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Related Concept Videos

Guidelines For Measuring Vital Signs01:19

Guidelines For Measuring Vital Signs

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Following these guidelines can help nurses accurately measure vital signs, assess changes in patient conditions, and provide timely treatment when necessary. Adhering closely to the guidelines ensures the accuracy and reliability of the results.
Before taking a patient's vital signs, a nurse would consider and assess the patient's comfort level and ensure appropriate equipment is available.
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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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Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

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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 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.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
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Assessment of blood pressure in brachial artery(one-step method)01:15

Assessment of blood pressure in brachial artery(one-step method)

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This procedural guide systematically measures blood pressure using an oscillometric digital sphygmomanometer, emphasizing accuracy, patient safety, and comfort.
Prepare for the Procedure:
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Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

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Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
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Related Experiment Video

Updated: May 24, 2025

Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
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Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care

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Wearable Upper Arm SpO2 Sensor for Wellness Monitoring.

Matti T Kinnunen, Mohammad H Behfar, Nuutti Santaniemi

    IEEE Transactions on Bio-Medical Engineering
    |March 3, 2025
    PubMed
    Summary
    This summary is machine-generated.

    A new wearable sensor accurately measures optical heart rate (OHR) and blood oxygen saturation (SpO2) with improved comfort and performance. This innovative design minimizes crosstalk for reliable health monitoring.

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    Area of Science:

    • Biomedical Engineering
    • Wearable Technology
    • Optical Sensing

    Background:

    • Developing accurate and comfortable wearable sensors for physiological monitoring is crucial.
    • Existing sensors often face challenges with signal quality and user comfort.

    Purpose of the Study:

    • To develop and validate a novel wearable sensor for simultaneous optical heart rate (OHR) and blood oxygen saturation (SpO2) measurement.
    • To enhance sensor performance through innovative design and manufacturing techniques.

    Main Methods:

    • Designed and manufactured a wearable sensor utilizing a skin-compatible dispensed lens.
    • Integrated critical optical components (LEDs and photodiode) into a thin monolithic structure for maximal light intensity.
    • Employed light-blocking and transparent dispensed materials to suppress crosstalk between optical components.

    Main Results:

    • Achieved high signal-to-noise ratio (SNR) and amplitude in photoplethysmography (PPG) signals.
    • Demonstrated a blood oxygen saturation (SpO2) root mean square error (RMSE) of 2.61% with a 7-second average analysis.
    • Attained an average heart rate (HR) RMSE of 1.6 ± 1.1% across 25 participants.
    • Ensured user comfort with a small, upper arm-located sensor design.

    Conclusions:

    • The developed sensor provides clinical-grade SpO2 measurements and highly accurate OHR measurements.
    • The sensor is comfortable and easy to wear, suitable for continuous monitoring.
    • The novel dispensing manufacturing method enhances sensor performance and reduces crosstalk.