What are the recommended steps from admission through to percutaneous coronary intervention (PCI) for a patient presenting with an acute myocardial infarction?

Steps from Admission to PCI for Acute Myocardial Infarction

For patients presenting with STEMI, obtain a 12-lead ECG within 10 minutes of first medical contact, administer aspirin immediately, and transfer directly to the catheterization laboratory bypassing the emergency department, with a target door-to-balloon time of ≤90 minutes at PCI-capable hospitals or ≤120 minutes for inter-facility transfers. 1

Immediate Actions at First Medical Contact (0-10 Minutes)

ECG and Diagnosis

• Obtain and interpret a 12-lead ECG within 10 minutes of first medical contact to identify ST-elevation or STEMI-equivalents (new LBBB, isolated anterior ST-depression with aVR elevation, hyperacute T-waves) 1, 2
• Initiate continuous ECG monitoring with defibrillator capacity immediately in all suspected STEMI patients 1

Initial Pharmacotherapy

• Administer aspirin 150-325 mg orally (or 250-500 mg IV if unable to swallow) as soon as possible 1, 2
• Avoid routine supplemental oxygen unless oxygen saturation is <90% 1, 2

Reperfusion Strategy Selection and Timing (10-30 Minutes)

Direct Admission to PCI-Capable Hospital

• Activate the catheterization laboratory immediately upon STEMI diagnosis 1, 2
• Transfer patient directly to the catheterization laboratory, bypassing the emergency department and CCU/ICCU 1, 2
• Target door-to-balloon time ≤90 minutes from first medical contact 1, 2

Transfer from Non-PCI-Capable Hospital

• If anticipated first-medical-contact-to-device time is ≤120 minutes, transfer immediately for primary PCI 1
• Maintain door-in-door-out time ≤30 minutes at the referring hospital 1
• If anticipated delay to PCI exceeds 120 minutes, administer fibrinolytic therapy within 10-30 minutes of diagnosis, then transfer for angiography within 3-24 hours 1

Critical exception: Primary PCI is mandatory regardless of time delay in patients with cardiogenic shock, acute severe heart failure, contraindications to fibrinolysis, or failed fibrinolysis 1

Pre-PCI Antithrombotic Therapy (During Transfer)

Antiplatelet Therapy

• Administer a potent P2Y12 inhibitor before or at the time of PCI: prasugrel 60 mg loading dose OR ticagrelor 180 mg loading dose (use clopidogrel 600 mg only if prasugrel/ticagrelor unavailable or contraindicated) 1, 2
• For patients receiving fibrinolysis, use clopidogrel only (prasugrel and ticagrelor are contraindicated with fibrinolysis) 1

Anticoagulation

• Administer unfractionated heparin 100 U/kg IV bolus (reduce to 60 U/kg if GPIIb/IIIa inhibitor planned) 1, 2
• Enoxaparin or bivalirudin are acceptable alternatives 1
• Fondaparinux is contraindicated for primary PCI 1, 2

Technical Standards During Primary PCI

Access and Device Selection

• Use routine radial arterial access to minimize bleeding complications 2, 3
• Implant drug-eluting stents (DES) as the default device 2, 3
• Routine thrombus aspiration and deferred stenting are contraindicated 2

Multivessel Disease Management

• Evaluate severe non-infarct-related artery stenoses (by angiography or FFR) and consider revascularization before hospital discharge, either during index PCI or staged 1, 2
• In cardiogenic shock, perform non-IRA PCI during the index procedure 1, 2
• In stable patients without shock, staged PCI of non-culprit lesions is reasonable but should not be performed during index PCI unless the patient is stable with uncomplicated culprit revascularization 1

Special Clinical Scenarios

Cardiogenic Shock

• Perform emergency angiography and PCI immediately, regardless of time from symptom onset 1
• Consider intra-aortic balloon pump or alternative left-ventricular assist devices for hemodynamic stabilization 2
• In-hospital mortality with primary PCI in shock is approximately 18.8%, but 56% of patients >75 years survive to discharge 2

Cardiac Arrest with STEMI

• Patients with resuscitated cardiac arrest and ST-elevation on post-resuscitation ECG should undergo immediate primary PCI 1, 2
• Initiate targeted temperature management early in unresponsive patients; avoid pre-hospital cooling with large volumes of cold IV fluid 1

Late Presentation (>12 Hours)

• Primary PCI is reasonable for patients presenting 12-24 hours after symptom onset with severe heart failure, hemodynamic/electrical instability, or persistent ischemia 1
• Routine PCI of an occluded infarct-related artery >48 hours after symptom onset is not indicated in asymptomatic patients 1

Post-PCI In-Hospital Management

Monitoring

• Monitor all STEMI patients for at least 24 hours after reperfusion therapy 2
• Perform routine echocardiography during hospitalization to assess LV/RV function, detect mechanical complications, and exclude LV thrombus 1, 2

Dual Antiplatelet Therapy

• Continue aspirin 75-100 mg daily plus prasugrel 10 mg daily or ticagrelor 90 mg twice daily for 12 months 1, 2
• Add a proton pump inhibitor in patients at high risk of gastrointestinal bleeding 2

Evidence-Based Medications

• Start oral beta-blockers in patients with heart failure and/or LVEF <40% unless contraindicated 1, 2
• Initiate ACE inhibitors within 24 hours in patients with heart failure, LV systolic dysfunction, diabetes, or anterior infarction 1, 2
• Begin high-intensity statin therapy as early as possible, targeting LDL-C <1.8 mmol/L (70 mg/dL) 2

Common Pitfalls to Avoid

• Do not delay PCI to "stabilize" patients with active bleeding or other relative contraindications; the mortality risk from untreated STEMI exceeds procedural bleeding risk 2
• Do not perform PCI of non-infarct-related arteries during index PCI in patients with cardiogenic shock, as this increases mortality 1
• Do not use routine thrombus aspiration, as it does not improve outcomes and may increase stroke risk 2
• Do not bypass the catheterization laboratory for emergency department evaluation in transferred patients, as this adds critical delays 1, 4, 5
• Do not use fondaparinux as anticoagulation for primary PCI 1, 2