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Related Concept Videos

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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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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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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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...
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Related Experiment Video

Updated: Aug 13, 2025

Recording Brain Activity with Ear-Electroencephalography
09:58

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[Basic Principles of Electroencephalogram].

Naotaka Usui1

  • 1Department of Neurosurgery, National Epilepsy Center, NHO Shizuoka Institute of Epilepsy and Neurological Disorders.

No Shinkei Geka. Neurological Surgery
|January 22, 2023
PubMed
Summary
This summary is machine-generated.

Accurate interpretation of electroencephalogram (EEG) signals, particularly interictal epileptiform discharges (IEDs), is crucial for epilepsy diagnosis. Understanding normal waveforms, variants, and artifacts prevents misdiagnosis and ensures correct patient management.

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Area of Science:

  • Neuroscience
  • Clinical Neurophysiology

Context:

  • Electroencephalogram (EEG) signals originate from cortical pyramidal cell postsynaptic potentials.
  • Interictal epileptiform discharges (IEDs) are generated by paroxysmal depolarization shifts (PDS) and exhibit specific polarity.
  • Accurate EEG interpretation requires knowledge of normal waveforms, variants, and artifacts.

Purpose:

  • To emphasize the critical need for accurate identification of IEDs to prevent misdiagnosis.
  • To highlight the importance of established criteria, such as those from the International Federation of Clinical Neurophysiology, for IED identification.
  • To underscore the role of long-term video-EEG in presurgical evaluations and differential diagnosis.

Summary:

  • IEDs are negative towards the cortical surface and positive towards the white matter.
  • Overinterpretation of EEG is a common cause of misdiagnosis.
  • Long-term video-EEG, combined with clinical history and symptomatology, is vital for accurate epilepsy diagnosis and localization.

Impact:

  • Improved diagnostic accuracy in epilepsy.
  • Reduced misdiagnosis rates due to EEG overinterpretation.
  • Enhanced presurgical evaluation and differential diagnosis of epileptic and non-epileptic events.