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Related Concept Videos

Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
135
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

112
Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
112
Increased pulse rate01:17

Increased pulse rate

747
Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
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Related Experiment Video

Updated: Sep 8, 2025

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
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Bidirectional Ventricular Tachycardia: Challenges and Solutions.

Ahmed Almarzuqi1, Shane Kimber1, Kenneth Quadros1

  • 1Division of Cardiology, Department of Medicine, Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Canada.

Vascular Health and Risk Management
|June 14, 2022
PubMed
Summary
This summary is machine-generated.

Bidirectional ventricular tachycardia (BiVT) is a rare arrhythmia with alternating QRS morphologies. This review explores its definition, electrocardiogram findings, causes, and treatment.

Keywords:
bidirectional ventricular tachycardiacatecholaminergic polymorphic ventricular tachycardiadigoxin toxicitydual reentryventricular arrhythmia

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Arrhythmology

Background:

  • Bidirectional ventricular tachycardia (BiVT) is a rare ventricular arrhythmia characterized by alternating QRS morphologies on surface electrocardiograms.
  • Historically linked to digoxin toxicity, BiVT is now recognized in various conditions like myocarditis, sarcoidosis, and genetic channelopathies.

Purpose of the Study:

  • To provide a comprehensive review of bidirectional ventricular tachycardia.
  • To elucidate the definition, electrocardiographic features, underlying mechanisms, associated conditions, and therapeutic strategies for BiVT.

Main Methods:

  • Literature review of existing studies and case reports on BiVT.
  • Synthesis of current understanding regarding the pathophysiology and clinical presentation of BiVT.

Main Results:

  • BiVT presents with distinct beat-to-beat alternation in QRS morphology.
  • Potential mechanisms include triggered activity, abnormal automaticity, and reentry circuits.
  • Associated conditions highlight the diverse etiology of BiVT.

Conclusions:

  • Bidirectional ventricular tachycardia is a complex arrhythmia requiring a thorough understanding of its multifaceted nature.
  • Further research into the precise mechanisms and optimal management of BiVT is warranted.