Infective Endocarditis is an infection of the endocardial surface of the heart, most often involving a heart valve. It is a cardiovascular disease entity that sits at the intersection of cardiology, infectious diseases, and cardiac surgery. It is commonly discussed in the context of fever with a new murmur, bacteremia, embolic events, or prosthetic valve complications. It is typically evaluated using blood cultures and echocardiography.

Chagas Disease is an infectious parasitic disease caused by *Trypanosoma cruzi* (often abbreviated *T. cruzi*). It is clinically relevant in cardiology because it can lead to myocarditis and chronic cardiomyopathy. It is most often discussed in global health, infectious diseases, and heart failure/arrhythmia practice. It is commonly recognized in people with exposure in endemic areas and is increasingly encountered in non-endemic settings.

Takotsubo Cardiomyopathy is an acute, usually reversible syndrome of left ventricular (LV) systolic dysfunction. It often presents like acute coronary syndrome (ACS) with chest pain, electrocardiogram (ECG) changes, and elevated cardiac biomarkers. It is a cardiac pathology involving the myocardium rather than a primary coronary artery occlusion. It is commonly discussed in emergency medicine, cardiology, critical care, and inpatient telemetry settings.

Variant Angina is a form of angina pectoris caused by transient spasm of a coronary artery. It is a clinical syndrome within cardiology and emergency medicine that presents as episodic chest discomfort from myocardial ischemia. It is most commonly discussed in the context of electrocardiography (ECG) changes during symptoms and evaluation for acute coronary syndrome (ACS). It is also known as vasospastic angina and is historically associated with the term Prinzmetal angina.

Coronary Spasm is a sudden, transient narrowing of a coronary artery caused by contraction of vascular smooth muscle. It is a functional coronary disorder rather than a fixed anatomic blockage like atherosclerotic plaque. It is most often discussed in the context of chest pain syndromes, electrocardiogram (ECG) changes, and myocardial ischemia. It commonly arises in emergency care, outpatient chest pain evaluation, and the cardiac catheterization laboratory.

Reperfusion Therapy is treatment aimed at restoring blood flow to tissue that is acutely ischemic (low blood flow). It is a therapeutic strategy most often used in acute coronary syndromes, especially ST-elevation myocardial infarction (STEMI). Its goal is to reopen an occluded coronary artery and limit the extent of myocardial infarction (heart muscle death). It is delivered using catheter-based procedures, medications that dissolve clot, or surgery, depending on the case and setting.

Contrast Dye is a substance used to make blood vessels and organs more visible on medical imaging. It is most commonly used in diagnostic tests and procedures in radiology and cardiology. In cardiovascular care, it helps outline the coronary arteries, cardiac chambers, and great vessels. It is frequently used during coronary angiography, computed tomography (CT), and some echocardiography studies.

Sheath Insertion is the placement of a short tube (an introducer sheath) into a blood vessel to create stable vascular access. It is a procedural technique used in interventional cardiology, electrophysiology, and cardiothoracic critical care. It allows catheters, wires, and devices to enter and exit the vessel with less trauma and improved control. It is commonly performed for cardiac catheterization, coronary angiography, and structural heart interventions.

Femoral Access is the placement of a needle, sheath, or catheter into the femoral artery and/or femoral vein. It is a procedural technique used to reach the central circulation for diagnosis or treatment. It is most commonly used in cardiology, interventional radiology, and critical care. It is frequently discussed in cardiac catheterization, coronary angiography, and structural heart procedures.

Transradial Access is a vascular access approach that uses the radial artery at the wrist. It is a procedural technique in interventional cardiology and endovascular medicine. It is commonly used for coronary angiography and percutaneous coronary intervention (PCI). It can also be used for some peripheral and structural heart procedures, depending on case and equipment.