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Assessment of blood pressure in brachial artery(two-step method)01:23

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

665
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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Sites for measruring blood pressure01:21

Sites for measruring blood pressure

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Blood pressure measurement is a fundamental clinical procedure, providing crucial data for assessing cardiovascular health. Among the various sites for this measurement, the brachial and popliteal arteries are predominantly utilized due to their accessibility and the reliability of their readings. This lesson delves into the anatomical significance, methodology, and considerations of measuring blood pressure at these locations.
The Brachial Artery: Primary Site for Blood Pressure Measurement
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Related Experiment Video

Updated: Jun 15, 2025

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb
06:50

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

Published on: December 2, 2017

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Pilot study on optimizing pressure for standardized capillary refill time measurement.

Zi-Yu Ma1, Shen Sun1, Shui-Cai Wu1

  • 1Faculty of Environment and Life, Beijing University of Technology, China, No. 100 Pingleyuan, Chaoyang District, Beijing, 100124, China.

Heliyon
|August 22, 2024
PubMed
Summary
This summary is machine-generated.

Optimizing pressure is key for accurate Capillary Refill Time (CRT) measurements in sepsis. Applying 10.0N-10.5N force ensures the most reliable and consistent CRT readings.

Keywords:
Capillary refill timeMicrocirculationPressureSepsisSeptic shock

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Area of Science:

  • Biomedical Engineering
  • Physiology
  • Critical Care Medicine

Background:

  • Capillary Refill Time (CRT) measurement is increasingly vital for assessing conditions like sepsis and septic shock.
  • Standardizing CRT measurement requires understanding the influence of applied pressure.
  • Previous methods lacked standardized pressure application, potentially affecting accuracy.

Purpose of the Study:

  • To determine the optimal pressing strength for standardized Capillary Refill Time (CRT) measurement.
  • To analyze the impact of varying pressure levels on CRT readings.
  • To establish a reliable protocol for CRT assessment in clinical settings.

Main Methods:

  • Seventeen healthy volunteers participated in CRT tests on fingertips.
  • Applied forces ranged from 0.5N to 10.5N, increasing incrementally by 0.5N.
  • Photoplethysmography (PPG) captured light intensity fluctuations; a specialized algorithm derived CRT.

Main Results:

  • Significant differences in CRT were observed across 21 pressure levels (p < 0.0001).
  • CRT measurements between 4.5N and 10.5N showed moderate consistency (ICC = 0.499).
  • Pressures of 10.0N and 10.5N demonstrated strong agreement and reliability (ICC = 0.790).

Conclusions:

  • A pressure range of 4.5N-10.5N is recommended for stable CRT measurements.
  • Optimal consistency and reliability for CRT assessment are achieved with 10.0N-10.5N applied force.
  • Findings support the development of standardized protocols for pressure-controlled CRT measurement.