Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 8/22/2025

Acute Coronary Syndrome Management

Diagnosis and Risk Stratification

  • Evaluate left ventricular function using resting echocardiography, as recommended by the European Society of Cardiology 1
  • Consider stress testing or coronary angiography for risk stratification, as recommended by the European Society of Cardiology 1
  • Assess the "5 P's" in acute limb ischemia: pain, paralysis, paresthesia, pulselessness, and pallor, as suggested by the American Heart Association 2
  • Perform detailed arterial evaluation to identify the etiology and anatomical level of obstruction, as recommended by the American Heart Association 2
  • Obtain a 12-lead ECG within 10 minutes of first medical contact to classify ACS as either ST-segment elevation (STEMI) or non-ST-segment elevation (NSTEMI/UA), and draw blood for high-sensitivity cardiac troponin (repeat at 1-3 hours) for patients with suspected acute coronary syndrome, as recommended by the European Society of Cardiology and the American College of Cardiology 3, 4, 5, 6, 7, 8, 9
  • Use the GRACE score to risk stratify patients with ACS, with a score >140 indicating high risk and a score >109 and <140 indicating intermediate risk, as recommended by the American Heart Association 3, 8

  • Use the TIMI Risk Score to correlate with increasing risk of adverse outcomes:

    Score Risk of death/MI/urgent revascularization
    0-1 4.7%
    6-7 40.9%

Treatment

  • Administer aspirin 150-300mg loading dose, followed by 75-100mg daily maintenance indefinitely, as part of antiplatelet therapy for patients with ACS, as recommended by the European Society of Cardiology, the American College of Cardiology, and the American Heart Association 3, 4, 5, 7, 9
  • Administer a P2Y12 inhibitor, such as ticagrelor or prasugrel, for 12 months in addition to aspirin, unless contraindicated, as recommended by the European Society of Cardiology and the American College of Cardiology 3, 8, 10
  • Use beta-blockers as part of the immediate pharmacological treatment, and within 24 hours if no contraindications are present, such as signs of heart failure, low-output state, or increased risk for cardiogenic shock, as recommended by the American Heart Association 3, 8
  • Use low molecular weight heparin or unfractionated heparin as part of the anticoagulation strategy 3, 11
  • Start high-intensity statin therapy as early as possible in patients with acute coronary syndrome, as recommended by the European Society of Cardiology 3
  • Use angiotensin-converting enzyme inhibitors (ACEIs) or angiotensin II receptor blockers (ARBs) in patients with left ventricular dysfunction, heart failure, hypertension, or diabetes, as recommended by the European Society of Cardiology 3
  • Perform urgent coronary angiography within the first 24 hours to guide revascularization decisions 3, 11
  • Revascularization of the left anterior descending artery can be achieved through percutaneous coronary intervention (PCI) for single-vessel disease or coronary artery bypass grafting (CABG) for left main or three-vessel disease, especially with left ventricular dysfunction 3, 11
  • Use an immediate invasive strategy (<2 hours) for patients with hemodynamic instability, cardiogenic shock, life-threatening arrhythmias, or ongoing ischemia despite medical therapy, as suggested by the European Society of Cardiology 3, 12
  • Use an early invasive strategy (<24 hours) for high-risk patients with a GRACE score >140, dynamic ECG changes, or elevated troponin, according to the European Society of Cardiology 3, 12

Prevention and Rehabilitation

  • Encourage risk factor modification, including smoking cessation, blood pressure control, diabetes management, dietary modification, and regular physical activity, as recommended by the European Society of Cardiology 4
  • Initiate high-intensity statin therapy and optimize secondary prevention measures, as recommended by the European Society of Cardiology 3
  • Continue dual antiplatelet therapy for 12 months after percutaneous coronary intervention (PCI) 3
  • Schedule follow-up appointments 1-2 weeks for high-risk patients and 2-6 weeks for low-risk patients or those who have undergone revascularization, as recommended by the American College of Cardiology 13
  • Provide patient education on symptoms of acute myocardial infarction, worsening ischemia, medication management, and when to seek emergency care, as recommended by the American College of Cardiology, with a Class I recommendation for patient education 14
  • Recommend annual influenza vaccination for patients with chronic coronary syndrome, especially in the elderly, as suggested by the European Society of Cardiology 1
  • Recommend rehabilitation based on exercise as an effective means for patients with chronic coronary syndrome to achieve a healthy lifestyle and manage risk factors, as suggested by the European Society of Cardiology 1

Special Populations

  • In patients with Turner syndrome, echocardiography and cardiac MRI are recommended to evaluate aortic dilatation and congenital defects, as suggested by the American Heart Association 15
  • Use the aortic size index (ASI) to define the degree of aortic dilatation and assess the risk of dissection, as suggested by the American Heart Association 15
  • In patients with Turner syndrome and ASI >2.3 cm/m², annual aortic surveillance is recommended, as suggested by the American Heart Association 15
  • Manage patients with Wellens syndrome with an invasive strategy, including urgent coronary angiography (within the first 24 hours) and revascularization of the left anterior descending artery to prevent an extensive and potentially fatal anterior infarct, as recommended by the European Society of Cardiology 3, 11

REFERENCES

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