Methodological and Clinimetric Evaluation of Inspiratory Respiratory Muscle Ultrasound in the Critical Care Setting: A Systematic Review and Meta-Analysis

Author:

Truong Dominic1,Abo Shaza1,Whish-Wilson Georgina A.1,D’Souza Aruska N.2,Beach Lisa J.2,Mathur Sunita3,Mayer Kirby P.4,Ntoumenopoulos George5,Baldwin Claire6,El-Ansary Doa78,Paris Michael T.910,Mourtzakis Marina10,Morris Peter E.11,Pastva Amy M.12,Granger Catherine L.12,Parry Selina M.1,Sarwal Aarti13

Affiliation:

1. Department of Physiotherapy, The University of Melbourne, Parkville, VIC, Australia.

2. Department of Physiotherapy, The Royal Melbourne Hospital, Parkville, VIC, Australia.

3. School of Rehabilitation Therapy, Queen’s University, Kingston, ON, Canada.

4. Department of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, KY.

5. Department of Physiotherapy, St Vincent’s Hospital, Sydney, NSW, Australia.

6. Caring Futures Institute and College of Nursing and Health Sciences, Flinders University, Bedford Park, SA, Australia.

7. Department of Surgery, Melbourne Medical School, University of Melbourne, Melbourne, VIC, Australia.

8. School of Health Sciences, Swinburne University of Technology, Melbourne, VIC, Australia.

9. School of Kinesiology, University of Western Ontario, London, ON, Canada.

10. Department of Kinesiology and Health Sciences, University of Waterloo, Waterloo, ON, Canada.

11. Division of Pulmonary, Allergy, and Critical Care Medicine, Heersink School of Medicine, University of Alabama, Birmingham, AL.

12. School of Medicine, Duke University, Durham, NC.

13. Atrium Wake Forest School of Medicine, Winston Salem, NC.

Abstract

OBJECTIVE: Significant variations exist in the use of respiratory muscle ultrasound in intensive care with no society-level consensus on the optimal methodology. This systematic review aims to evaluate, synthesize, and compare the clinimetric properties of different image acquisition and analysis methodologies. DATA SOURCES: Systematic search of five databases up to November 24, 2021. STUDY SELECTION: Studies were included if they enrolled at least 50 adult ICU patients, reported respiratory muscle (diaphragm or intercostal) ultrasound measuring either echotexture, muscle thickness, thickening fraction, or excursion, and evaluated at least one clinimetric property. Two independent reviewers assessed titles, abstracts, and full text against eligibility. DATA EXTRACTION: Study demographics, ultrasound methodologies, and clinimetric data. DATA SYNTHESIS: Sixty studies, including 5,025 patients, were included with 39 studies contributing to meta-analyses. Most commonly measured was diaphragm thickness (DT) or diaphragm thickening fraction (DTF) using a linear transducer in B-mode, or diaphragm excursion (DE) using a curvilinear transducer in M-mode. There are significant variations in imaging methodology and acquisition across all studies. Inter- and intrarater measurement reliabilities were generally excellent, with the highest reliability reported for DT (ICC, 0.98; 95% CI, 0.94–0.99). Pooled data demonstrated acceptable to excellent accuracy for DT, DTF, and DE to predicting weaning outcome after 48 to 72 hours postextubation (DTF AUC, 0.79; 95% CI, 0.73–0.85). DT imaging was responsive to change over time. Only three eligible studies were available for intercostal muscles. Intercostal thickening fraction was shown to have excellent accuracy of predicting weaning outcome after 48-hour postextubation (AUC, 0.84; 95% CI, 0.78–0.91). CONCLUSIONS: Diaphragm muscle ultrasound is reliable, valid, and responsive in ICU patients, but significant variation exists in the imaging acquisition and analysis methodologies. Future work should focus on developing standardized protocols for ultrasound imaging and consider further research into the role of intercostal muscle imaging.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Critical Care and Intensive Care Medicine

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