Acute Coronary Syndrome: Diagnosis and Initial Management
Raman Nohria1, Anthony J Viera1
1Duke University School of Medicine, Durham, North Carolina.
Insights
Acute coronary syndrome (ACS) involves reduced blood flow to the heart muscle. Prompt diagnosis and management, including angiography and dual antiplatelet therapy, are crucial for reducing mortality in patients with ACS.
Area of Science:
- Cardiology
- Internal Medicine
Background:
- Acute coronary syndrome (ACS) encompasses ST-elevation myocardial infarction and non-ST-elevation ACS, including unstable angina.
- Key risk factors for ACS include advanced age, smoking, hypertension, diabetes, hyperlipidemia, obesity, and a family history of early coronary artery disease.
Purpose of the Study:
- To summarize the definition, risk factors, diagnostic indicators, and management strategies for acute coronary syndrome.
- To highlight the importance of timely intervention and evidence-based therapies in improving outcomes for ACS patients.
Main Methods:
- Review of clinical definitions and diagnostic criteria for ACS.
- Analysis of predictive symptoms and electrocardiography findings.
- Summary of current treatment guidelines, including revascularization and pharmacotherapy.
- Identification of mortality-reducing interventions post-myocardial infarction.
Main Results:
- Substernal chest discomfort radiating to the arms or jaw is highly predictive of ACS.
- Electrocardiography changes like ST depression/elevation and T-wave inversion are key indicators.
- Elevated troponin levels without ST-elevation suggest non-ST-elevation ACS.
- Coronary angiography with revascularization, dual antiplatelet therapy, statins, beta-blockers, and SGLT2 inhibitors are recommended management strategies.
Conclusions:
- Early recognition of ACS symptoms and risk factors is essential for timely diagnosis.
- Comprehensive management involving revascularization and guideline-directed medical therapy significantly impacts patient outcomes.
- Lifestyle modifications and preventative measures like smoking cessation and cardiac rehabilitation further reduce mortality in patients with a history of myocardial infarction.
Abstract:
Acute coronary syndrome (ACS) is defined as reduced blood flow to the coronary myocardium manifesting as ST-segment elevation myocardial infarction or non-ST-segment elevation ACS, which includes unstable angina and non-ST-segment elevation myocardial infarction. Common risk factors include being at least 65 years of age or a current smoker or having hypertension, diabetes mellitus, hyperlipidemia, a body mass index greater than 25 kg per m2, or a family history of premature coronary artery disease. Symptoms most predictive of ACS include chest discomfort that is substernal or spreading to the arms or jaw. However, chest pain that can be reproduced with palpation or varies with breathing or position is less likely to signify ACS. Having a prior abnormal cardiac stress test result indicates increased risk. Electrocardiography changes that predict ACS include ST depression, ST elevation, T-wave inversion, or presence of Q waves. No validated clinical decision tool is available to rule out ACS in the outpatient setting. Elevated troponin levels without ST-segment elevation on electrocardiography suggest non-ST-segment elevation ACS. Patients with ACS should receive coronary angiography with percutaneous or surgical revascularization. Other important management considerations include initiation of dual antiplatelet therapy and parenteral anticoagulation, statin therapy, beta-blocker therapy, and sodium-glucose cotransporter-2 inhibitor therapy. Additional interventions shown to reduce mortality in patients who have had a recent myocardial infarction include smoking cessation, annual influenza vaccination, and cardiac rehabilitation.
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