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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

8.3K
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...
8.3K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

2.0K
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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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...
15.4K
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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Brain Waves01:23

Brain Waves

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Brain waves are electrical signals generated by the neurons in the brain, which are regularly monitored to measure mental activities. Brain waves and their frequency ranges can be measured using an electroencephalogram or EEG. There are four main types of brain waves, each with distinct characteristics:
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Related Experiment Video

Updated: Apr 7, 2026

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
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Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

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New micro waveforms firstly recorded on electrocardiogram in human.

Renguang Liu1, Qinghua Chang1, Juan Chen1

  • 1Cardiovascular Institute of the First Affiliated Hospital of Liaoning Medical University in Jinzhou, Liaoning Province, China.

Medical Hypotheses
|July 16, 2015
PubMed
Summary
This summary is machine-generated.

A new electrocardiogram machine identified novel micro-wavelets before and after QRS complexes. These findings may reveal sinus node, atrioventricular conduction system, and ventricular repolarization activity.

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Electrophysiology

Background:

  • The conventional electrocardiogram (ECG) records P-QRS-T waves.
  • Limited understanding of pre-QRS and post-QRS electrical activities in humans.

Purpose of the Study:

  • To identify and characterize micro-wavelets before and after QRS complexes using a novel ECG machine.
  • To correlate these micro-wavelets with specific cardiac electrical activities.

Main Methods:

  • Utilized a new electrocardiogram machine (model PHS-A10) with conventional 12-lead ECG connections.
  • Compared findings in 100 healthy individuals and patients with arrhythmias against conventional ECG.

Main Results:

  • First identification of pre-QRS (P wave, PR segment) and post-QRS (ST segment, T wave upstroke) micro-wavelets in humans.
  • Pre-P wavelets may reflect sinus node activity; pre-QRS micro-wavelets may relate to atrioventricular conduction system potentials.
  • Post-QRS wavelets potentially indicate ventricular repolarization phases 2 and 3.

Conclusions:

  • The new ECG machine enables noninvasive tracing of atrioventricular node and His bundle potentials.
  • This technology aids in differentiating wide QRS origins and locating atrioventricular blocks.
  • Provides new insights into ventricular repolarization changes.