Related Experiment Videos
Effects of intracoronary thrombolysis therapy on left ventricular function after acute myocardial infarction
Insights
Intracoronary thrombolysis with urokinase within 6 hours improved myocardial infarction recovery. Early reperfusion preserved left ventricular function, while delayed or no reperfusion led to deterioration.
Area of Science:
- Cardiology
- Interventional Cardiology
Background:
- Myocardial infarction (MI) poses significant risks to left ventricular (LV) function.
- Conventional therapies may not fully restore cardiac function post-MI.
Purpose of the Study:
- To evaluate the efficacy of intracoronary thrombolysis with nitroglycerin and urokinase in preserving LV function after acute myocardial infarction.
- To compare outcomes between early reperfusion and no reperfusion groups.
Main Methods:
- Direct injection of nitroglycerin and urokinase into the infarct-related coronary artery during acute MI.
- Assessment of left ventricular ejection fraction (LVEF), regional ejection changes, and left ventricular end-diastolic pressure (LVEDP) in acute and chronic phases.
- Comparison with conventional therapy and stratification by reperfusion status.
Main Results:
- Intracoronary thrombolysis significantly preserved LVEF and regional ejection changes compared to conventional therapy.
- Patients with reperfusion within 6 hours showed significant improvements in LVEF, regional ejection, and LVEDP.
- No reperfusion resulted in LV ejection fraction deterioration, and reocclusion led to worse chronic-phase LVEF.
Conclusions:
- Intracoronary thrombolysis with urokinase within 6 hours is a promising treatment for myocardial infarction.
- Early reperfusion is critical for recovery of myocardial damage and preservation of LV function.
- Timely intervention can mitigate long-term adverse effects on cardiac function post-MI.
Abstract:
To treat the acute phase of myocardial infarction, nitroglycerin and urokinase were injected directly into the infarct-related coronary artery. Left ventricular ejection fraction and regional ejection changes were significantly preserved in the chronic phase, compared with conventional therapy in patients with obstruction at the same site. Comparing left ventricular function in the acute and chronic phases, left ventricular ejection fraction, regional ejection changes and left ventricular end-diastolic pressure were significantly improved in the chronic phase in patients with reperfusion within 6 hours. On the other hand, in patients who had no reperfusion in either the acute or chronic phase, left ventricular ejection fraction deteriorated in the chronic phase. Even in patients with reperfusion in the acute phase, reocclusion later meant a worse left ventricular ejection fraction in the chronic phase. These results suggest that intracoronary thrombolysis with urokinase within 6 hours gives a good chance of recovery from myocardial damage in patients with myocardial infarction.