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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

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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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Pulse rhythm01:30

Pulse rhythm

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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Electrocardiogram Fundamentals01:28

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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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Holter Monitor: 24-Hour Monitoring01:23

Holter Monitor: 24-Hour Monitoring

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Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...
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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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Instrumentation Amplifier01:25

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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...
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Updated: Nov 3, 2025

Bidirectional Electrical and Optoelectronic Interfaces in Healthy and Ischemic Ex Vivo Rat Hearts
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Novel Stable Capacitive Electrocardiogram Measurement System.

Chi-Chun Chen1, Shu-Yu Lin1, Wen-Ying Chang2

  • 1Department of Electronic Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan.

Sensors (Basel, Switzerland)
|June 2, 2021
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Summary
This summary is machine-generated.

This study introduces a novel noncontact electrocardiogram (ECG) system, enhancing signal stability and accuracy for everyday use. The new capacitive sensing electrodes offer a comfortable alternative to traditional ECG pads.

Keywords:
noncontact electrocardiogramoptimal input resistanceoptimal voltage divider feedbacksurface guard ring

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Area of Science:

  • Biomedical Engineering
  • Signal Processing

Background:

  • Conventional electrocardiogram (ECG) measurements rely on skin-contact electrodes, which can be uncomfortable and prone to motion artifacts.
  • Existing noncontact ECG methods often struggle with environmental noise and signal distortion.

Purpose of the Study:

  • To develop and validate a noncontact ECG measurement system using capacitive sensing electrodes.
  • To improve the stability and accuracy of ECG measurements compared to existing noncontact methods.

Main Methods:

  • Designed novel noncontact electrodes incorporating surface and ground guard rings, optimal input resistance, and voltage divider feedback.
  • Integrated a capacitive driven right leg circuit to minimize common-mode interference.
  • Simulated environmental and motion artifact interference to test system performance.

Main Results:

  • The proposed noncontact electrodes demonstrated superior stability in the presence of environmental and motion artifact interference compared to capacitive ECG electrodes.
  • ECG signals measured by the system showed 98.6% similarity in R-R intervals to those obtained from contact ECG systems.
  • Simulated gain analysis confirmed optimal design parameters for enhanced signal acquisition.

Conclusions:

  • The developed noncontact ECG measurement system offers a stable and accurate alternative to conventional methods.
  • Capacitive sensing technology is a viable approach for comfortable, everyday ECG monitoring.
  • The system's high similarity to contact ECGs suggests its potential for widespread clinical and personal use.