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Related Concept Videos

Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

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Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is...
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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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Special considerations while measuring pulse01:13

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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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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.
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Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
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Assessing Blood pressure using a doppler ultrasound01:19

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To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
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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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Related Experiment Video

Updated: Dec 10, 2025

Software for Analysis of Heart Rate and Blood Pressure Time-series Data from the Valsalva Maneuver
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Published on: June 27, 2025

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Photoplethysmographic Waveform and Pulse Rate Variability Analysis in Hyperbaric Environments.

Maria Dolores Pelaez-Coca, Alberto Hernando, Maria Teresa Lozano

    IEEE Journal of Biomedical and Health Informatics
    |September 2, 2020
    PubMed
    Summary

    Exposure to hyperbaric environments alters pulse photoplethysmogram (PPG) morphology, indicating peripheral sympathetic activation. However, Pulse Rate Variability (PRV) analysis reveals increased parasympathetic activity, suggesting complex Autonomic Nervous System (ANS) responses.

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    Area of Science:

    • Physiological responses to extreme environments
    • Cardiovascular system dynamics
    • Biomedical signal analysis

    Background:

    • Hyperbaric environments can significantly impact physiological functions.
    • Understanding Autonomic Nervous System (ANS) responses is crucial in extreme conditions.
    • Photoplethysmogram (PPG) signals offer insights into cardiovascular changes.

    Purpose of the Study:

    • To investigate alterations in PPG signal morphology under hyperbaric conditions.
    • To analyze Pulse Rate Variability (PRV) for characterizing Autonomic Nervous System (ANS) response.
    • To assess the suitability of PPG for monitoring physiological changes in hyperbaric settings.

    Main Methods:

    • 28 volunteers were exposed to sequential hyperbaric stages (1-5 atm).
    • Nineteen morphological parameters of the PPG signal were analyzed.
    • Time and frequency domain parameters of PRV were computed.

    Main Results:

    • Significant widening of pulse width and increased PPG area were observed with increasing pressure.
    • PPG morphology changes suggest peripheral vasoconstriction and sympathetic activation.
    • PRV analysis indicated augmented parasympathetic activity and reduced sympathetic response parameters.

    Conclusions:

    • PPG morphology changes reflect peripheral sympathetic activation in hyperbaric environments.
    • Conflicting signals from PPG morphology and PRV analysis suggest a complex ANS response.
    • PPG is a suitable tool for studying physiological responses in hyperbaric conditions, even in wet environments.