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Related Concept Videos

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

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 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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ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
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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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Assessment of apical radial pulse01:25

Assessment of apical radial pulse

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Apical-Radial (A-R) Pulse Assessment
The A-R pulse assessment involves simultaneous evaluation of the apical and radial pulses. When the apical and radial pulse rates vary, this assessment helps identify a pulse deficit.
Pre-Procedural Preparation
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Related Experiment Video

Updated: Jul 5, 2025

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

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Representative QRS loop of the VCG record evaluation.

Jan Kijonka1,2, Petr Vavra2, Marek Penhaker1

  • 1Department of Cybernetics and Biomedical Engineering, Faculty of Electrical Engineering and Computer Science, VSB-Technical University of Ostrava, Ostrava, Czechia.

Frontiers in Physiology
|January 19, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces an algorithm to create a representative QRS loop from vectorcardiogram (VCG) records. The method effectively reduces beat-to-beat variability, aiding in VCG analysis and classification.

Keywords:
ECGQRS detectionQRS loop alignmentVCGdigital filteringintra-individualityisoelectric line detectionrepresentative QRS loop

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Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Signal Processing

Background:

  • Vectorcardiography (VCG) provides valuable insights into cardiac electrical activity.
  • Preprocessing VCG signals is crucial for accurate analysis and interpretation.
  • Existing methods may struggle with noise and beat-to-beat variability in VCG data.

Purpose of the Study:

  • To develop and evaluate an algorithm for preprocessing VCG records.
  • To generate a representative QRS loop from VCG data.
  • To improve the accuracy of VCG analysis for clinical applications.

Main Methods:

  • Digital filtering for noise reduction.
  • Wavelet-based detection of ECG fiducial points and PQ intervals.
  • Spatial alignment, time synchronization (RMSE minimization), and ectopic QRS elimination.
  • Calculation of a representative QRS loop as the average of all QRS loops.

Main Results:

  • The algorithm was evaluated on 161 VCG records from healthy subjects and patients with myocardial infarction and bundle branch block.
  • Maximum relative deviation ranged from 12.2% (healthy) to 19.3% (myocardial infarction).
  • Morphologic variability was significantly reduced post-synchronization and ectopic beat elimination (by factors of 0.36-0.41).

Conclusions:

  • The proposed algorithm successfully generates a representative QRS loop from VCG records.
  • This representative loop facilitates visualization, comparison, and automated classification of VCG data.
  • The method offers a robust approach to VCG signal preprocessing for clinical diagnostics.