Thrombolytic Treatment of STEMI
Primary Thrombolytic Agents
- The European Society of Cardiology recommends using a fibrin-specific thrombolytic agent, such as tenecteplase, alteplase, or reteplase, as the primary thrombolytic medication for STEMI when fibrinolysis is the chosen reperfusion strategy, with a Class I, Level B recommendation 1, 2, 3
- Alteplase should be administered as an infusion over approximately 90 minutes 1
- For patients ≥75 years of age, the European Society of Cardiology suggests considering half-dose tenecteplase to reduce bleeding risk while maintaining efficacy 4
Essential Adjunctive Antiplatelet Therapy
- The European Society of Cardiology recommends administering aspirin as soon as possible, with a Class I, Level B recommendation 1, 3, 5
- The American College of Cardiology recommends clopidogrel in addition to aspirin, with a Class I, Level A recommendation, and a loading dose of 300 mg is reasonable for patients <75 years 1, 2, 3, 6
- Clopidogrel should be continued for at least 14 days, with consideration for up to 12 months 6, 4
Mandatory Anticoagulation Co-Therapy
- The European Society of Cardiology recommends anticoagulation in all patients receiving thrombolytics until revascularization or for hospital duration up to 8 days, with enoxaparin as the preferred option over unfractionated heparin (UFH) 1, 2, 3, 7, 5, 8
- Unfractionated heparin (UFH) is recommended as a Class I, Level B option, with a weight-adjusted IV bolus followed by infusion 1, 3, 5
- Fondaparinux is recommended as a Class IIa, Level B option, specifically for patients treated with streptokinase (non-fibrin-specific agent) 4
Timing and Administration
- The European Society of Cardiology recommends initiating fibrinolytic therapy as soon as possible after STEMI diagnosis, preferably in the pre-hospital setting, with a Class I, Level A recommendation, and the greatest mortality benefit occurs when treatment is given within 6 hours of symptom onset 1, 2, 3, 4
- Efficacy decreases substantially after 3 hours, making primary PCI increasingly preferable as time from symptom onset increases 4