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Related Concept Videos

Increased pulse rate01:17

Increased pulse rate

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...
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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...
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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...
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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 minute.
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

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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Related Experiment Video

Updated: May 9, 2026

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine
10:08

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

Published on: February 17, 2018

Idiopathic ventricular tachycardia.

G T Altemose1, A E Buxton

  • 1Department of Medicine, Temple University School of Medicine, Philadelphia, Pennsylvania 19140, USA.

Annual Review of Medicine
|March 12, 1999
PubMed
Summary
This summary is machine-generated.

Idiopathic ventricular tachycardia occurs without structural heart disease. Recognizing its distinct forms, including Brugada syndrome, is crucial for internists and cardiologists.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Internal Medicine

Background:

  • Ventricular tachycardias (VT) often occur in patients with underlying structural heart disease.
  • Idiopathic VT (IVT) specifically refers to arrhythmias in individuals lacking structural heart disease, metabolic derangements, or long QT syndrome.
  • Understanding IVT is essential for managing cardiac arrhythmias.

Purpose of the Study:

  • To delineate the distinct forms of idiopathic ventricular tachycardia.
  • To highlight the clinical significance of recognizing these arrhythmias.
  • To inform internists and general cardiologists about IVT syndromes.

Main Methods:

  • Review of clinical presentations and electrocardiographic characteristics of IVT.
  • Classification of IVT based on origin and associated conditions.
  • Discussion of mechanisms, pharmacologic responses, and prognosis.

Main Results:

  • Identified four common forms of IVT: mitral valve prolapse-associated VT, right ventricular outflow tract VT, left ventricular VT, and Brugada syndrome.
  • Brugada syndrome is linked to cardiac arrest in individuals without apparent structural heart disease.
  • Each IVT form presents unique electrocardiographic signatures and clinical behaviors.

Conclusions:

  • Idiopathic ventricular tachycardias are distinct syndromes requiring specific diagnostic and management approaches.
  • Familiarity with IVT, including Brugada syndrome, is vital for internists and cardiologists.
  • Most IVT forms have a favorable prognosis, emphasizing the importance of accurate diagnosis.