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Related Concept Videos

Pulse Oximetry01:24

Pulse Oximetry

382
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...
382
Pulse rhythm01:30

Pulse rhythm

893
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.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
893
Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

644
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...
644
Holter Monitor: 24-Hour Monitoring01:23

Holter Monitor: 24-Hour Monitoring

134
Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...
134
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

329
In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
329
Special considerations while measuring pulse01:13

Special considerations while measuring pulse

639
Assessing a patient's pulse is a fundamental skill in healthcare, but certain situations require special attention:
639

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Related Experiment Video

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Integration of Brain Tissue Saturation Monitoring in Cardiopulmonary Exercise Testing in Patients with Heart Failure
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A Sparse Sampling Sensor Front-End IC for Low Power Continuous SpO 2 & HR Monitoring.

Sina Faraji Alamouti, Jasmine Jan, Cem Yalcin

    IEEE Transactions on Biomedical Circuits and Systems
    |November 23, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a low-power sensor IC for continuous photoplethysmography (PPG) monitoring. Its novel sparse sampling algorithm reduces power consumption by 70% for vital sign tracking, enhancing device battery life.

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    Area of Science:

    • Biomedical Engineering
    • Integrated Circuit Design
    • Wearable Health Technology

    Background:

    • Photoplethysmography (PPG) sensors are crucial for monitoring vital signs like heart rate (HR) and blood oxygen saturation (SpO2).
    • Conventional PPG systems face challenges with high power consumption, particularly from LEDs, limiting continuous operation and battery life, especially with flexible organic devices.
    • Organic photodetectors (PDs) offer advantages in conformality and cost but increase power demands due to parasitic capacitances and higher drive voltages.

    Purpose of the Study:

    • To develop a low-power sensor integrated circuit (IC) for continuous SpO2 and HR monitoring.
    • To significantly reduce system power consumption in PPG sensors while maintaining measurement accuracy.
    • To design a versatile frontend compatible with both silicon and organic photodetectors.

    Main Methods:

    • Implementation of an on-chip, reconstruction-free sparse sampling algorithm to minimize power usage.
    • Design of a sensor IC using a 40 nm HV CMOS process, optimizing for small footprint and low power.
    • Frontend compatibility designed for a broad range of photodetectors, including those with high parasitic capacitances (up to 10 nF).

    Main Results:

    • Achieved a system power consumption reduction of approximately 70% in sparse sampling mode compared to continuous operation.
    • The sensor IC consumes 49.7 μW in continuous mode and 15.2 μW in sparse sampling mode.
    • Demonstrated in vivo performance with mean absolute errors of less than 1 bpm for HR and 1% for SpO2, validated against a clinical-grade reference.

    Conclusions:

    • The developed sensor IC effectively reduces power consumption for continuous PPG-based vital sign monitoring.
    • The sparse sampling algorithm maintains high accuracy, making it suitable for battery-powered health devices.
    • The design's compatibility with various photodetector technologies facilitates broader adoption in wearable and clinical applications.