Daily serial evaluation of left ventricular function with equilibrium radionuclide ventriculography following thrombolysis during acute myocardial infarction
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J D Marx1, A van Aswegen, P H Kleynhans
1Department of Cardiology, University of the Orange Free State, Bloemfontein, South Africa.
Insights
Successful reperfusion significantly improves left ventricular function within 72 hours after acute myocardial infarction. This enhanced cardiac function is maintained for 10 days, aiding treatment decisions.
Area of Science:
- Cardiology
- Cardiovascular Physiology
- Interventional Cardiology
Background:
- Assessing left ventricular function post-reperfusion is crucial for guiding long-term treatment after acute myocardial infarction.
- Coronary thrombolysis is a key intervention for restoring blood flow in myocardial infarction.
Purpose of the Study:
- To evaluate early changes in left ventricular function following coronary reperfusion therapy.
- To compare ventricular function in patients with successful versus unsuccessful reperfusion.
Main Methods:
- Serial evaluation of left ventricular function over 10 days in 18 patients.
- Intracoronary thrombolytic therapy administered for acute myocardial infarction.
- Comparison of global and regional ventricular function between reperfusion groups.
Main Results:
- Successfully reperfused patients demonstrated significantly better global ventricular function from day 1 onwards compared to unsuccessfully reperfused patients.
- Global and regional ventricular function improved significantly within 72 hours in the successful group, with sustained improvement over 10 days.
- Unsuccessful reperfusion led to no change in regional function and a decline in global function between days 5 and 8.
Conclusions:
- Successful reperfusion therapy significantly improves left ventricular function after acute myocardial infarction.
- The most substantial functional improvements occur within the initial 72 hours post-reperfusion.
- Findings in human patients align with previous experimental animal studies on ventricular function recovery.
Abstract:
The changes in ventricular function after reperfusion by coronary thrombolysis are important when deciding about further definitive treatment necessary to ensure long-term vessel patency. The purpose of this study was to evaluate the early changes in left ventricular function after reperfusion. Left ventricular function was serially evaluated for 10 days in a group of 18 patients receiving intracoronary thrombolytic therapy for an acute myocardial infarction. Comparison of the global ventricular function in the successfully and unsuccessfully reperfused groups of patients showed significantly better function in the successful group than the unsuccessful group after the first day, which was maintained for the entire study period. Global and regional ventricular function in the successfully reperfused patients showed significant early improvement during the initial 72 h with maintenance of this improvement for the study period of 10 days. In the patients in whom reperfusion was unsuccessful, regional ventricular function showed no change, while the global function declined from day 5 to day 8 of the study period. This study then confirms the significant improvement in ventricular function after successful reperfusion. The time course pattern of the change in ventricular function indicates that the most significant improvement occurs within the first 72 h after reperfusion. These changes are similar to those previously reported in experimental animals.