Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Impact of indoor ventilation on TB transmission risk: implications of climate change.

The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease·2026
Same author

The Relationship Between Scoliosis, Spinal Bone Density, and Truncal Muscle Strength in Familial Dysautonomia Patients.

Calcified tissue international·2023
Same author

Magnetic Resonance-only Workflow: Implementation in a UK Centre.

Clinical oncology (Royal College of Radiologists (Great Britain))·2019
Same author

Case of Frequent Uterine Hemorrhagy, with Incessant Discharge of the Liquor Amnii, Four Months Previous to Labour; with Some Remarks on the Ergot of Rye.

The London medical and physical journal·2018
Same author

Correlates of burnout among professionals working with people with intellectual and developmental disabilities.

Journal of intellectual disability research : JIDR·2018
Same author

Letters.

The Israel Medical Association journal : IMAJ·2017

Related Experiment Video

Updated: Jul 26, 2026

Isolation and Functional Characterization of Human Ventricular Cardiomyocytes from Fresh Surgical Samples
14:39

Isolation and Functional Characterization of Human Ventricular Cardiomyocytes from Fresh Surgical Samples

Published on: April 21, 2014

Idiopathic ventricular tachycardia. A review.

R Brooks1, J H Burgess

  • 1Department of Medicine, Montreal General Hospital, Quebec, Canada.

Medicine
|September 1, 1988
PubMed
Summary

Idiopathic ventricular tachycardia (VT) in patients with seemingly normal hearts remains poorly understood. Further research is needed to determine if underlying heart disease contributes to these arrhythmias and affects their prognosis.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Pathophysiology

Background:

  • Idiopathic ventricular tachycardia (VT) affects patients without obvious heart disease.
  • The underlying causes and cardiac substrate of these arrhythmias are often unclear.
  • Some patients have minor cardiac abnormalities, but their role in VT genesis is uncertain.

Purpose of the Study:

  • To investigate the role of undetermined or covert heart disease in idiopathic VT.
  • To clarify the pathophysiology and prognosis of VT in patients with structurally normal hearts.
  • To determine if a subset of these patients has a truly benign condition due to primary electrical abnormalities.

Main Methods:

  • Correlation of electrophysiological data with pathological findings.

More Related Videos

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
06:57

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

Published on: January 31, 2019

Location, Dissection, and Analysis of the Murine Stellate Ganglion
07:50

Location, Dissection, and Analysis of the Murine Stellate Ganglion

Published on: December 22, 2020

Related Experiment Videos

Last Updated: Jul 26, 2026

Isolation and Functional Characterization of Human Ventricular Cardiomyocytes from Fresh Surgical Samples
14:39

Isolation and Functional Characterization of Human Ventricular Cardiomyocytes from Fresh Surgical Samples

Published on: April 21, 2014

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
06:57

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

Published on: January 31, 2019

Location, Dissection, and Analysis of the Murine Stellate Ganglion
07:50

Location, Dissection, and Analysis of the Murine Stellate Ganglion

Published on: December 22, 2020

  • Assessment of cardiac function and identification of minor abnormalities.
  • Review of clinical outcomes and prognosis in idiopathic VT patients.

    • Main Results:

    • The cause of idiopathic VT is often unrecognized, even with minor cardiac abnormalities.
    • While generally well-tolerated with a favorable prognosis, occasional deaths suggest it's not always benign.
    • The contribution of unrecognized heart disease to VT genesis and natural history requires further investigation.

    Conclusions:

    • Distinguishing between primary electrical abnormalities and underlying heart disease is crucial for understanding idiopathic VT.
    • Further studies correlating functional and structural data are needed to elucidate the pathophysiology.
    • Clarifying the role of covert heart disease may identify a truly benign subgroup with a favorable prognosis.