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

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...
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of 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...
Electrocardiogram01:29

Electrocardiogram

An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
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.
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...

You might also read

Related Articles

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

Sort by
Same author

What happens when public primary care is ill-prepared to respond to non-communicable diseases: a mixed-method study of diabetes and hypertension care in urban Nepal.

Journal of global health·2026
Same author

An enhanced hypergraph CNN with adaptive focal loss for automated ECG heartbeat classification.

Scientific reports·2026
Same author

Co-creation, co-design or co-production? Reflections on the development of urban health systems implementation strategies to improve access and quality of primary healthcare services in Bangladesh, Ghana, Nepal and Nigeria.

Health research policy and systems·2026
Same author

Review Article: Ileal Bile Acid Transport (IBAT) Inhibitors as an Emerging Treatment for Cholestatic Liver Disease.

Alimentary pharmacology & therapeutics·2026
Same author

Editorial: Cholestasis Is an Important Marker for Evaluating Clinical Outcomes and Prognosis in Severe Burns and Critically Ill Patients.

Alimentary pharmacology & therapeutics·2026
Same author

Evaluation and management of primary sclerosing cholangitis patients awaiting liver transplantation.

JHEP reports : innovation in hepatology·2026

Related Experiment Video

Updated: Jul 4, 2026

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
10:17

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

Microvolt T-wave alternans testing for ventricular arrhythmia risk stratification.

Theodore Chow1, Deepak Joshi

  • 1Lindner Center at The Christ Hospital, Ohio Heart & Vascular Center, 2123 Auburn Ave, Ste 139, Cincinnati, OH 45219, USA. chowt@ohioheart.org

Expert Review of Cardiovascular Therapy
|June 24, 2008
PubMed
Summary

Microvolt T-wave alternans (MTWA) helps stratify sudden cardiac death risk in cardiomyopathy patients. This review clarifies MTWA

More Related Videos

Measurement of Heart Contractility in Isolated Adult Human Primary Cardiomyocytes
09:17

Measurement of Heart Contractility in Isolated Adult Human Primary Cardiomyocytes

Published on: August 9, 2022

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
06:07

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

Published on: May 23, 2021

Related Experiment Videos

Last Updated: Jul 4, 2026

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
10:17

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

Measurement of Heart Contractility in Isolated Adult Human Primary Cardiomyocytes
09:17

Measurement of Heart Contractility in Isolated Adult Human Primary Cardiomyocytes

Published on: August 9, 2022

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
06:07

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

Published on: May 23, 2021

Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Microvolt T-wave alternans (MTWA) is investigated for sudden cardiac death risk stratification in cardiomyopathy patients.
  • Clinical interest focuses on MTWA's ability to identify patients for prophylactic implantable cardioverter defibrillators (ICDs).

Purpose of the Study:

  • To provide background and review studies on MTWA for risk stratification.
  • To clarify the role of MTWA in clinical practice.
  • To present a framework for incorporating MTWA into patient care.

Main Methods:

  • Review of existing clinical data and studies on MTWA.
  • Analysis of MTWA's accuracy in identifying high-risk patients.
  • Evaluation of MTWA's potential to expand ICD eligibility.

Main Results:

  • Clinical data accumulation has not fully clarified MTWA's role for end-users.
  • MTWA testing aims to improve identification of patients benefiting from ICDs.
  • Further research explores MTWA for primary prevention ICD guidelines.

Conclusions:

  • A framework for integrating MTWA into clinical practice is proposed.
  • Clarification of MTWA's utility is needed for widespread adoption.
  • MTWA holds potential for refining sudden cardiac death risk assessment.