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Related Concept Videos

Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

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.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

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...
Measurement of Blood Pressure01:17

Measurement of Blood Pressure

Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a stethoscope.

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Related Experiment Videos

Cuffless hemodynamic monitoring with physics-informed machine learning models.

Henry Crandall1, Tyler Schuessler2, Filip Bělík2,3

  • 1Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, UT, USA.

Nature Communications
|May 14, 2026
PubMed
Summary

A new smartwatch uses electrical bioimpedance (BioZ) for cuffless blood pressure (BP) monitoring. This innovative approach offers accurate hemodynamic assessments, overcoming limitations of current wearable BP devices.

Related Experiment Videos

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Physiology
  • Wearable Technology

Background:

  • Cuffless wearable devices for blood pressure (BP) monitoring are limited by methods lacking theoretical foundations, such as pulse wave analysis or pulse arrival time.
  • These limitations lead to inaccuracies due to physiological and experimental confounders, reducing clinical utility.
  • Continuous hemodynamic monitoring is crucial for managing cardiovascular health.

Purpose of the Study:

  • To develop a smartwatch device for cuffless hemodynamic monitoring using real-time electrical bioimpedance (BioZ) sensing.
  • To establish the biophysical relationship between BioZ signals and BP through advanced modeling.
  • To enable accurate estimation of BP and blood velocity using a physics-informed neural network.

Main Methods:

  • Development of a smartwatch with integrated electrical bioimpedance (BioZ) sensing.
  • Utilizing a multiscale analytical and computational modeling framework to link BioZ and BP.
  • Implementation of a signal-tagged physics-informed neural network incorporating fluid dynamics for BP and blood velocity estimation.

Main Results:

  • Successfully elucidated the biophysical relationship between BioZ and BP, identifying key influencing parameters.
  • Demonstrated accurate cuffless BP and blood velocity monitoring in healthy individuals and patients with cardiovascular conditions.
  • Validated the approach across various conditions, including rest, physical activity, and autonomic challenges.

Conclusions:

  • Electrical bioimpedance (BioZ) technology is feasible for cuffless BP and blood velocity monitoring.
  • The developed smartwatch addresses critical limitations of existing cuffless wearable BP devices.
  • This technology holds potential for transforming ambulatory and at-home hemodynamic assessments.