Sudden Cardiac Death is an unexpected death due to a cardiac cause that occurs over a short time interval. It is a clinical event and outcome, most often linked to lethal heart rhythm disturbances (arrhythmias). It is discussed across cardiology, emergency medicine, electrophysiology, and critical care. It is commonly used when evaluating collapse, cardiac arrest, and prevention strategies such as implantable devices.

Cardiac Arrest is the sudden loss of effective cardiac mechanical function, causing collapse and absence of a palpable pulse. It is a time-critical emergency in cardiology, emergency medicine, and critical care. It reflects failure of the heart’s electrical system, mechanical pumping, or both. It is most commonly discussed in resuscitation (cardiopulmonary resuscitation), electrophysiology, and post–intensive care management.

Cardiogenic Shock is a life-threatening state of inadequate tissue perfusion caused by the heart’s inability to pump enough blood. It is a clinical syndrome in acute cardiovascular medicine and critical care. It is most commonly discussed in the setting of acute myocardial infarction, decompensated heart failure, and severe mechanical cardiac problems. It is used to guide urgent diagnosis, hemodynamic support, and definitive treatment of the underlying cause.

Embolism is the blockage of a blood vessel by material that travels from elsewhere in the body. It is a pathology concept used across cardiovascular, neurologic, and pulmonary medicine. It most often refers to a traveling blood clot, but other materials can also embolize. Clinicians use the term in acute care, imaging interpretation, and risk assessment.

Thrombosis is the formation of a blood clot (thrombus) inside a blood vessel or the heart. It is a pathologic process that can reduce or block blood flow to tissues. In cardiology, it is discussed in coronary artery disease, atrial fibrillation (AF), and prosthetic valve care. The term is commonly used across emergency medicine, internal medicine, cardiothoracic surgery, and critical care.

Plaque Rupture is the tearing of atherosclerotic plaque within an artery wall. It is a pathologic event most often discussed in coronary artery disease and acute coronary syndrome (ACS). It commonly triggers clot formation (thrombosis) that can suddenly reduce or block blood flow. It is used in cardiology, emergency medicine, and interventional practice to explain myocardial infarction mechanisms.

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.