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Related Concept Videos

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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Pulse01:16

Pulse

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When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
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Pulse01:05

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The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
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Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Pulse Oximetry01:24

Pulse Oximetry

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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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Regulation of Pulse01:20

Regulation of Pulse

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Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.
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Related Experiment Video

Updated: Jan 25, 2026

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice
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Baroreflex Sensitivity Measured by Pulse Photoplethysmography.

Jesús Lázaro1,2,3, Eduardo Gil2,3, Michele Orini4

  • 1Department of Biomedical Engineering, University of Connecticut, Storrs, CT, United States.

Frontiers in Neuroscience
|May 7, 2019
PubMed
Summary

New methods assess baroreflex sensitivity (BRS) using only photoplethysmography (PPG) signals. These PPG-based surrogates show high correlation with traditional methods, enabling BRS assessment during tilt tests.

Keywords:
alpha indexautonomic nervous systembaroreflexblood pressurecardiovascular assessmentphotoplethysmography

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Area of Science:

  • Biomedical Engineering
  • Physiology
  • Cardiovascular Research

Background:

  • Baroreflex sensitivity (BRS) is crucial for cardiovascular regulation.
  • Traditional BRS assessment often requires invasive blood pressure monitoring.
  • Developing non-invasive BRS assessment methods is a significant research goal.

Purpose of the Study:

  • To introduce and evaluate novel methods for assessing BRS using solely photoplethysmography (PPG) signals.
  • To compare the performance of PPG-based BRS surrogates against a gold standard method.
  • To determine the feasibility of using PPG for BRS assessment during physiological challenges like tilt table tests.

Main Methods:

  • Proposed novel BRS assessment methods based on surrogates of the alpha index.
  • Utilized pulse-to-pulse interval variability (PPV) as a surrogate for RR interval variability (RRV).
  • Employed morphological features of PPG pulses, specifically pulse up-slope (PUS), as surrogates for systolic arterial pressure variability (SAPV).
  • Applied time-frequency analysis and coherence to assess BRS in low (LF) and high (HF) frequency bands.
  • Validated methods against conventional alpha index derived from ECG and BP signals in 17 healthy subjects during a tilt table test.

Main Results:

  • The PPG-based alpha index surrogate using PPV and PUS demonstrated high correlations with the conventional alpha index (0.74 for LF, 0.81 for HF).
  • The proposed method successfully identified significant differences in BRS between rest and tilt stages, consistent with the conventional method.
  • Pulse up-slope (PUS) emerged as the most effective PPG morphological feature for surrogate SAPV estimation.

Conclusions:

  • Non-invasive BRS assessment is achievable with high accuracy using only PPG signals.
  • PPG-based surrogates, particularly PPV and PUS, offer a promising alternative to traditional BRS measurement techniques.
  • These findings support the use of PPG for monitoring cardiovascular autonomic function in various clinical and research settings.