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

Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

241
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...
241
Electrocardiogram01:29

Electrocardiogram

5.0K
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...
5.0K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

1.2K
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...
1.2K
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

11.2K
The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
11.2K
Pulse rhythm01:30

Pulse rhythm

1.2K
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
1.2K
Instrumentation Amplifier01:25

Instrumentation Amplifier

942
An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
942

You might also read

Related Articles

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

Sort by
Same author

Cardiac Implantable Electronic Devices Remote Programming.

Circulation. Arrhythmia and electrophysiology·2026
Same author

Early complications and long-term outcome of patients treated with a Subcutaneous Cardioverter-Defibrillator: temporal trends and clinical implications of the anesthetic strategies adopted at implant.

Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology·2026
Same author

Incidence and type of recurrent ventricular arrhythmia in patients with arrhythmic mitral valve prolapse and implantable cardioverter defibrillator for secondary prevention.

Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology·2026
Same author

A Multi-Center Trained Residual Neural Network for Robust Classification of Atrial High-Rate Episodes in Remotely Monitored Pacemakers and Defibrillators.

Sensors (Basel, Switzerland)·2026
Same author

Antiarrhythmics Management During Electrophysiology Procedures: A Stepwise Approach.

Journal of cardiovascular electrophysiology·2026
Same author

Management of patients with atrial tachycardia: a clinical consensus statement of the European Heart Rhythm Association (EHRA) of the ESC, endorsed by the Heart Rhythm Society (HRS), the Asia Pacific Heart Rhythm Society (APHRS), the Latin American Heart Rhythm Society (LAHRS), and the Association for European Paediatric and Congenital Cardiology (AEPC).

Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology·2025

Related Experiment Video

Updated: Dec 23, 2025

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
16:40

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation

Published on: February 28, 2012

26.7K

Electrogram morphology discriminators in implantable cardioverter defibrillators: A comparative evaluation.

Antonio Frontera1,2, Marc Strik1,2,3, Romain Eschalier4

  • 1Cardio-Thoracic Unit, Bordeaux University Hospital (CHU), Pessac, France.

Journal of Cardiovascular Electrophysiology
|April 26, 2020
PubMed
Summary

Morphology algorithms in implantable cardioverter defibrillators (ICDs) vary significantly. Boston Scientific and Abbott demonstrated superior discrimination between ventricular tachycardia (VT) and supraventricular tachycardia (SVT) compared to Medtronic.

Keywords:
algorithmarrhythmiadiscriminationimplantable cardioverter defibrillatormorphology

More Related Videos

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

1.5K
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

4.2K

Related Experiment Videos

Last Updated: Dec 23, 2025

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
16:40

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation

Published on: February 28, 2012

26.7K
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

1.5K
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

4.2K

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • Morphology algorithms are standard discriminators in single-chamber implantable cardioverter defibrillators (ICDs).
  • Proprietary algorithms exhibit variations in design and programming.
  • Accurate discrimination between ventricular tachycardia (VT) and supraventricular tachycardia (SVT) is crucial for ICD function.

Purpose of the Study:

  • To compare the discriminative capabilities of three different morphology algorithms from major manufacturers.
  • To evaluate the impact of nominal versus advanced programming on algorithm performance.
  • To assess sensitivity and specificity in distinguishing VT from SVT.

Main Methods:

  • Analysis of 534 VT and SVT episodes collected from Abbott, Boston Scientific, and Medtronic ICDs across nine European centers.
  • Utilizing remote monitoring data and atrioventricular comparison for episode classification.
  • Receiver operating characteristic (ROC) curve analysis to determine sensitivity and specificity at various morphology match thresholds.

Main Results:

  • Boston Scientific RhythmID (AUC: 0.95) and Abbott Far Field MD (AUC: 0.91) showed superior discrimination between VT and SVT compared to Medtronic Wavelet (AUC: 0.81).
  • All devices achieved high sensitivity for VT detection at nominal settings, but specificity for SVT discrimination varied (Abbott: 85%, Medtronic: 62%, Boston Scientific: 41%).
  • Optimizing the percentage match threshold improved Boston Scientific's SVT specificity to 79% without reducing VT sensitivity.

Conclusions:

  • Significant performance differences exist among proprietary morphology discriminators for SVT detection.
  • The clinical impact of these variations on overall ICD discrimination requires further investigation.
  • Algorithm optimization may enhance the specificity of SVT discrimination in ICDs.