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Assessing Blood pressure using a doppler ultrasound01:19

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Measuring blood pressure is a fundamental skill in healthcare that aids in diagnosing and monitoring hypertension and other cardiovascular conditions. An aneroid sphygmomanometer, commonly used in clinical settings, offers a manual and precise method for blood pressure measurement. The technique for using this instrument involves specific steps that must be carefully executed to ensure accuracy. The following detailed description outlines a two-step technique for assessing blood pressure using...
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Updated: Aug 7, 2025

Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
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Soft wireless sternal patch to detect systemic vasoconstriction using photoplethysmography.

Nathan Zavanelli1,2, Sung Hoon Lee2,3, Matthew Guess1,2

  • 1George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30024, USA.

Iscience
|March 7, 2023
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A new wireless sternal patch effectively detects vasoconstriction, a key indicator of blood pressure and health conditions. This wearable technology offers a novel, reliable method for real-time physiological monitoring.

Keywords:
BioelectronicsBiological sciencesBiotechnologyEngineeringHealth sciences

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Area of Science:

  • Biomedical Engineering
  • Physiological Monitoring
  • Wearable Technology

Background:

  • Vasoconstriction is vital for blood pressure regulation and signals various health issues.
  • Traditional photoplethysmogram (PPG) sites show weak vasoconstriction responses.
  • Real-time detection of vasoconstriction is crucial for numerous clinical applications.

Purpose of the Study:

  • To develop a wireless, soft sternal patch for robust vasoconstriction detection.
  • To assess the patch's capability in capturing endogenous and exogenous vasoconstriction.
  • To evaluate the patch's performance in long-term monitoring for conditions like sleep apnea.

Main Methods:

  • Designed and integrated a wireless, soft sternal patch for PPG signal acquisition.
  • Tested the device on healthy controls to detect induced vasoconstriction.
  • Conducted overnight trials with sleep apnea patients, comparing results to a commercial system.

Main Results:

  • The sternal patch successfully detected endogenous and exogenous vasoconstriction in healthy individuals.
  • High agreement (r² = 0.74) was observed between the sternal patch and a commercial system in sleep apnea patients.
  • Demonstrated the device's potential for portable, continuous, long-term vasoconstriction monitoring.

Conclusions:

  • The wireless sternal PPG patch is a promising tool for accurate vasoconstriction monitoring.
  • This technology enables non-invasive, real-time assessment of physiological responses.
  • The sternal patch offers a potential advancement for managing and monitoring various health conditions.