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

Electrocardiogram01:29

Electrocardiogram

10.1K
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...
10.1K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

2.1K
Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
2.1K
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

731
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...
731
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

489
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...
489
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

20.4K
An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage....
20.4K
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

845
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...
845

You might also read

Related Articles

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

Sort by
Same author

Clinical Relevant Immunosuppressive Drugs Differentially Modulate Axonal Outgrowth from Human Stem Cell-Derived Neurons.

bioRxiv : the preprint server for biology·2026
Same author

Letter to the Editor, "Global Oral Health: Defining the Research Agenda in the Public Interest".

Journal of dental research·2026
Same author

Shaping the future: Current landscape and potential impact of educating children and adolescents on antimicrobial resistance - a systematic review and narrative synthesis.

Public health·2026
Same author

The Effect of Crown Design on Fracture Strength and Mode of Implant-supported Molar Crown Bonded to Titanium-based Abutment.

The journal of contemporary dental practice·2025
Same author

Determinants of sustainable adoption in primary care of a clinical decision support system for antimicrobial prescribing: A qualitative study.

Infectious diseases now·2025
Same author

Calcaneal fracture with ipsilateral bi-malleolar and fourth and fifth metatarsal fractures.

BMJ case reports·2025

Related Experiment Video

Updated: Apr 18, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

24.9K

The ' widow maker': Electrocardiogram features that should not be missed.

M Yusuf Muharam, R Ahmad, My Harmy

    Malaysian Family Physician : the Official Journal of the Academy of Family Physicians of Malaysia
    |January 22, 2015
    PubMed
    Summary

    Wellen's syndrome, characterized by specific ECG changes, indicates critical blockage in the left anterior descending artery. Early recognition of this "widow maker" condition is crucial to prevent myocardial infarction.

    Keywords:
    Wellen's syndromemyocardial infarctionwidow maker

    More Related Videos

    Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography
    09:23

    Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography

    Published on: November 24, 2016

    14.0K
    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

    15.6K

    Related Experiment Videos

    Last Updated: Apr 18, 2026

    A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
    18:11

    A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

    Published on: December 28, 2012

    24.9K
    Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography
    09:23

    Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography

    Published on: November 24, 2016

    14.0K
    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

    15.6K

    Area of Science:

    • Cardiology
    • Internal Medicine
    • Emergency Medicine

    Background:

    • Wellen's syndrome is a critical condition characterized by specific electrocardiogram (ECG) abnormalities.
    • It is associated with proximal left anterior descending (LAD) coronary artery stenosis.
    • This syndrome is often under-recognized and carries a high risk of myocardial infarction.

    Observation:

    • Patients present with chest pain and characteristic precordial T-wave changes on ECG.
    • A case study details a 39-year-old male with coronary artery disease and typical Wellen's syndrome ECG findings.
    • The condition is sometimes referred to as the "widow maker" due to its potentially fatal consequences.

    Findings:

    • Specific ECG T-wave changes in Wellen's syndrome are indicative of critical LAD stenosis.
    • Prompt identification of Wellen's syndrome is essential for timely intervention.
    • The syndrome portends a high risk of developing a large anterior wall myocardial infarction.

    Implications:

    • Increased awareness and recognition of Wellen's syndrome among clinicians are vital.
    • Early diagnosis can lead to prompt revascularization, potentially preventing myocardial infarction.
    • Understanding the ECG patterns associated with Wellen's syndrome can improve patient outcomes and reduce mortality.