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Published in: Critical Care 1/2020

Open Access 01-12-2020 | Ultrasound | Research

Real-time shear wave ultrasound elastography: a new tool for the evaluation of diaphragm and limb muscle stiffness in critically ill patients

Authors: Aurelien Flatres, Yassir Aarab, Stephanie Nougaret, Fanny Garnier, Romaric Larcher, Mathieu Amalric, Kada Klouche, Pascal Etienne, Gilles Subra, Samir Jaber, Nicolas Molinari, Stefan Matecki, Boris Jung

Published in: Critical Care | Issue 1/2020

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Abstract

Background

Muscle weakness following critical illness is the consequence of loss of muscle mass and alteration of muscle quality. It is associated with long-term disability. Ultrasonography is a reliable tool to quantify muscle mass, but studies that evaluate muscle quality at the critically ill bedside are lacking. Shear wave ultrasound elastography (SWE) provides spatial representation of soft tissue stiffness and measures of muscle quality. The reliability and reproducibility of SWE in critically ill patients has never been evaluated.

Methods

Two operators tested in healthy controls and in critically ill patients the intra- and inter-operator reliability of the SWE using transversal and longitudinal views of the diaphragm and limb muscles. Reliability was calculated using the intra-class correlation coefficient and a bootstrap sampling method assessed their consistency.

Results

We collected 560 images. Longitudinal views of the diaphragm (ICC 0.83 [0.50–0.94]), the biceps brachii (ICC 0.88 [0.67–0.96]) and the rectus femoris (ICC 0.76 [0.34–0.91]) were the most reliable views in a training set of healthy controls. Intra-class correlation coefficient for inter-operator reproducibility and intra-operator reliability was above 0.9 for all muscles in a validation set of healthy controls. In critically ill patients, inter-operator reproducibility and intra-operator 1 and 2 reliability ICCs were respectively 0.92 [0.71–0.98], 0.93 [0.82–0.98] and 0.92 [0.81–0.98] for the diaphragm; 0.96 [0.86–0.99], 0.98 [0.94–0.99] and 0.99 [0.96–1] for the biceps brachii and 0.91 [0.51–0.98], 0.97 [0.93–0.99] and 0.99 [0.97–1] for the rectus femoris. The probability to reach intra-class correlation coefficient greater than 0.8 in a 10,000 bootstrap sampling for inter-operator reproducibility was respectively 81%, 84% and 78% for the diaphragm, the biceps brachii and the rectus femoris respectively.

Conclusions

SWE is a reliable technique to evaluate limb muscles and the diaphragm in both healthy controls and in critically ill patients.

Trial registration

The study was registered (ClinicalTrial NCT03550222).
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Metadata
Title
Real-time shear wave ultrasound elastography: a new tool for the evaluation of diaphragm and limb muscle stiffness in critically ill patients
Authors
Aurelien Flatres
Yassir Aarab
Stephanie Nougaret
Fanny Garnier
Romaric Larcher
Mathieu Amalric
Kada Klouche
Pascal Etienne
Gilles Subra
Samir Jaber
Nicolas Molinari
Stefan Matecki
Boris Jung
Publication date
01-12-2020
Publisher
BioMed Central
Published in
Critical Care / Issue 1/2020
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/s13054-020-2745-6

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