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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

7.3K
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...
7.3K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

1.8K
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...
1.8K
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

17.1K
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....
17.1K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

789
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...
789
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

14.1K
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...
14.1K
Cardiac Action Potential01:30

Cardiac Action Potential

8.1K
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
8.1K

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Related Experiment Video

Updated: Mar 14, 2026

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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Short ECG segments predict defibrillation outcome using quantitative waveform measures.

Jason Coult1, Lawrence Sherman2, Heemun Kwok3

  • 1Department of Bioengineering, University of Washington, Seattle, WA, USA; Center for Progress in Resuscitation, University of Washington, Seattle, WA, USA.

Resuscitation
|November 7, 2016
PubMed
Summary
This summary is machine-generated.

Quantitative ECG measures can predict defibrillation success even with brief, artifact-free epochs. This finding supports using these waveform measures in CPR algorithms to minimize interruptions and improve survival.

Keywords:
Amplitude spectrum areaAutomated external defibrillatorDefibrillationElectrocardiogramQuantitative waveform measuresVentricular fibrillation

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Area of Science:

  • Cardiology
  • Emergency Medicine
  • Biomedical Engineering

Background:

  • Quantitative electrocardiogram (ECG) waveform measures predict ventricular fibrillation (VF) defibrillation outcomes.
  • Calculating these measures requires an ECG free of chest compression artifact, necessitating CPR pauses.
  • CPR pauses can negatively impact patient survival rates.

Purpose of the Study:

  • To investigate the relationship between the length of the CPR-free epoch and the predictive ability of VF ECG waveform measures.
  • To determine if shorter ECG epochs can reliably predict defibrillation outcomes.

Main Methods:

  • Retrospective analysis of out-of-hospital VF cardiac arrest patients (n=442).
  • Calculation of Amplitude Spectrum Area (AMSA) and Median Slope (MS) using ECG epochs from 5s down to 0.2s.
  • Evaluation of predictive ability for return of organized rhythm (ROR) and neurologically-intact survival using Area Under the Curve (AUC).

Main Results:

  • AMSA performance significantly declined with epochs ≤0.2s for ROR and ≤0.6s for survival.
  • MS performance significantly declined with epochs ≤0.8s for ROR and ≤1.6s for survival.
  • Both measures maintained predictive ability with brief epochs.

Conclusions:

  • Quantitative waveform measures can predict defibrillation outcomes using very brief ECG epochs.
  • This characteristic may allow their integration into resuscitation algorithms to minimize CPR interruptions.
  • Enables potential use of waveform analysis without prolonged CPR pauses.