Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

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...
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...
Generator Voltage Control01:21

Generator Voltage Control

Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
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...
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Intrathecal drug delivery in the era of nanomedicine.

Advanced drug delivery reviews·2020
Same author

Cathinone increases body temperature, enhances locomotor activity, and induces striatal c-fos expression in the Siberian hamster.

Neuroscience letters·2013
Same author

Increased responses to the actions of fibroblast growth factor 21 on energy balance and body weight in a seasonal model of adiposity.

Journal of neuroendocrinology·2012
Same author

Short-days induce weight loss in Siberian hamsters despite overexpression of the agouti-related peptide gene.

Journal of neuroendocrinology·2010
Same author

Oesophageal techniques for deriving the lung dynamics of quietly breathing sheep.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference·2009
Same author

Rationale for and study design of the sulodexide trials in Type 2 diabetic, hypertensive patients with microalbuminuria or overt nephropathy.

Diabetic medicine : a journal of the British Diabetic Association·2007
Same journal

A comparison between EPSON V700 and EPSON V800 scanners for film dosimetry.

Australasian physical & engineering sciences in medicine·2020
Same journal

Nanodosimetric understanding to the dependence of the relationship between dose-averaged lineal energy on nanoscale and LET on ion species.

Australasian physical & engineering sciences in medicine·2020
Same journal

Schizophrenia diagnosis using innovative EEG feature-level fusion schemes.

Australasian physical & engineering sciences in medicine·2020
Same journal

Force decoding using local field potentials in primary motor cortex: PLS or Kalman filter regression?

Australasian physical & engineering sciences in medicine·2020
Same journal

EPSM 2019, Engineering and Physical Sciences in Medicine : 28-30 October 2019, Perth, Australia.

Australasian physical & engineering sciences in medicine·2020
Same journal

New name: Physical and Engineering Sciences in Medicine.

Australasian physical & engineering sciences in medicine·2020
See all related articles

Related Experiment Video

Updated: Jun 19, 2026

Equipment Setup and Artifact Removal for Simultaneous Electroencephalogram and Functional Magnetic Resonance Imaging for Clinical Review in Epilepsy
10:23

Equipment Setup and Artifact Removal for Simultaneous Electroencephalogram and Functional Magnetic Resonance Imaging for Clinical Review in Epilepsy

Published on: June 23, 2023

ECG interference suppressed using a harmonic generator.

W J Davie1, M J Fowler, E Koumoundouros

  • 1Department of Clinical Engineering, Royal Melbourne Hospital, Melbourne Victoria, Australia. jack.davie@mh.org.au

Australasian Physical & Engineering Sciences in Medicine
|October 31, 2009
PubMed
Summary
This summary is machine-generated.

Electromagnetic field interference disrupted ECG monitoring at a new hospital ED. Introducing anti-phase third harmonic currents successfully suppressed this interference, ensuring reliable patient monitoring.

More Related Videos

Bidirectional Electrical and Optoelectronic Interfaces in Healthy and Ischemic Ex Vivo Rat Hearts
08:33

Bidirectional Electrical and Optoelectronic Interfaces in Healthy and Ischemic Ex Vivo Rat Hearts

Published on: July 18, 2025

Isolation, Culture, and Functional Characterization of Adult Mouse Cardiomyoctyes
12:49

Isolation, Culture, and Functional Characterization of Adult Mouse Cardiomyoctyes

Published on: September 24, 2013

Related Experiment Videos

Last Updated: Jun 19, 2026

Equipment Setup and Artifact Removal for Simultaneous Electroencephalogram and Functional Magnetic Resonance Imaging for Clinical Review in Epilepsy
10:23

Equipment Setup and Artifact Removal for Simultaneous Electroencephalogram and Functional Magnetic Resonance Imaging for Clinical Review in Epilepsy

Published on: June 23, 2023

Bidirectional Electrical and Optoelectronic Interfaces in Healthy and Ischemic Ex Vivo Rat Hearts
08:33

Bidirectional Electrical and Optoelectronic Interfaces in Healthy and Ischemic Ex Vivo Rat Hearts

Published on: July 18, 2025

Isolation, Culture, and Functional Characterization of Adult Mouse Cardiomyoctyes
12:49

Isolation, Culture, and Functional Characterization of Adult Mouse Cardiomyoctyes

Published on: September 24, 2013

Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Medical Physics

Background:

  • Non-linear loading of utility power supplies can generate electromagnetic field (EMF) interference.
  • Electromagnetic interference (EMI) poses a significant risk to sensitive medical equipment, such as electrocardiograph (ECG) monitors.
  • Standard shielding methods, like Mu-metal, may not fully mitigate EMF interference from specific harmonic currents.

Purpose of the Study:

  • To investigate the source of severe EMF interference affecting ECG monitoring in a new Emergency Department (ED).
  • To identify the specific harmonic currents responsible for disrupting ECG recordings.
  • To develop and test a method for suppressing the identified EMF interference.

Main Methods:

  • Field investigations were conducted within the new Emergency Department (ED) at the Royal Melbourne Hospital (RMH).
  • Electromagnetic field (EMF) levels and their correlation with ECG monitoring disruptions were analyzed.
  • The primary source of interference was identified as 3rd harmonic currents in the main power feed.
  • A novel suppression technique involving the introduction of anti-phase third harmonic currents was implemented.

Main Results:

  • Significant electromagnetic field (EMF) interference was detected, compromising electrocardiograph (ECG) monitoring and recordings.
  • The interference originated from 3rd harmonic currents present in the hospital's main power supply cable.
  • The implementation of anti-phase third harmonic current injection successfully suppressed the disruptive EMF interference.
  • ECG monitoring and recording capabilities were restored to normal operational levels.

Conclusions:

  • 3rd harmonic currents in power supplies are a critical source of electromagnetic interference (EMI) affecting sensitive medical equipment.
  • Active cancellation using anti-phase harmonic currents is an effective method for mitigating specific EMF interference issues.
  • Ensuring electromagnetic compatibility is crucial for the reliable operation of critical care environments like Emergency Departments (EDs).