Coronary Artery Disease (Unstable Angina)

Coronary Artery Disease (Unstable Angina) is a heart condition where the blood flow to the heart muscle is suddenly reduced but not completely blocked. It affects the coronary arteries, which supply oxygen-rich blood to the heart. This condition causes chest pain or discomfort that can happen even at rest or with minimal activity. The pain occurs because the heart muscle is not getting enough oxygen, which can lead to serious problems like a heart attack. It is a warning sign that the heart's blood supply is unstable and needs urgent medical attention. The main health impact is the risk of progression to a full blockage causing permanent heart damage. Early recognition and diagnosis are critical to prevent severe complications.

Coronary Artery Disease (Unstable Angina) is defined as a clinical syndrome characterized by new or worsening chest pain due to transient myocardial ischemia without myocardial necrosis. It results from rupture or erosion of an atherosclerotic plaque in a coronary artery, leading to platelet aggregation and partial thrombus formation that significantly reduces coronary blood flow. Unlike stable angina, the ischemia occurs unpredictably and may occur at rest or with minimal exertion. It is a form of acute coronary syndrome and represents an unstable phase of atherosclerotic disease with high risk for progression to myocardial infarction. The major clinical significance lies in its potential to cause sudden cardiac events and the need for urgent evaluation and management to prevent irreversible myocardial injury.