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Related Concept Videos

Instrumentation Amplifier01:25

Instrumentation Amplifier

An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
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...
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...
Bode Plots Construction01:24

Bode Plots Construction

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):
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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...

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Related Experiment Video

Updated: Jul 6, 2026

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function
05:03

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function

Published on: December 11, 2019

Electromagnetic interference produced by a hearing aid device on electrocardiogram recording.

Adrian Marco Baranchuk1, Jaskaran Kang, Cathy Shaw

  • 1Kingston General Hospital, Queen's University, Ontario, Canada. barancha@kgh.kari.net

Journal of Electrocardiology
|March 21, 2008
PubMed
Summary

This study investigated potential pacemaker interference from a hearing aid accessory. While the pacemaker functioned normally, the MyLink device caused significant electromagnetic interference on ECG recordings when near electrodes.

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Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Electromagnetic Compatibility

Background:

  • An 85-year-old male with atrial fibrillation received a pacemaker.
  • The patient also acquired a MyLink device, an FM transmitter/receiver for hearing aids, due to hearing impairment.

Observation:

  • The MyLink device's neck-loop antenna was positioned near the pacemaker implant site.
  • Pacemaker function was monitored during testing with the MyLink device.

Findings:

  • The MyLink device did not affect the pacemaker's normal operation.
  • However, potent electromagnetic interference was observed on electrocardiogram (ECG) recordings when the MyLink antenna was close to ECG electrodes.

Implications:

  • The study highlights potential electromagnetic interference issues between wireless hearing aid accessories and cardiac electronic devices.
  • Careful placement and testing are crucial to ensure patient safety and accurate diagnostic recordings.