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Electrocardiogram

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...

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Related Experiment Video

Updated: Sep 8, 2025

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

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

Published on: June 9, 2015

Electroretinography.

Julie Shabto¹, Stephen Tsang², Tarun Sharma¹

¹Department of Ophthalmology, Columbia University, New York, NY, USA.

Advances in Experimental Medicine and Biology

|July 30, 2025

Summary

This summary is machine-generated.

The electroretinogram (ERG) objectively measures retinal cell electrical activity. This visual system test aids in diagnosing and monitoring retinal disorders and treatment responses.

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Direct-Coupled Electroretinogram DC-ERG for Recording the Light-Evoked Electrical Responses of the Mouse Retinal Pigment Epithelium

Direct-Coupled Electroretinogram DC-ERG for Recording the Light-Evoked Electrical Responses of the Mouse Retinal Pigment Epithelium

Published on: July 14, 2020

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Last Updated: Sep 8, 2025

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

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Direct-Coupled Electroretinogram DC-ERG for Recording the Light-Evoked Electrical Responses of the Mouse Retinal Pigment Epithelium

Direct-Coupled Electroretinogram DC-ERG for Recording the Light-Evoked Electrical Responses of the Mouse Retinal Pigment Epithelium

Published on: July 14, 2020

Area of Science:

Ophthalmology
Neuroscience
Physiology

Background:

The electroretinogram (ERG) assesses the retina's electrical response to light.
It evaluates function across multiple retinal cell types, including rods, cones, and ganglion cells.

Purpose of the Study:

To highlight the diagnostic and monitoring capabilities of the ERG.
To emphasize its role in assessing visual system function objectively.

Main Methods:

Measuring electrical activity of retinal cells (rods, cones, inner retinal cells, ganglion cells).
Utilizing light stimuli to elicit responses.
Objective assessment of visual system function.

Main Results:

ERG provides objective data on retinal function.
Diagnostic information for inherited and acquired retinal disorders.
Objective measurement of disease progression and treatment response.

Conclusions:

The ERG is a valuable tool for diagnosing retinal disorders.
ERG enables objective monitoring of disease progression and treatment efficacy.
It offers crucial insights into visual system health and function.