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Related Concept Videos

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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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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An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
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Assessing a patient's pulse is a fundamental skill in healthcare, but certain situations require special attention:
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Related Experiment Video

Updated: Nov 7, 2025

Intra-cardiac Side-Firing Light Catheter for Monitoring Cellular Metabolism using Transmural Absorbance Spectroscopy of Perfused Mammalian Hearts
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Non-Contact Heart-Rate Measurement Method Using Both Transmitted Wave Extraction and Wavelet Transform.

Zheng Yang1, Kazutaka Mitsui1, Jianqing Wang1

  • 1Nagoya Institute of Technology, Nagoya 466-8555, Japan.

Sensors (Basel, Switzerland)
|April 30, 2021
PubMed
Summary

This study introduces a non-contact method for continuous heart-rate monitoring, even with body movement. The technique achieves 98% accuracy by analyzing microwave signals transmitted through the body, enabling early detection of discomfort.

Keywords:
heart-rate detectionnon-contacttransmitted fieldwavelet transform

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Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Signal Processing

Background:

  • Continuous heart-rate monitoring is crucial for early detection of physical discomfort.
  • Existing methods often struggle with accuracy in the presence of body movement.
  • Non-contact monitoring is desirable for applications like driver monitoring.

Purpose of the Study:

  • To propose a novel non-contact heart-rate measurement method.
  • To enable accurate heart-rate monitoring during body movement.
  • To investigate the use of transmitted electric field strength changes for heart-rate detection.

Main Methods:

  • Utilized microwaves irradiated through the human body to capture internal changes.
  • Employed three receiving sensors to estimate electric field strength transmitted through the heart.
  • Applied stationary wavelet transform to decompose the electric field and mitigate body movement distortion.

Main Results:

  • Successfully estimated electric field strength changes correlated with cardiac diastole and systole.
  • Achieved a high heart-rate estimation accuracy of 98% in verification experiments.
  • Demonstrated robustness against normal body movement effects.

Conclusions:

  • The proposed non-contact microwave-based method offers a promising solution for accurate heart-rate monitoring.
  • This technique effectively reduces motion artifacts, making it suitable for dynamic environments.
  • The findings support the potential for advanced driver monitoring systems and other applications requiring continuous, movement-tolerant heart-rate tracking.