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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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Assessment of Ventilation I: Respiratory Rate01:20

Assessment of Ventilation I: Respiratory Rate

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Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
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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.
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Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
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Physiological Control of Respiration01:23

Physiological Control of Respiration

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Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
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Neural Control of Respiration01:18

Neural Control of Respiration

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The neural regulation of respiration is a meticulously coordinated process primarily controlled by the respiratory centers located within the brainstem. These centers, composed of specialized neurons, transmit nerve impulses that control the contraction and relaxation of our respiratory muscles.
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Physical Assessment of the Respiratory Tract II: Inspection01:27

Physical Assessment of the Respiratory Tract II: Inspection

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Physical assessment of the respiratory tract through inspection is a crucial step in understanding the patient's respiratory health. It provides insights into the functioning of the respiratory system, the musculoskeletal structure, and even the patient's nutritional status. This comprehensive approach involves observing several vital aspects: chest configuration, breathing patterns, respiratory rates, skin color, and use of accessory muscles.
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Related Experiment Video

Updated: Feb 20, 2026

Integration of Brain Tissue Saturation Monitoring in Cardiopulmonary Exercise Testing in Patients with Heart Failure
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Integration of Brain Tissue Saturation Monitoring in Cardiopulmonary Exercise Testing in Patients with Heart Failure

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A novel hardware implementation for detecting respiration rate using photoplethysmography.

Joseph Prinable, Peter Jones, Cindy Thamrin

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |October 25, 2017
    PubMed
    Summary

    Continuous breathing monitoring using photoplethysmography (PPG) shows promise for asthma assessment. Altering the LED duty cycle impacts respiratory rate accuracy, with higher duty cycles yielding better results for clinical use.

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    Area of Science:

    • Biomedical Engineering
    • Respiratory Physiology
    • Medical Device Technology

    Background:

    • Asthma poses a significant public health challenge.
    • Continuous breathing monitoring offers a potential method for assessing asthma status.
    • Photoplethysmography (PPG) signal acquisition is explored for respiratory monitoring.

    Purpose of the Study:

    • To present a novel hardware implementation for capturing and storing PPG signals.
    • To investigate the effect of LED duty cycle on respiratory rate accuracy.
    • To evaluate the feasibility of PPG-based respiratory monitoring for clinical applications.

    Main Methods:

    • A novel oximeter hardware was developed for PPG signal capture.
    • The LED duty cycle was varied (5%, 10%, 25%) at a 500 Hz sample rate.
    • Respiration rate derived from PPG was validated against a nasal airflow sensor in 10 healthy volunteers.

    Main Results:

    • A 25% duty cycle achieved a Root Mean Square Error (RMSE) of <2 breaths per minute with the best algorithm.
    • Reducing the duty cycle to 5% increased the RMSE to over 5 breaths per minute.
    • Power consumption varied from 5.4 mW (5% duty cycle) to 15 mW (25% duty cycle).

    Conclusions:

    • A duty cycle of 25% is recommended for clinical respiratory rate assessment due to its accuracy (<2 breaths per minute RMSE).
    • Lower accuracy may be acceptable for non-clinical applications like fitness tracking, enabling reduced power consumption.
    • Further research is needed to establish the utility of this PPG-based system in asthma management.