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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.
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Related Experiment Video

Updated: May 10, 2026

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis
07:17

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Published on: August 17, 2022

Estimation of Excess Extracellular Fluid Volume Using Blood Volume Monitoring: A Comparison With Bioimpedance

Shota Yoshizawa1, Ai Akazawa2, Takahiro Shinzato3

  • 1Mihama Hospital, Chiba, Japan.

Hemodialysis International. International Symposium on Home Hemodialysis
|May 8, 2026
PubMed
Summary

A new method estimates excess extracellular fluid volume (VECF) using blood volume monitoring, offering a simpler alternative to bioimpedance spectroscopy for dialysis patients. This approach shows significant correlation but requires further validation.

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Area of Science:

  • Nephrology
  • Biomedical Engineering
  • Fluid Balance Management

Background:

  • Excess extracellular fluid volume (VECF) negatively impacts dialysis patient outcomes.
  • Bioimpedance spectroscopy (BIS) is a standard but equipment-intensive method for VECF assessment.
  • A simpler, accessible method for VECF estimation is needed.

Purpose of the Study:

  • To develop and validate a novel mathematical model for estimating excess VECF.
  • To utilize readily available blood volume monitoring data.
  • To compare the novel method against BIS for VECF assessment in dialysis patients.

Main Methods:

  • A mathematical model was created to estimate excess VECF using relative blood volume at the end of dialysis.
  • The model's estimations were compared to excess VECF measured by BIS immediately post-dialysis.
  • Correlation and agreement analyses (including Bland-Altman) were performed.

Main Results:

  • A strong correlation (r2 = 0.7526, p < 0.0001) was found between blood volume-based and BIS-derived excess VECF.
  • Bland-Altman analysis revealed a fixed bias, with the blood volume method overestimating VECF (+0.86 L/m2).
  • No proportional bias was detected, indicating consistent overestimation across VECF ranges.

Conclusions:

  • The blood volume-based method shows promise as a tool for VECF assessment in dialysis.
  • Potential sources of error include assumptions of isotonicity and f-cell ratio variability.
  • Further validation is necessary before this method can replace BIS.