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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

7.1K
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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Bode Plots Construction01:24

Bode Plots Construction

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The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):
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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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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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Electrophoresis: Overview01:20

Electrophoresis: Overview

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Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
There...
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Voltammograms: Overview01:16

Voltammograms: Overview

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Voltammograms are current plots as a function of applied potential, offering insights into electrochemical systems. The shape of a voltammogram depends on how the current is measured and whether convection (heat transfer by fluid movement) is present or absent.
Shapes of Voltammograms
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Related Experiment Video

Updated: Mar 2, 2026

Using the Electroretinogram to Assess Function in the Rodent Retina and the Protective Effects of Remote Limb Ischemic Preconditioning
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Using the Electroretinogram to Assess Function in the Rodent Retina and the Protective Effects of Remote Limb Ischemic Preconditioning

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Electrosigmoidogram, electrorectogram and their relation.

Ahmed Shafik1

  • 12 Talaat Harb Street Cairo, Egypt, shafik@ahmedshafik.com.

Frontiers in Bioscience : a Journal and Virtual Library
|May 9, 2017
PubMed
Summary

Rectal and sigmoid colon electrical activity (electrosigmoidogram and electrorectogram) were analyzed. Balloon distention impacted electrical signals differently in each region, suggesting distinct "mass-type" movements.

Area of Science:

  • Gastroenterology
  • Neurogastroenterology
  • Colorectal Physiology

Background:

  • Understanding the electromechanical activity of the sigmoid colon and rectum is crucial for diagnosing motility disorders.
  • The relationship between sigmoid colon and rectal electrical activity is not fully elucidated.

Purpose of the Study:

  • To investigate the electrical activity of the sigmoid colon (electrosigmoidogram, ESG) and rectum (electrorectogram, ERG).
  • To determine the relationship between ESG and ERG.
  • To assess the impact of localized distention on colonic and rectal electrical activity.

Main Methods:

  • Recorded electrosigmoidograms and electrorectograms in nine patients.
  • Measured pacesetter potential (PP) frequency, amplitude, and velocity.

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  • Utilized balloon distention in the sigmoid colon and rectum to simulate physiological stimuli.

    • Main Results:

    • Rectal PP frequency and amplitude were significantly higher than those of the sigmoid colon.
    • Balloon distention proximally increased PP and action potential (AP) activity, while distally decreasing it.
    • Sigmoid colon distention did not alter rectal electromechanical activity, and vice versa.

    Conclusions:

    • The sigmoid colon and rectum exhibit distinct electromechanical properties.
    • Colorectal motility appears to be of the "mass type", characterized by localized responses to distention.
    • Further research is needed to fully understand the implications for colorectal function and dysfunction.