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Left ventricular function after late thrombolysis with alteplase in myocardial infarction
V M Gil1, A Ventosa, A F Antunes
1Instituto do Coração, Carnaxide.
Summary
Late thrombolysis with alteplase improved left ventricular function one month after acute myocardial infarction. This benefit on cardiac function was not sustained at six months, suggesting a potential mechanism for improved survival.
Area of Science:
- Cardiology
- Cardiovascular Research
- Pharmacology
Background:
- Late thrombolytic treatment for acute myocardial infarction (AMI) improves survival.
- Mechanisms for this benefit, particularly effects on left ventricular function, remain debated.
Purpose of the Study:
- To investigate the impact of late thrombolysis with alteplase on left ventricular function parameters in AMI patients.
- To clarify if improved left ventricular function contributes to the survival benefit of late thrombolysis.
Main Methods:
- Prospective, multicenter, randomized, double-blind study.
- 103 patients received alteplase or placebo 6-24 hours after AMI onset.
- Left ventricular function assessed by radionuclide ventriculography at 1 and 6 months.
Main Results:
- At 1 month, alteplase significantly improved left ventricular ejection fraction (48.86% vs. 43.19%, p=0.028).
- Benefits were observed in septal and apical regions at 1 month.
- No significant differences in left ventricular function were found at 6 months.
Conclusions:
- Late thrombolysis with alteplase enhances left ventricular function one month post-AMI.
- This functional improvement is transient, not persisting at six months.
- Improved left ventricular function may be a contributing mechanism to the survival benefits of late thrombolysis.