Unstable angina and non ST elevation acute coronary syndromes

Area of Science:

• Cardiology
• Internal Medicine

Background:

• Acute coronary syndromes (ACSs) are a leading cause of hospitalization for coronary artery disease (CAD).
• ACS encompasses unstable angina (UA), non-ST elevation myocardial infarction (NSTEMI), and ST-elevation myocardial infarction (STEMI).
• Pathophysiology involves vulnerable atherosclerotic plaque rupture and thrombus formation, often from lesions with <50% stenosis.

Purpose of the Study:

• To review the pathophysiology, clinical presentations, diagnosis, risk stratification, and management of UA/NSTEMI.
• To emphasize optimal management strategies, including early invasive versus initial conservative approaches.
• To discuss current management in light of recent clinical trial data and guidelines.

Main Methods:

• Review of current literature on ACS pathophysiology and management.
• Analysis of clinical trial data and American College of Cardiology/American Heart Association (ACC/AHA) guidelines.
• Discussion of therapeutic options, including medical therapy and mechanical reperfusion.

Main Results:

• UA and NSTEMI are closely related and often indistinguishable upon emergency department presentation.
• Optimal management strategies are still debated, but early invasive approaches are common in US tertiary care hospitals.
• Aggressive medical therapy (statins, anti-platelets, beta-blockers, ACE-inhibitors) and mechanical reperfusion (PCI, CABG) are complementary.

Conclusions:

• Clinical practice guidelines have improved patient care for ACS.
• Evidence supports aggressive medical therapy and mechanical reperfusion as integral components of ACS management.
• The optimal balance between invasive and conservative strategies requires ongoing evaluation based on clinical evidence.