Approach to STEMI and NSTEMI
Lal C Daga1, Upendra Kaul, Aijaz Mansoor
1Fortis Escorts Heart Institute and Research Center, Okhla Road, New Delhi- 100028.
Insights
Acute coronary syndrome (ACS) involves symptoms of acute myocardial ischemia, including ST-elevated myocardial infarction (STEMI), non-ST elevated myocardial infarction (NSTEMI), and unstable angina (UA). Prompt diagnosis and treatment are crucial for restoring blood flow and minimizing heart damage.
Area of Science:
- Cardiology
- Internal Medicine
- Emergency Medicine
Background:
- Acute coronary syndrome (ACS) presents with symptoms indicative of acute myocardial ischemia.
- ACS encompasses ST-elevated myocardial infarction (STEMI), non-ST elevated myocardial infarction (NSTEMI), and unstable angina (UA).
Purpose of the Study:
- To outline the diagnostic criteria and management principles for acute coronary syndrome.
- To differentiate between STEMI, NSTEMI, and UA based on clinical presentation and biomarkers.
Main Methods:
- Diagnosis relies on patient history, physical examination, electrocardiogram (ECG), cardiac biomarkers, and echocardiography (ECHO).
- Classification of ACS subtypes is based on ECG findings and cardiac enzyme levels.
Main Results:
- STEMI is characterized by complete coronary occlusion and specific ECG criteria.
- NSTEMI involves elevated cardiac biomarkers without ST elevation, often due to coronary narrowing or microembolization.
- Unstable angina (UA) is diagnosed in the absence of elevated cardiac enzymes.
Conclusions:
- Effective ACS management necessitates rapid diagnosis, accurate risk stratification, and timely interventions.
- Therapies should aim to restore coronary blood flow and alleviate myocardial ischemia.
Abstract:
Acute coronary syndrome (ACS) refers to any constellation of clinical symptoms that are compatible with acute myocardial ischemia. ACS is divided into ST- elevated myocardial infarction (STEMI), non-ST elevated myocardial infarction (NSTEMI), and unstable angina (UA). STEMI results from complete and prolonged occlusion of an epicardial coronary blood vessel and is defined based on ECG criteria..NSTEMI usually results from severe coronary artery narrowing, transient occlusion, or microembolization of thrombus and/or atheromatous material. NSTEMI is defined by an elevation of cardiac biomarkers in the absence of ST elevation. The syndrome is termed UA in the absence of elevated cardiac enzymes. History, physical examination, ECG, biochemical markers, ECHO all remain important tools to make an appropriate diagnosis The management of ACS should focus on rapid diagnosis, risk stratification, and institution of therapies that restore coronary blood flow and reduce myocardial ischemia.
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