Cardiac resynchronization therapy with defibrillator (CRT D) is an implantable cardiac device used in selected patients with heart failure and electrical dyssynchrony. It combines biventricular pacing (resynchronization) with an implantable cardioverter-defibrillator (ICD) function. CRT D is a therapy and device-based intervention in electrophysiology and heart failure care. It is commonly used in patients with reduced left ventricular ejection fraction (LVEF) and a widened QRS complex on electrocardiogram (ECG).

Device Implantation is the placement of a medical device inside the body to diagnose, monitor, or treat disease. In cardiology, it most often refers to implantable devices that support cardiac rhythm, circulation, or structural heart function. It is a procedural therapy and sometimes a diagnostic strategy. It is commonly used in arrhythmias, heart failure, and selected structural heart and vascular conditions.

Lead Extraction is the removal of one or more implanted cardiac device leads from the body. It is a procedural therapy used in cardiac electrophysiology and cardiothoracic care. It is most often discussed in the context of cardiac implantable electronic devices (CIEDs), such as pacemakers and implantable cardioverter-defibrillators (ICDs). It is commonly performed for infection, lead malfunction, or to regain venous access for new leads.

A Mapping Catheter is a specialized intracardiac catheter used to record and localize electrical activity inside the heart. It is a device used in cardiac electrophysiology, most commonly during an electrophysiology study (EPS) and catheter ablation. It helps clinicians identify arrhythmia mechanisms and target sites for therapy. It is routinely used in labs that evaluate supraventricular tachycardia (SVT), atrial fibrillation (AF), atrial flutter, and ventricular tachycardia (VT).

Electrophysiology Study is an invasive cardiac diagnostic test that evaluates how electrical signals start and travel through the heart. It is performed in an electrophysiology (EP) lab using catheter-based recordings from inside the heart. It is most commonly used in patients with suspected or known arrhythmias such as supraventricular tachycardia (SVT) or ventricular tachycardia (VT). It can be purely diagnostic or combined with catheter ablation as part of treatment planning.

Cardiac Arrhythmogenic Focus is a term for a localized area of heart tissue that initiates abnormal electrical impulses. It is a physiology and electrophysiology concept used to explain certain cardiac arrhythmias (abnormal heart rhythms). It is commonly discussed when interpreting an electrocardiogram (ECG) and when planning electrophysiology (EP) testing or catheter ablation. It helps clinicians describe “where the rhythm is starting” rather than only describing what the rhythm looks like.

Cardiac Complications are new or worsening heart-related problems that occur during the course of another illness, injury, or medical intervention. They are discussed across cardiology, internal medicine, emergency care, surgery, and critical care. They can involve the myocardium (heart muscle), valves, coronary arteries, pericardium, or the conduction system. The term is commonly used in hospital medicine, perioperative care, and when monitoring high-risk therapies.

Cardiac Morbidity means non-fatal health problems caused by heart disease or cardiac complications. It is an outcomes concept used in cardiology, cardiac surgery, emergency care, and perioperative medicine. It describes the burden of illness after events such as myocardial infarction, heart failure, arrhythmia, or cardiac procedures. It is commonly used in clinical documentation, research endpoints, and quality improvement reporting.

Cardiac Mortality means death that is attributed to a heart-related cause. It is an outcome concept used in clinical cardiology, epidemiology, and clinical trials. It commonly appears in risk stratification, quality metrics, and research endpoints. It is discussed across conditions such as coronary artery disease, heart failure, and arrhythmias.

Heart Healthy Lifestyle is a structured set of daily behaviors that support cardiovascular health and reduce cardiometabolic risk. It is a preventive and therapeutic concept used across cardiology, internal medicine, and primary care. It is commonly discussed in atherosclerotic cardiovascular disease (ASCVD) prevention, hypertension management, and cardiac rehabilitation. It is applied alongside diagnostic testing and medical therapy rather than replacing them.