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Published in: BMC Cardiovascular Disorders 1/2021

Open Access 01-12-2021 | Ultrasound | Research

Measuring the ratio of femoral vein diameter to femoral artery diameter by ultrasound to estimate volume status

Authors: Zhihang Ma, Jiaxin Gai, Yinghan Sun, Yunpeng Bai, Hongyi Cai, Lei Wu, Lixiu Sun, Junyan Liu, Li Xue, Bingchen Liu

Published in: BMC Cardiovascular Disorders | Issue 1/2021

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Abstract

Background

Currently, the accepted effective method for assessing blood volume status, such as measuring central venous pressure (CVP) and mean pulmonary artery pressure (mPAP), is invasive. The purpose of this study was to explore the feasibility and validity of the ratio of the femoral vein diameter (FVD) to the femoral artery diameter (FAD) for predicting CVP and mPAP and to calculate the cut-off value for the FVD/FAD ratio to help judge a patient’s fluid volume status.

Methods

In this study, 130 patients were divided into two groups: in group A, the FVD, FAD, and CVP were measured, and in group B, the FVD, FAD, and mPAP were measured. We measured the FVD and FAD by ultrasound. We monitored CVP by a central venous catheter and mPAP by a Swan-Ganz floating catheter. Pearson correlation coefficients were calculated. The best cut-off value for the FVD/FAD ratio for predicting CVP and mPAP was obtained according to the receiver operating characteristic (ROC) curve.

Results

The FVD/FAD ratio was strongly correlated with CVP (R = 0.87, P < 0.0000) and mPAP (R = 0.73, P < 0.0000). According to the ROC curve, an FVD/FAD ratio ≥ 1.495 had the best test characteristics to predict a CVP ≥ 12 cmH2O, and an FVD/FAD ratio ≤ 1.467 had the best test characteristics to predict a CVP ≤ 10 cmH2O. An FVD/FAD ratio ≥ 2.03 had the best test characteristics to predict an mPAP ≥ 25 mmHg. According to the simple linear regression curve of the FVD/FAD ratio and CVP, when the predicted CVP ≤ 5 cmH2O, the FVD/FAD ratio was ≤ 0.854.

Conclusion

In this study, the measurement of the FVD/FAD ratio obtained via ultrasound was strongly correlated with CVP and mPAP, providing a non-invasive method for quickly and reliably assessing blood volume status and providing good clinical support.
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Metadata
Title
Measuring the ratio of femoral vein diameter to femoral artery diameter by ultrasound to estimate volume status
Authors
Zhihang Ma
Jiaxin Gai
Yinghan Sun
Yunpeng Bai
Hongyi Cai
Lei Wu
Lixiu Sun
Junyan Liu
Li Xue
Bingchen Liu
Publication date
01-12-2021
Publisher
BioMed Central
Published in
BMC Cardiovascular Disorders / Issue 1/2021
Electronic ISSN: 1471-2261
DOI
https://doi.org/10.1186/s12872-021-02309-7

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