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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

2.9K
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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Imaging Studies for Cardiovascular System I:Echocardiography01:17

Imaging Studies for Cardiovascular System I:Echocardiography

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Cardiac imaging studies encompass a wide range of noninvasive and minimally invasive techniques designed to visualize the heart's structure and function in detail. One such technique is echocardiography, which uses high-frequency ultrasound waves to produce detailed images of the heart, known as echocardiograms.
Indications: Echocardiography is utilized to diagnose heart failure, valve disorders, and myocardial infarction. It also assesses cardiac structures' size, shape, and motion,...
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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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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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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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Imaging Studies for Cardiovascular System II:Types of Echocardiography01:20

Imaging Studies for Cardiovascular System II:Types of Echocardiography

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Echocardiography plays a role in assessing cardiac health and detecting heart conditions, with various types providing critical insights for diagnosis and treatment.
Types of Echocardiography
Transthoracic Echocardiography (TTE)
TTE is the most common type of echocardiogram which involves placing a transducer on the patient's chest, emitting sound waves to create heart images. TTE is invaluable for evaluating the heart's size, structure, and motion, making it particularly useful for...
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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Electrocardiographic imaging in the atria.

Ismael Hernández-Romero1, Rubén Molero2, Carlos Fambuena-Santos2

  • 1ITACA, Universitat Politècnica de València, Valencia, Spain. isherro@itaca.upv.es.

Medical & Biological Engineering & Computing
|November 12, 2022
PubMed
Summary

Electrocardiographic imaging (ECGI) reconstructs cardiac electrical activity noninvasively. This review details ECGI methods for characterizing challenging atrial arrhythmias, highlighting current limitations and future research directions.

Keywords:
Atrial arrhythmiasCatheter ablationElectrocardiographic imagingInverse solutionTreatment guidance

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Area of Science:

  • Biomedical Engineering
  • Cardiac Electrophysiology
  • Medical Imaging

Background:

  • The inverse problem of electrocardiography, or electrocardiographic imaging (ECGI), reconstructs cardiac electrical activity from noninvasive recordings.
  • ECGI has applications in characterizing both atrial and ventricular arrhythmias, but its use for atrial arrhythmias presents unique challenges.
  • Understanding atrial mechanisms driving abnormal propagation, premature beats, and reentrant arrhythmias remains complex.

Purpose of the Study:

  • To review current ECGI methodologies, regularization techniques, and post-processing approaches applied to atrial arrhythmias.
  • To outline the existing advantages and limitations of ECGI in research and clinical diagnosis of atrial arrhythmias.
  • To identify areas for future ECGI development to address unmet needs in atrial arrhythmia characterization.

Main Methods:

  • Review of existing literature on ECGI methodologies for atrial applications.
  • Analysis of regularization and post-processing techniques used in electrocardiographic imaging.
  • Evaluation of ECGI's current capabilities and constraints in the context of atrial arrhythmias.

Main Results:

  • Various ECGI methodologies, regularization strategies, and post-processing techniques are employed for atrial analysis.
  • ECGI offers insights into atrial arrhythmias but faces challenges in accurately describing underlying mechanisms.
  • Current advantages and limitations in research and clinical settings are identified.

Conclusions:

  • ECGI is a developing tool for noninvasive cardiac electrical mapping, with specific challenges in atrial applications.
  • Further research is needed to refine ECGI methods for better characterization of atrial arrhythmias.
  • Concentrated efforts on specific ECGI advancements are required to meet clinical and research needs for atrial arrhythmias.