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

4.6K
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...
4.6K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

251
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...
251
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

233
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...
233
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

1.1K
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...
1.1K
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

10.4K
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...
10.4K
Pulse rhythm01:30

Pulse rhythm

1.1K
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...
1.1K

You might also read

Related Articles

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

Sort by
Same author

Ultrafast oscillations in the human brain and their functional significance.

Epilepsia·2026
Same author

Effect of atropine on time to cardiac arrest in hypoxic bradycardia: a randomised cross-over study in a porcine apnoea model.

BJA open·2026
Same author

UHF-ECG Outperforms QRS Duration and Morphology in Predicting Responders to Biventricular Cardiac Resynchronization Therapy.

JACC. Clinical electrophysiology·2026
Same author

Critical illness impairs coordinated myogenesis: a prospective longitudinal study of skeletal muscle progenitor cell biology using serial muscle biopsies (SATELLITE study).

Critical care (London, England)·2026
Same author

Immunohistochemistry for p16 and p53 Provides Substantial Agreement With Molecular Tests in Penile Cancer.

Pathology international·2026
Same author

Treatment of supraventricular arrhythmias in critical care patients with sepsis.

Frontiers in cardiovascular medicine·2026

Related Experiment Video

Updated: Nov 14, 2025

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

1.2K

Ventricular activation pattern assessment during right ventricular pacing: Ultra-high-frequency ECG study.

Karol Curila1, Pavel Jurak2, Josef Halamek2

  • 1Cardiocenter, Third Faculty of Medicine, Charles University and University Hospital Kralovske Vinohrady, Prague, Czech Republic.

Journal of Cardiovascular Electrophysiology
|March 8, 2021
PubMed
Summary

Right ventricular pacing location impacts ventricular synchrony. Pacing the right ventricular inflow tract (RVIT) offers better synchrony than other sites, but His bundle pacing is superior for minimizing delays.

Keywords:
conductive systemmyocardialpacingultra-high frequency ECGventricular dyssynchrony

More Related Videos

Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping
08:19

Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping

Published on: February 22, 2018

10.2K
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

15.0K

Related Experiment Videos

Last Updated: Nov 14, 2025

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

1.2K
Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping
08:19

Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping

Published on: February 22, 2018

10.2K
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

15.0K

Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Imaging

Background:

  • Right ventricular (RV) pacing can lead to delayed activation of distant ventricular segments, potentially causing dyssynchrony.
  • Understanding the impact of different RV pacing sites on ventricular activation patterns is crucial for optimizing cardiac function.

Purpose of the Study:

  • To investigate and compare ventricular depolarization patterns using ultra-high-frequency ECG (UHF-ECG) during pacing at various right ventricular locations.
  • To quantify the delays in left and right ventricular lateral wall activation based on pacing site.

Main Methods:

  • Utilized UHF-ECG in 51 patients to analyze ventricular activation during temporary pacing at distinct RV sites: septum (mSp), inflow tract (RVIT), outflow tract (RVOT), apex, and anterior/lateral wall.
  • Also included basal RV septum pacing with nonselective His bundle or right bundle branch capture (nsHBorRBBp).
  • Quantified left ventricular lateral wall delay (LVLWd) and right ventricular lateral wall delay (RVLWd).

Main Results:

  • Nonselective His bundle or RBB capture (nsHBorRBBp) resulted in the shortest LVLWd (11 ms).
  • Right ventricular inflow tract (RVIT) pacing showed shorter LVLWd (19 ms) compared to RV outflow tract (RVOT) pacing (33 ms), despite similar QRS durations.
  • RV apical pacing exhibited the longest RVLWd (17 ms) and significantly longer LVLWd compared to septal pacing.

Conclusions:

  • Right ventricular inflow tract (RVIT) pacing demonstrates improved ventricular synchrony compared to other myocardial capture sites.
  • However, His bundle or proximal right bundle branch pacing (nsHBorRBBp) yields even greater synchrony, with less observed dyssynchrony on UHF-ECG.