Atherosclerosis is a chronic disease of arteries characterized by plaque formation within the vessel wall. In plain terms, it is a process where fats, inflammatory cells, and fibrous tissue build up and narrow or stiffen arteries. It is a core topic in cardiovascular pathology and vascular medicine. It is commonly discussed in coronary artery disease (CAD), stroke, and peripheral artery disease (PAD).

Coronary Artery Disease is a cardiovascular disease in which the coronary arteries cannot deliver adequate blood flow to the heart muscle. It most often reflects atherosclerosis (plaque buildup) within epicardial coronary arteries. It is a central diagnosis in cardiology because it causes myocardial ischemia, angina, and myocardial infarction. It is commonly discussed in emergency care, outpatient risk assessment, cardiac imaging, and interventional and surgical planning.

Ischemic Heart Disease is a clinical condition in which the heart muscle (myocardium) receives insufficient blood flow and oxygen. It is most often discussed in the context of coronary artery disease (CAD) and acute coronary syndrome (ACS). It is a core topic in cardiology that connects anatomy, pathophysiology, diagnosis, and treatment planning. It is commonly used when evaluating chest pain, myocardial infarction (MI), heart failure, and sudden cardiac death risk.

Silent Ischemia is myocardial ischemia that occurs without typical anginal symptoms. It is a clinical concept in cardiology that links coronary perfusion, myocardial oxygen balance, and risk assessment. It is most commonly discussed in coronary artery disease (CAD) evaluation and in stress testing or ambulatory electrocardiography. It matters because ischemia can be present even when a patient reports no chest pain.

Unstable Angina is chest discomfort caused by myocardial ischemia without evidence of myocardial necrosis. It is a clinical syndrome within the spectrum of acute coronary syndrome (ACS). It is most commonly discussed in emergency and inpatient cardiology, where rapid risk assessment is needed. It is defined by symptoms and context, supported by electrocardiography (ECG) and cardiac biomarkers.

Stable Angina is a predictable pattern of chest discomfort caused by transient myocardial ischemia (reduced blood flow to heart muscle). It is a clinical syndrome within cardiology, most commonly related to coronary artery disease (CAD). Symptoms typically occur with exertion or emotional stress and improve with rest or short-acting nitrates. It is used in history-taking, risk stratification, and decisions about noninvasive testing and coronary angiography.

Angina Pectoris is chest discomfort caused by reduced blood flow (ischemia) to the heart muscle (myocardium). It is a clinical syndrome, not a single disease, most often linked to coronary artery disease (CAD). It sits at the intersection of cardiovascular physiology, ischemic heart disease pathology, and acute-care triage. The term is commonly used in emergency medicine, cardiology clinics, stress testing labs, and perioperative assessment.

NSTEMI stands for non–ST-segment elevation myocardial infarction. It is a type of acute myocardial infarction (heart attack) diagnosed using symptoms, electrocardiography (ECG), and cardiac biomarkers (especially troponin). NSTEMI is part of acute coronary syndrome (ACS), a clinical domain focused on urgent ischemic heart disease. It is commonly used in emergency, inpatient, cardiology, and critical care settings for triage and management decisions.

STEMI stands for **ST-elevation myocardial infarction**. It is a **type of acute myocardial infarction (heart attack)** defined by characteristic changes on the **electrocardiogram (ECG)** and evidence of myocardial injury. STEMI belongs to the clinical domain of **cardiovascular pathology and emergency diagnosis**, centered on the **coronary arteries and myocardium**. The term is commonly used in **emergency medicine, cardiology, critical care, prehospital care, and cath lab workflows**.

Myocardial Infarction is injury and death of heart muscle (myocardium) caused by inadequate blood flow. It is a disease entity within cardiology and emergency medicine, most often related to coronary artery disease (CAD). It is commonly discussed as part of acute coronary syndrome (ACS) and long-term ischemic heart disease. It is recognized using symptoms, electrocardiography (ECG), and cardiac biomarkers such as troponin.