Unstable angina pectoris

Area of Science:

• Cardiology
• Internal Medicine
• Vascular Disease

Background:

• Unstable angina is a spectrum of coronary artery disease symptoms between stable angina and myocardial infarction.
• It presents as recent onset, changing pattern, or rest angina, potentially preceding acute myocardial infarction or sudden death.
• Pathophysiology involves reduced coronary flow to myocardium during increased oxygen demand, potentially leading to infarction.

Purpose of the Study:

• To review the clinical presentation, pathophysiology, and management of unstable angina.
• To assess the evolving incidence of acute myocardial infarction and death associated with unstable angina.
• To evaluate current therapeutic strategies and their impact on patient outcomes.

Main Methods:

• Review of existing literature and studies on unstable angina management.
• Analysis of patient risk stratification based on clinical presentation and preceding cardiac history.
• Evaluation of the efficacy of medical therapies (nitrates, anticoagulants, beta-blockers) and surgical interventions (aortocoronary bypass).

Main Results:

• Recent studies show reduced rates of acute myocardial infarction (under 15.5%) and death (under 2%) compared to earlier reports.
• High-risk patients include those with persistent pain at rest and a history of stable angina or myocardial infarction.
• Medical management, particularly with beta-blockers, has shown effectiveness in pain control and reducing myocardial infarction rates.

Conclusions:

• Unstable angina requires prompt medical attention due to its potential for severe cardiac events.
• Therapeutic approaches are evolving, with a trend towards medical stabilization using beta-blockade.
• Coronary angiography and surgery are considered for patients unresponsive to optimal medical therapy or those at high risk.