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Related Concept Videos

Assessment of blood pressure in brachial artery(one-step method)01:15

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This procedural guide systematically measures blood pressure using an oscillometric digital sphygmomanometer, emphasizing accuracy, patient safety, and comfort.
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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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When assessing blood pressure (BP), healthcare professionals must consider various factors and potential unexpected outcomes to ensure accurate readings and provide proper patient care. Adhering to these guidelines is essential to achieving the most reliable results.
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Related Experiment Video

Updated: Mar 24, 2026

Software for Analysis of Heart Rate and Blood Pressure Time-series Data from the Valsalva Maneuver
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Feed-forward active contour analysis for improved brachial artery reactivity testing.

Daniel N Pugliese1, Chandra M Sehgal2, Laith R Sultan2

  • 1Department of Internal Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA daniel.pugliese@uphs.upenn.edu.

Vascular Medicine (London, England)
|March 20, 2016
PubMed
Summary

A new algorithm improves brachial artery reactivity analysis. The feed-forward active contour (FFAC) method offers greater reproducibility for flow-mediated dilation (FMD) measurements, potentially enabling wider clinical use.

Keywords:
active contourbrachial artery reactivityendothelial functionflow-mediated dilationultrasound segmentation

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Area of Science:

  • Cardiovascular Research
  • Medical Imaging Analysis
  • Biomedical Engineering

Background:

  • Flow-mediated dilation (FMD) is a key indicator of vascular endothelial function.
  • Current FMD measurement techniques suffer from significant inter-observer variability and technical limitations, hindering widespread clinical adoption.
  • There is a need for a more reliable and reproducible method for FMD analysis.

Purpose of the Study:

  • To develop and validate a novel feed-forward active contour (FFAC) algorithm for reproducible brachial artery reactivity analysis.
  • To assess the performance of the FFAC algorithm in reducing inter-observer variability compared to conventional methods.
  • To determine if the FFAC algorithm can improve the reliability of FMD measurements for potential clinical application.

Main Methods:

  • A novel FFAC algorithm was developed for automated image segmentation.
  • Ultrasound videos of brachial artery FMD were acquired from 46 healthy volunteers in longitudinal and transverse views.
  • The FFAC algorithm was used to measure arterial diameter and cross-sectional area, calculating %FMD. Measurements were compared against conventional techniques and analyzed for variability (CV) and reliability (ICC).

Main Results:

  • The FFAC algorithm demonstrated significantly lower population-specific (3.24% vs. 9.96%) and subject-specific (15.03% vs. 57.41%) coefficients of variation (CV) in transverse views compared to longitudinal views.
  • Intraclass correlation coefficients (ICC) for the FFAC algorithm were high (0.97 for transverse, 0.90 for longitudinal), significantly outperforming conventional methods (0.72).
  • Transverse FFAC measurements showed substantially reduced inter-observer variability compared to traditional longitudinal measurements.

Conclusions:

  • The novel FFAC algorithm, particularly using transverse views, offers a highly reproducible method for brachial artery FMD analysis.
  • The improved reproducibility demonstrated by the FFAC method may overcome current limitations, facilitating the clinical adoption of FMD testing.
  • The FFAC algorithm presents a robust alternative to conventional techniques for FMD measurement, warranting further evaluation.