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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...
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...
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
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...
Cardiac Action Potential01:30

Cardiac Action Potential

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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Related Experiment Video

Updated: Jul 16, 2026

Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
09:52

Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts

Published on: November 7, 2019

F-waves--physiology and clinical uses.

Morris A Fisher1

  • 1Hines VAH and Loyola University Chicago Stritch School of Medicine, Chicago, IL, USA. morris.fisher@med.va.gov

Thescientificworldjournal
|March 6, 2007
PubMed
Summary

F-wave analysis in neurophysiology requires understanding their variable nature. Correctly analyzed, F-waves are sensitive tools for diagnosing polyneuropathies and other neurological disorders.

Area of Science:

  • Clinical Neurophysiology
  • Neuromuscular Medicine

Background:

  • F-waves are low-amplitude responses from motoneuron antidromic activation.
  • Their inherent variability in latency, amplitude, and configuration necessitates careful analysis.

Purpose of the Study:

  • To review the physiology and characteristics of F-waves.
  • To highlight the requirements for accurate F-wave analysis in clinical neurophysiology.
  • To discuss the diagnostic utility of F-waves in various neurological conditions.

Main Methods:

  • Review of existing literature on F-wave physiology and clinical applications.
  • Discussion of parameters for F-wave analysis, including number of responses, evaluated parameters, and muscle selection.

Main Results:

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Preclinical Cardiac Electrophysiology Assessment by Dual Voltage and Calcium Optical Mapping of Human Organotypic Cardiac Slices

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In Vivo Surface Electrocardiography for Adult Zebrafish
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In Vivo Surface Electrocardiography for Adult Zebrafish

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Related Experiment Videos

Last Updated: Jul 16, 2026

Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
09:52

Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts

Published on: November 7, 2019

Preclinical Cardiac Electrophysiology Assessment by Dual Voltage and Calcium Optical Mapping of Human Organotypic Cardiac Slices
09:35

Preclinical Cardiac Electrophysiology Assessment by Dual Voltage and Calcium Optical Mapping of Human Organotypic Cardiac Slices

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In Vivo Surface Electrocardiography for Adult Zebrafish
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In Vivo Surface Electrocardiography for Adult Zebrafish

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  • Proper F-wave analysis requires understanding their inherent variability and specific recording/evaluation criteria.
  • F-waves are highly sensitive and reliable for diagnosing polyneuropathies.
  • F-waves can detect focal proximal nerve dysfunction and lumbosacral radiculopathies.
  • F-waves offer physiological insights into central nervous system disorders.

Conclusions:

  • Correct F-wave analysis is crucial for resolving controversies and maximizing their clinical utility.
  • F-waves represent a sensitive and reliable nerve conduction study for multiple neurological conditions.
  • Understanding F-wave characteristics enhances their role in clinical neurophysiology.