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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.
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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.
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An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
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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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Updated: Sep 27, 2025

Noninvasive Electrocardiography in the Perinatal Mouse
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Frequency-Based Maternal Electrocardiogram Attenuation for Fetal Electrocardiogram Analysis.

Pooneh Roshanitabrizi1, Anita Krishnan2, Catherine Ingbar3

  • 1Sheikh Zayed Institute for Pediatric Surgical Innovation, Children's National Hospital, 111 Michigan Ave. NW, Washington, DC, 20010, USA. proshnani2@childrensnational.org.

Annals of Biomedical Engineering
|April 11, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces an automatic method to improve fetal electrocardiogram (ECG) analysis by removing maternal ECG interference. The new frequency-domain approach enhances fetal ECG extraction for better high-risk pregnancy management.

Keywords:
Abdominal electrocardiogramFetal electrocardiogramMaternal electrocardiogramSpectral coherence

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Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Signal Processing

Background:

  • Accurate fetal electrocardiogram (ECG) analysis and cardiac time intervals (CTIs) are vital for managing high-risk pregnancies.
  • Existing systems struggle with consistent and accurate fetal ECG measurements due to maternal ECG interference.

Purpose of the Study:

  • To develop an automatic approach for attenuating maternal ECG in the frequency domain to enhance fetal ECG extraction.
  • To improve the measurement of cardiac time intervals (CTIs) from fetal ECG signals.

Main Methods:

  • A novel frequency-domain method to identify and subtract coherent maternal ECG components from abdominal ECG.
  • Utilized inverse Fourier transform for time-domain conversion and averaged multiple beats to refine fetal ECG.
  • Clinical validation involved blinded assessment by fetal cardiologists using a grading system.

Main Results:

  • The proposed frequency-based method achieved a significantly higher mean grade (3.49 ± 1.22) compared to adaptive interference cancellation (2.64 ± 1.26, p < 0.001).
  • Evaluated on synthetic, public, and 37 clinical datasets, demonstrating superior fetal ECG quality.
  • Clinician assessment confirmed the effectiveness of the frequency-domain fetal ECG extraction technique.

Conclusions:

  • The developed automatic frequency-domain method effectively extracts fetal ECG and enhances CTI measurements.
  • This technique shows significant potential for improving clinical management of high-risk pregnancies.
  • Offers a superior alternative to existing time-based methods for fetal ECG analysis.