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Electrocardiogram01:29

Electrocardiogram

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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

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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 Rhythms01:24

ECG Interpretation of Rhythms

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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....
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Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow...
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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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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Digital Electrocardiographic Complex for Risk Stratification of Paroxysmal Atrial Fibrillation.

A V Frolov1, O P Melnikova2, A P Vorobiev2

  • 1DSc, Professor, Head of the Laboratory of Medical Information Technologies; Republican Scientific and Practical Centre "Cardiology", Ministry of Health of the Republic of Belarus, 110 R. Luxembourg St., Minsk, 220036, Belarus.

Sovremennye Tekhnologii V Meditsine
|December 9, 2024
PubMed
Summary

A new system, Intecard 8.1, identifies hidden atrial fibrillation (AF) using ECGs in sinus rhythm. It analyzes P-wave markers, showing high accuracy in predicting AF episodes in patients with heart conditions.

Keywords:
atrial fibrillationdigital electrocardiographyheart rate controlsinus heart rhythm“Intecard 8.1”

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Area of Science:

  • Cardiology and Medical Informatics
  • Electrocardiography and Arrhythmia Detection
  • Biomedical Engineering and Signal Processing

Background:

  • Hidden atrial fibrillation (AF) poses diagnostic challenges, often requiring advanced detection methods.
  • Standard ECGs in sinus rhythm may not reveal intermittent AF, necessitating analysis of subtle electrical instability markers.
  • Early identification of individuals at risk for hidden AF is crucial for timely intervention and stroke prevention.

Purpose of the Study:

  • To develop and clinically validate a hardware-software system for identifying predictors of hidden AF using 12-lead ECGs in sinus rhythm.
  • To assess specific P-wave characteristics and derived scores as indicators of atrial electrical instability.
  • To evaluate the system's efficacy in predicting AF episodes in patients with ischemic heart disease or dilated cardiomyopathy.

Main Methods:

  • Development of the "Intecard 8.1" system analyzing 3-5-minute ECG recordings in sinus rhythm.
  • Assessment of markers: P-wave amplitude (<0.1 mV), duration (>120 ms), interatrial block, terminal P-wave area (<-4 mV·ms), and MVP score (>3).
  • Clinical testing on 120 patients; phase transformation method used for improved P-wave detection.

Main Results:

  • The Intecard 8.1 system identified 18.3% of patients with subsequent AF episodes over 12-22 months.
  • Patients with AF showed decreased P-wave amplitude (p=0.029), increased duration (p<0.001), and higher MVP scores (p<0.01).
  • The MVP score (>3) demonstrated high prognostic significance (AUC=0.988), with 92% sensitivity and 89% specificity for predicting hidden AF.

Conclusions:

  • The "Intecard 8.1" digital electrocardiographic complex effectively identifies patients at high risk for hidden AF using standard ECGs in sinus rhythm.
  • Dynamic assessment of P-wave parameters enables personalized risk stratification and management of atrial fibrillation.
  • The system offers a valuable tool for early detection and prevention strategies in cardiology.