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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

2.4K
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...
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Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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

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

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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...
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Pulse rhythm01:30

Pulse rhythm

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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...
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Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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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...
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Cardiac Action Potential01:30

Cardiac Action Potential

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Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
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Related Experiment Video

Updated: Jul 9, 2025

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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Comparison of electrogram characteristics in persistent atrial fibrillation.

Jeffrey J Goldberger1, Ghaith Zaatari1, Raul D Mitrani1

  • 1Department of Medicine, Division of Cardiology, University of Miami, Miami, Florida, USA.

Journal of Cardiovascular Electrophysiology
|November 30, 2023
PubMed
Summary

Different electrogram analysis techniques for atrial fibrillation (AF) ablation show poor correlation. Only some characteristics predict ablation success, suggesting combined electrogram properties may be needed for improved mapping.

Keywords:
Shannon's entropyatrial fibrillationcycle lengthdominant frequencyelectrogramsmapping

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Technology

Background:

  • Atrial fibrillation (AF) management relies on electrogram analysis, but no single technique reliably guides catheter ablation.
  • Existing methods for evaluating electrograms during AF lack established efficacy in directing ablation procedures.

Purpose of the Study:

  • To compare various electrogram properties recorded from multiple right atrial (RA) and left atrial (LA) sites.
  • To assess the correlation between different electrogram characteristics and their predictive value for AF ablation outcomes.

Main Methods:

  • Multisite mapping of 42 patients undergoing AF ablation, analyzing 21,846 electrogram signals.
  • Evaluation of electrogram characteristics including cycle length (CL), amplitude, Shannon's entropy (ShEn), fractionation interval, dominant frequency, organizational index, and CL of most recurrent morphology (CLR).

Main Results:

  • Seven of eight electrogram characteristics showed poor to moderate correlation, indicating they do not identify similar atrial regions.
  • Shannon's entropy (ShEn) and fractionation interval exhibited a strong negative correlation (r = -0.94).
  • Shorter minimum CLR, lower minimum ShEn, and longer minimum CL were associated with successful ablation, with minimal overlap in top-identified sites across characteristics.

Conclusions:

  • Multiple electrogram analysis techniques exist for AF, but most are poorly correlated and do not pinpoint similar locations.
  • Only certain electrogram characteristics predict ablation outcomes, necessitating further research into combined properties for improved AF mapping and categorization.