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Electrocardiogram Fundamentals

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...

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Author Spotlight: Epimysial Electrode Fabrication and Testing in ACL Injury Studies

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Needle electromyography: Basic concepts.

Devon I Rubin¹

¹Department of Neurology, Mayo Clinic, Jacksonville, FL, United States.

Handbook of Clinical Neurology

|July 7, 2019

Summary

This summary is machine-generated.

Needle electromyography (EMG) records muscle electrical signals using a needle electrode. This technique analyzes muscle fiber and motor unit function, with various analysis methods available.

Keywords:

Complications Concentric Electromyography Monopolar Needle electrodes Pain Quantitation Semiquantitation Sensitivity Technique Waveforms

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Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Published on: September 13, 2015

Area of Science:

Neurology
Physiology
Biomedical Engineering

Background:

Needle electromyography (EMG) is a diagnostic tool for assessing neuromuscular disorders.
It involves recording electrical activity from muscles using a needle electrode.

Purpose of the Study:

To provide a comprehensive overview of needle EMG techniques.
To discuss factors influencing signal recording and analysis methods.

Main Methods:

Insertion of a needle electrode into the muscle.
Recording and amplification of electrical signals from resting and contracting muscle fibers.
Interpretation of signals to evaluate muscle fiber and motor unit function.

Main Results:

Various factors, including electrode type and equipment settings, affect signal quality.
Both semiquantitative and quantitative analysis methods exist, each with distinct pros and cons.
Needle EMG is generally safe, with potential risks like pain, bleeding, and pneumothorax.

Conclusions:

Needle EMG is a valuable technique for neuromuscular assessment.
Understanding influencing factors and analysis methods is crucial for accurate interpretation.
Awareness of potential risks is important for patient safety.