A Premature Ventricular Contraction is an early heartbeat that starts in the ventricles (the heart’s lower chambers). It interrupts the usual heart rhythm and is often felt as a “skipped beat” or a brief “thump.” It is commonly identified on an electrocardiogram (ECG/EKG) or ambulatory heart monitor. Clinicians discuss it when evaluating palpitations, irregular pulse findings, or rhythm monitoring results.

PAC most commonly refers to a **pulmonary artery catheter**. It is a flexible, balloon-tipped catheter placed through a large vein into the right side of the heart and the pulmonary artery. Clinicians use it to measure **hemodynamics** (blood flow and pressures) in real time. PAC monitoring is most often used in intensive care units (ICUs), operating rooms, and specialized cardiac care settings.

Premature Atrial Contraction is an early heartbeat that starts in the atria, the heart’s upper chambers. It is a common type of “extra beat” and is often noticed as a skipped beat or brief flutter. Clinicians most often identify it on an ECG or heart rhythm monitor. It is discussed in cardiology when evaluating palpitations and other rhythm concerns.

Junctional Rhythm is a heart rhythm that starts near the atrioventricular (AV) junction instead of the heart’s usual natural pacemaker. It often appears when the sinus node slows down or its signals do not reach the ventricles normally. It is most commonly recognized on an electrocardiogram (ECG) or heart monitor. Clinicians use it as a clue to how the heart’s electrical system is functioning.

WPW is short for Wolff–Parkinson–White, a condition involving an extra electrical connection in the heart. It can be seen on an electrocardiogram (ECG) as a “pre-excitation” pattern and can be associated with episodes of rapid heart rhythm. WPW is commonly discussed in cardiology, emergency care, and electrophysiology (heart rhythm medicine). Some people have ECG findings of WPW without symptoms, while others have palpitations or fast heartbeats.

Wolff-Parkinson-White Syndrome is a heart rhythm condition involving an extra electrical connection in the heart. It can allow electrical signals to bypass the normal pathway and trigger episodes of fast heartbeat. It is commonly recognized on an electrocardiogram (ECG/EKG) and discussed in arrhythmia (heart rhythm) care. It is most often used as a clinical label when symptoms or clinically important tachycardia occur in the setting of pre-excitation.

AVRT stands for **atrioventricular reentrant tachycardia**, a type of fast heart rhythm (tachycardia). It happens when an extra electrical connection allows a “loop” circuit between the atria and ventricles. AVRT is a common cause of **supraventricular tachycardia (SVT)**, meaning the rhythm starts above the ventricles. It is most often discussed in emergency care, cardiology clinics, and electrophysiology (heart rhythm) practice.

AV Reentrant Tachycardia is a fast heart rhythm (tachycardia) caused by an electrical “loop” that repeatedly circles between the atria and ventricles. It is a form of supraventricular tachycardia (SVT), meaning it starts above the ventricles, even though the ventricles often beat fast during the episode. It commonly occurs in people with an extra electrical connection (an accessory pathway) between the atria and ventricles. Clinicians discuss AV Reentrant Tachycardia in emergency care, cardiology clinics, and electrophysiology (EP) labs when evaluating episodes of sudden rapid heartbeat.

AVNRT is short for **atrioventricular nodal reentrant tachycardia**, a common type of **supraventricular tachycardia (SVT)**. It describes a **fast heart rhythm** that starts above the ventricles and involves the **AV node** (the electrical “gateway” between atria and ventricles). AVNRT often occurs in **sudden episodes** that begin and end abruptly. The term is commonly used in emergency care, cardiology clinics, and electrophysiology (heart rhythm) practice.

AV Nodal Reentrant Tachycardia is a common type of supraventricular tachycardia (SVT), meaning a fast heart rhythm that starts above the ventricles. It happens when an electrical “short circuit” forms in or near the atrioventricular (AV) node, a normal relay station in the heart’s conduction system. It often causes sudden episodes of rapid, regular palpitations that start and stop abruptly. The term is commonly used in emergency care, cardiology clinics, and electrophysiology (heart rhythm) practice to describe and treat a specific SVT mechanism.

Paroxysmal SVT is a heart rhythm problem where the heart suddenly races and then stops just as suddenly. “SVT” means supraventricular tachycardia, or a fast rhythm that starts above the ventricles (the heart’s main pumping chambers). “Paroxysmal” means the episodes come and go rather than being constant. The term is commonly used in clinic notes, emergency care, ECG interpretations, and electrophysiology (heart rhythm) discussions.

SVT is a type of abnormally fast heart rhythm that starts above the heart’s ventricles. SVT commonly causes sudden episodes of rapid heartbeat, often felt as palpitations. SVT is a clinical term used in cardiology, emergency medicine, and primary care. SVT is typically diagnosed with an electrocardiogram (ECG) and rhythm monitoring.

Supraventricular Tachycardia is a fast heart rhythm that starts above the ventricles (the heart’s lower pumping chambers). It usually involves the atria or the atrioventricular (AV) node, which are parts of the heart’s electrical system. People often describe it as a sudden racing heartbeat that may start and stop abruptly. The term is commonly used in emergency care, outpatient cardiology, and heart rhythm (electrophysiology) clinics.

Atrial Flutter is a common abnormal heart rhythm (arrhythmia) that starts in the atria, the heart’s upper chambers. It is usually caused by a rapid, organized electrical “loop” that makes the atria beat very fast. It can lead to a fast pulse, shortness of breath, fatigue, or no symptoms at all. The term is commonly used in ECG interpretation, emergency care, cardiology clinics, and electrophysiology (heart rhythm) practice.

AF is short for atrial fibrillation. It is a common heart rhythm disorder where the upper chambers (atria) beat in a disorganized way. AF is often discussed in clinics, hospitals, ECG reports, and wearable heart rhythm alerts. It matters because it can affect symptoms, heart function, and stroke risk.

Atrial Fibrillation is a common abnormal heart rhythm (arrhythmia). It happens when the upper chambers of the heart (the atria) beat in a rapid, disorganized way. This can make the pulse irregular and sometimes fast. The term is used in clinics, hospitals, ECG reports, and cardiology discussions to describe this specific rhythm pattern.

Arrhythmia means an abnormal heart rhythm. It can describe a heartbeat that is too fast, too slow, or irregular. Arrhythmia is a common term in cardiology visits, ECG reports, and emergency care. It is used to link symptoms like palpitations or fainting to the heart’s electrical system.

Cardiac Fibrosis is a process where normal heart muscle tissue is partly replaced or surrounded by scar-like connective tissue. It can develop after injury (such as a heart attack) or from long-term stress on the heart (such as high blood pressure). It is commonly discussed in cardiology because it can affect heart pumping, relaxation, and electrical stability. It is assessed using clinical history and tests like echocardiography and cardiac MRI, and sometimes with biopsy.

Ventricular Remodeling describes changes in the size, shape, and function of a heart ventricle over time. It most often refers to the left ventricle, the main pumping chamber that sends blood to the body. These changes can happen after a heart attack, with long-standing high blood pressure, or with valve disease. Clinicians use the term to describe both harmful changes and improvement (“reverse remodeling”) with treatment.

LVH stands for **left ventricular hypertrophy**. It means the **muscle wall of the heart’s left ventricle is thicker than expected**. LVH is commonly discussed in **blood pressure care, valve disease, and cardiology imaging reports**. It can be found on an **ECG**, an **echocardiogram (heart ultrasound)**, or a **cardiac MRI**.