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Updated: Aug 8, 2026

Prehospital Thrombolysis: A Manual from Berlin
Published on: November 26, 2013
Objectives of thrombolytic therapy in acute myocardial infarction
Insights
Thrombolytic therapy using urokinase and streptokinase aims to restore blood flow in acute myocardial infarction. These agents dissolve clots, reduce heart muscle damage, and prevent further thrombus formation, aiding in recovery.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Acute myocardial infarction (AMI) requires prompt restoration of coronary artery patency.
- Thrombolytic therapy is a cornerstone treatment for AMI.
- Urokinase and streptokinase are widely used thrombolytic agents.
Purpose of the Study:
- To outline the objectives of thrombolytic therapy in AMI.
- To discuss the mechanisms and advantages of urokinase and streptokinase.
- To review methods for assessing treatment efficacy.
Main Methods:
- Review of thrombolytic agents (urokinase, streptokinase) and their mechanisms.
- Discussion of invasive (angiography) and noninvasive assessment techniques for coronary reperfusion.
- Overview of methods for evaluating myocardial salvage and infarct size.
Main Results:
- Urokinase and streptokinase dissolve thrombi by activating plasminogen to plasmin.
- Systemic fibrinolytic effects of these agents may reduce blood viscosity and prevent new thrombi.
- Noninvasive reperfusion criteria include ST-segment changes, CK-MB curves, and arrhythmias.
Conclusions:
- Thrombolytic therapy aims to restore patency, salvage myocardium, and reduce infarct size in AMI.
- Assessment of reperfusion and myocardial salvage utilizes various invasive and noninvasive techniques.
- Ongoing research investigates coronary artery repair timing post-thrombolysis.
Abstract:
The objectives of thrombolytic therapy in acute myocardial infarction are to restore coronary artery patency, salvage myocardium, reduce infarct size, and facilitate coronary artery repair. Urokinase and streptokinase are the two most frequently used thrombolytic agents. Both dissolve thrombi by converting circulating plasminogen, an inert precursor, into plasmin. One possible advantage of urokinase and streptokinase over new clot-specific agents is that the former have systemic fibrinolytic effects. This reduces blood viscosity and prevents other thrombi from forming. Angiography is the most objective technique for assessing reestablished arterial patency, but being invasive, it present disadvantages. Noninvasive criteria for coronary reperfusion include lowering of elevated ST-segments, shifting creatine kinase isoenzyme MB curves, and the appearance of reperfusion arrhythmias. Techniques for assessing myocardial salvage include thallium uptake, assessment of wall motion and myocardial thickening, ejection fraction, and positron emission tomography to assess infarct size. The role and appropriate timing of coronary artery repair after thrombolytic therapy are being studied.
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