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Related Concept Videos

Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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 to...
Electrocardiogram01:29

Electrocardiogram

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 the T...
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

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. When...
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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...
Pulse rhythm01:30

Pulse rhythm

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 muscle...

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Related Experiment Video

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BrainBeats as an Open-Source EEGLAB Plugin to Jointly Analyze EEG and Cardiovascular Signals
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BrainBeats as an Open-Source EEGLAB Plugin to Jointly Analyze EEG and Cardiovascular Signals

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Reference regions for beat-to-beat ECG data.

Kimberly S Crimin1, John W Emerson, Robb J Muirhead

  • 1Department of Biostatistics, VUMC, Nashville, TN 37232, USA. kimberly.crimin@vanderbilt.edu

Pharmaceutical Statistics
|June 23, 2010
PubMed
Summary

This study introduces reference regions for (RR, QT) values from continuous electrocardiogram (ECG) data to better assess arrhythmia risk. This method improves cardiac safety evaluations by establishing reliable baselines for ECG parameters.

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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

Area of Science:

  • Cardiology
  • Pharmacology
  • Biomedical Engineering

Background:

  • The QT interval is a key biomarker for arrhythmia liability, and QT prolongation can lead to drug withdrawal.
  • Traditional QT interval correction methods are inconsistent and do not account for autonomic state changes.
  • Beat-to-beat electrocardiogram (ECG) data acquisition enables continuous monitoring of cardiac parameters.

Purpose of the Study:

  • To motivate the need for (RR, QT) reference regions using beat-to-beat ECG data.
  • To describe a method for constructing these reference regions.
  • To establish reliable baselines for ECG parameters to aid in cardiac risk evaluation.

Main Methods:

  • Utilizing continuous beat-to-beat ECG data to define (RR, QT) value reference regions.
  • Developing a measure of agreement between reference regions to assess data reliability.
  • Applying reference regions to establish baselines for ECG parameters.

Main Results:

  • Demonstrated the utility of (RR, QT) reference regions for characterizing normal cardiac activity.
  • Introduced a novel measure to evaluate the reliability of 12-lead digital Holter data.
  • Illustrated the application of reference regions in cardiac risk assessment using methodological study data.

Conclusions:

  • Reference regions for (RR, QT) values offer a more robust approach to assessing arrhythmia liability compared to traditional methods.
  • This methodology enhances the reliability of ECG data analysis for drug safety and clinical risk evaluation.
  • The proposed method supports the establishment of accurate baselines for ECG parameters, improving cardiac risk assessment.