Immediate Management of ST‑Elevation Myocardial Infarction (STEMI)
Reperfusion Strategy
- Primary percutaneous coronary intervention (PCI) performed within 90–120 minutes of first medical contact is the definitive reperfusion strategy; it should be accompanied by immediate aspirin, a potent P2Y12 inhibitor, anticoagulation, and direct transfer to the catheterization laboratory bypassing the emergency department. – European Society of Cardiology (ESC) guideline, Class I, Level A 1
- ECG confirmation of persistent ST‑segment elevation must be obtained at first medical contact (ambulance or hospital) to establish the STEMI diagnosis. – ESC guideline 1
- If primary PCI can be achieved within 120 minutes of STEMI diagnosis by an experienced team, it is the mandatory reperfusion approach. – ESC guideline 1
- Patients should be transferred directly to the catheterization laboratory, bypassing the emergency department and CCU/ICU. – ESC guideline 1
- The 90–120‑minute window is measured from first medical contact, not from hospital arrival. – ESC guideline 1
- Primary PCI is indicated for all patients presenting with symptom duration ≤12 hours. – ESC guideline 1
- When primary PCI cannot be performed within 120 minutes, fibrinolytic therapy should be administered immediately, preferably in the pre‑hospital setting. – ESC guideline 1
- Fibrin‑specific thrombolytic agents are recommended; tenecteplase is preferred, with alteplase or reteplase as alternatives. – ESC guideline 1
- All patients who receive fibrinolysis must be transferred without delay to a PCI‑capable centre for subsequent invasive management. – ESC guideline 1
Immediate Pharmacotherapy
Antiplatelet Therapy
- Aspirin 160–325 mg orally (or intravenously if the patient cannot swallow) should be given immediately upon STEMI diagnosis. – ESC guideline 1
- A potent P2Y12 inhibitor (prasugrel or ticagrelor) should be administered before or at the time of PCI, preferred over clopidogrel. – ESC guideline 1
- Dual antiplatelet therapy (aspirin + P2Y12 inhibitor) is continued for 12 months unless the patient has a high bleeding risk. – ESC guideline 1
Anticoagulation
- For primary PCI, unfractionated heparin is given as a weight‑adjusted intravenous bolus followed by infusion; fondaparinux is contraindicated. – ESC guideline 1
- For fibrinolytic therapy, enoxaparin (initial IV dose followed by sub‑cutaneous dosing) is preferred over unfractionated heparin and is continued until revascularisation or hospital discharge (up to 8 days). – ESC guideline 1
Post‑Fibrinolysis Management
- Rescue PCI should be performed immediately if fibrinolysis fails (defined as <50 % ST‑segment resolution at 60–90 minutes) or if the patient develops haemodynamic or electrical instability. – ESC guideline 1
- Emergency angiography is indicated for patients who develop heart failure or cardiogenic shock, irrespective of fibrinolysis success. – ESC guideline 1
- In stable patients with successful fibrinolysis, routine angiography is recommended 2–24 hours after thrombolysis. – ESC guideline (Class IIa, Level B) and ACC/AHA guideline [1][2]
- Emergency angiography is required for recurrent ischemia or evidence of re‑occlusion. – ESC guideline 1
Monitoring and Assessment
- Routine transthoracic echocardiography during the hospital stay should be performed to evaluate left‑ and right‑ventricular function, detect mechanical complications, and exclude left‑ventricular thrombus. – ESC guideline 1
Special Populations
- In patients presenting with cardiogenic shock or acute heart failure, emergency angiography and PCI are indicated regardless of the elapsed time from symptom onset. – ESC guideline 1
All facts are derived from the European Society of Cardiology (2018) and American College of Cardiology/American Heart Association (2013) guidelines, with the citation IDs indicated after each statement.
Optimal Treatment Window for Acute Myocardial Infarction
Primary Treatment Windows
- The European Society of Cardiology recommends reperfusion therapy in all patients with symptoms of ischemia of ≤12 hours duration and persistent ST-segment elevation, with primary PCI being the preferred strategy when performed by an experienced team within 120 minutes of STEMI diagnosis 3, 4
- Reperfusion therapy should be initiated as soon as possible after symptom onset, with the greatest benefit observed within the first hours, according to the American College of Cardiology 5, 3
- A powerful time-dependent effect on mortality has been observed with thrombolytic therapy, with 35 lives saved per 1000 patients when used within the first hour compared to 16 lives saved per 1000 when given 7-12 hours after symptom onset, as reported by the Journal of the American College of Cardiology 5
Reperfusion Strategy Based on Time Windows
Within 12 Hours of Symptom Onset
- Primary PCI is the preferred reperfusion strategy when performed by an experienced team within 120 minutes of STEMI diagnosis, as recommended by the European Society of Cardiology 3, 6
- If primary PCI cannot be performed in a timely manner, fibrinolytic therapy should be administered within 12 hours of symptom onset in patients without contraindications, according to the European Heart Journal 3, 4
12-24 Hours After Symptom Onset
- Reperfusion therapy (preferably primary PCI) is indicated if there is evidence of ongoing ischemia, even if symptoms started >12 hours before or if pain and ECG changes have been stuttering, as stated by the European Heart Journal 4, 6
Beyond 24 Hours After Symptom Onset
- Routine PCI of a totally occluded artery >24 hours after symptom onset in stable patients without signs of ischemia is not recommended, according to the European Heart Journal 4, 7
Adjunctive Therapies
- Aspirin (160-325 mg orally or IV if unable to swallow) should be administered as soon as possible, as recommended by the American College of Cardiology and the European Society of Cardiology 5, 3, 6
- A potent P2Y12 inhibitor (prasugrel or ticagrelor, or clopidogrel if these are unavailable) should be administered before or at the time of PCI, as recommended by the European Society of Cardiology 3, 6
Special Considerations
- Emergency angiography and PCI are indicated in patients with heart failure/shock regardless of time from symptom onset, as recommended by the European Society of Cardiology 3, 6