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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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Pulse Oximetry01:24

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Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
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Special considerations while measuring pulse01:13

Special considerations while measuring pulse

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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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Factors Influencing Heart Rate01:30

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The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
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Equipments Used To Measure Blood Pressure01:30

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Direct Method
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
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Pulse amplitude and quality01:17

Pulse amplitude and quality

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Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
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Related Experiment Video

Updated: Jan 10, 2026

Author Spotlight: Advancing the Study of Brain-Heart Interplay with a Comprehensive EEGLAB Plugin for Multimodal Signal Analysis
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Butterworth Filtering at 500 Hz Optimizes PPG-Based Heart Rate Variability Analysis for Wearable Devices: A

Nagima Abdrasulova1, Milana Aleksanyan1, Min Ju Kim1

  • 1Division of Software, Hallym University, 1 Hallymdaehak-gil, Chuncheon 24252, Gangwon-do, Republic of Korea.

Sensors (Basel, Switzerland)
|November 27, 2025
PubMed
Summary

Optimizing photoplethysmography (PPG) signal processing with Butterworth filters at 500 Hz provides reliable heart rate variability (HRV) monitoring on wearable devices, balancing accuracy and efficiency.

Keywords:
Butterworth filterIIR filterselliptic filterheart rate variabilityphotoplethysmographysignal processing

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Area of Science:

  • Biomedical Engineering
  • Signal Processing
  • Wearable Technology

Background:

  • Photoplethysmography (PPG) offers a cost-effective method for heart rate variability (HRV) analysis, crucial for autonomic nervous system monitoring.
  • Wearable devices require efficient signal processing for accurate HRV assessment using PPG, often limited by microcontroller capabilities.

Purpose of the Study:

  • To optimize digital filter selection and sampling frequency for PPG-based HRV analysis on low-power microcontrollers.
  • To compare the performance of Butterworth and Elliptic Infinite Impulse Response (IIR) bandpass filters for zero-phase HRV signal processing.

Main Methods:

  • Evaluated 4th-order equivalent Butterworth and Elliptic IIR bandpass filters (0.8-20 Hz, zero-phase) at 1000, 500, and 250 Hz sampling rates.
  • Analyzed paired PPG-ECG recordings from 10 healthy adults using Lin's concordance correlation coefficient (CCC), ±5% equivalence testing (TOST), and Passing-Bablok regression (PBR).
  • Assessed key HRV frequency domain components: ln HF, ln LF, and ln VLF.

Main Results:

  • Butterworth filtering at 500 Hz demonstrated high agreement with ECG standards (CCC ≥0.94), meeting equivalence criteria and showing minimal bias (PBR slopes near 1, intercepts near 0).
  • This configuration halved computational load compared to higher sampling rates without compromising accuracy.
  • Elliptic filters, particularly at 250 Hz, showed significantly lower concordance (CCC ≈ 0.64) and failed equivalence testing due to phase distortion and ripple effects.

Conclusions:

  • Zero-phase Butterworth filtering at a sampling rate of ≥500 Hz represents the optimal strategy for reliable PPG-HRV monitoring on low-power wearable devices.
  • This approach balances signal fidelity, robustness against artifacts, and computational efficiency.
  • Preliminary findings provide design parameters for future large-scale clinical validation of PPG-based HRV monitoring systems.