Arrhythmia Management Glossary

The portion of an ECG representing ventricular depolarization, appearing as a series of upward and downward deflections.

Sudden loss of consciousness caused by quinidine-induced torsades de pointes. A rare but potentially fatal complication...

Occurrence of a ventricular premature beat during the vulnerable period of ventricular repolarization, corresponding to...

A pacemaker feature that automatically adjusts heart rate based on physiologic demand sensors during physical activity.

Pacemaker algorithm designed to prevent sudden rate changes by gradually transitioning between different heart rates.

Bundle branch block that appears only at certain heart rates, typically at faster rates. Also known as phase 3 or tachyc...

A rapid heart rhythm caused by electrical impulses circulating repeatedly through an abnormal pathway in the heart.

Wireless transmission of device data from implanted cardiac devices to healthcare providers for continuous patient surve...

Electrical conduction traveling in the reverse direction through the heart's conduction system, typically from ventricle...

Targeted ablation of rotating electrical waves (rotors) identified as drivers of persistent atrial fibrillation.

A subcutaneous implantable cardioverter-defibrillator that provides shock therapy without transvenous leads.

The voltage magnitude of intrinsic cardiac signals detected by pacemaker or ICD leads.

Group of heart rhythm disorders caused by malfunction of the sinoatrial node, resulting in alternating bradycardia and t...

Class III antiarrhythmic medication with beta-blocking properties, used for both atrial and ventricular arrhythmias.

Emergency treatment protocols for electrical storm, characterized by recurrent ventricular arrhythmias requiring multipl...

Electrophysiological mapping technique that identifies abnormal myocardial tissue serving as the anatomical basis for ar...

A rapid heart rhythm originating above the ventricles, typically involving the atria or AV junction.

A specific type of polymorphic ventricular tachycardia characterized by QRS complexes that appear to twist around the ba...

An ultrasound examination of the heart performed using a probe inserted into the esophagus for enhanced cardiac imaging.

A procedure involving puncture of the atrial septum to gain access to the left atrium during cardiac interventions.

Abnormal cardiac electrical activity initiated by afterdepolarizations that occur as a result of a preceding action pote...

Failure of a pacemaker or ICD to detect intrinsic cardiac electrical activity when it should be sensed.

A life-threatening arrhythmia characterized by chaotic, ineffective ventricular contractions that prevent blood circulat...

A specific type of ventricular tachycardia that responds to verapamil therapy. Typically originates from the right ventr...