (anterior and inferior) and 10 normal controls.
- Key diastolic parameters including time to peak filling rate, filling fraction, and peak filling rate (PFR) were analyzed.
- LV ejection fraction (LVEF) was also measured for comparison.
Main Results:
- LVEF was reduced in anterior MI but not significantly in inferior MI.
- Peak filling rate (PFR) was significantly reduced in both anterior and inferior MI.
- Normal PFR consistently indicated normal LVEF, but normal LVEF did not always indicate normal PFR.
Conclusions:
- LV diastolic function, assessed via radionuclide angiography, may be a more precise indicator of LV dysfunction in old MI than LV systolic function.
- Diastolic dysfunction is often more prominent than systolic dysfunction following MI.
- Evaluating LV diastolic function is crucial for estimating ischemic myocardial damage and the effectiveness of therapies for ischemia-induced LV dysfunction.
Abstract:
In order to determine the validity of the left ventricular (LV) diastolic function for evaluation of ischemic heart disease, gated radionuclide angiography was performed in 37 patients with transmural myocardial infarction (MI) [18: anterior, 19: inferior infarction] and 10 normal control subjects. LV ejection fraction (LVEF) was decreased in patients with anterior MI but not in those with inferior MI. Time to peak filling rate was not significantly prolonged in both anterior MI and inferior MI. Filling fraction was apparently reduced only in anterior MI. However, peak filling rate (PFR) was significantly reduced even in inferior MI as well as in anterior MI. PFR correlated well with LVEF in normal control, anterior MI and inferior MI. In both anterior MI and inferior MI, their coefficients were smaller than in controls. The normal PFR always indicated normal LVEF, while normal LVEF was not necessarily indicative of normal PFR. Results indicated that LV diastolic function estimated by equilibrium radionuclide angiography might reflect more precisely LV dysfunction in old MI than LV systolic function. The reduction of LV diastolic function in old MI was more prominent than that of LV systolic function. Therefore, it may be deduced that evaluation of LV diastolic function is essential to the estimation of the degree of ischemic myocardial cell damage and the efficacy of drugs on ischemia-induced LV dysfunction.