RT Journal Article T1 Ultrasonographic reliability and repeatability of simultaneous bilateral assessment of diaphragm muscle thickness during normal breathing A1 Molina Hernández, Nerea A1 López Chicharro, José A1 Becerro De Bengoa Vallejo, Ricardo A1 Losa Iglesias, Marta Elena A1 Rodríguez Sanz, David A1 Vicente Campos, Davinia A1 Marugán Rubio, Daniel A1 Gutiérrez Torre, Samuel Eloy A1 Calvo Lobo, César AB Background: The diaphragm is considered the main muscle involved in breathing and also linked to trunk stabilization functions. Up to date, rehabilitative ultrasound imaging (RUSI) has been the most used technique to evaluate unilaterally the transcostal diaphragm thickness. Nevertheless, the inspiratory activity of both hemi-diaphragms is bilaterally performed at the same time, and its simultaneous evaluation with a thoracic orthosis could improve its assessment as well as its re-education with visual biofeedback of both hemi-diaphragms at the same time. The purpose was to evaluate the reliability and repeatability of simultaneous thickness measurements of both hemi-diaphragms bilaterally during normal breathing using a thoracic orthosis that allowed bilateral fixation of both right and left ultrasound probes.Methods: The study was conducted in 46 healthy subjects, whose diaphragm thickness was measured bilaterally and simultaneously in the anterior axillary line during relaxed breathing with a designed thoracic orthosis and 2 ultrasound tools. Intra-examiner (same examiner), inter-examiner (2 examiners), intra-session (1 hour) and inter-session (1 week) reliability and repeatability between each pair of measurements of diaphragm muscle thickness were analyzed during normal breathing.Results: Reliability and repeatability for intra-session evaluations using the thoracic orthosis were excellent to evaluate simultaneous thickness of both hemi-diaphragms by bilateral probes fixation (intraclass correlation coefficient =0.919–0.997; standard error of measurement =0.002–0.007 cm; minimum detectable change =0.006–0.020 cm), without systematic errors (P>0.05) between each pair of measurements. Nevertheless, inter-session evaluations varied from good to excellent using the bilateral probes fixation (intraclass correlation coefficient =0.614–0.984; standard error of measurement =0.006–0.028 cm; minimum detectable change =0.017–0.079 cm), although some systematic errors were presented (P<0.05).Conclusions: Good to excellent reliability and repeatability was shown for simultaneous thickness measurements of both hemi-diaphragms bilaterally during normal breathing. Despite systematic errors were presented for some inter-examiner assessments, the use of the thoracic orthosis that allowed bilateral fixation of ultrasound probes could be recommended for simultaneous hemi-diaphragms breathing re-education by visual biofeedback. PB AME PUBLISHING COMPANY YR 2023 FD 2023-08-17 LK https://hdl.handle.net/20.500.14352/106111 UL https://hdl.handle.net/20.500.14352/106111 LA spa NO Molina-Hernández N, Chicharro JL, Becerro-de-Bengoa-Vallejo R, Losa-Iglesias ME, Rodríguez-Sanz D, Vicente-Campos D, Marugán-Rubio D, Gutiérrez-Torre SE, Calvo-Lobo C. Ultrasonographic reliability and repeatability of simultaneous bilateral assessment of diaphragm muscle thickness during normal breathing. Quant Imaging Med Surg. 2023 Oct 1;13(10):6656-6667. doi: 10.21037/qims-23-329. NO This work was supported by the Ministry of Science and Research as well as the State Agency for Investigation of the Spanish Government under the 2020 Call for Innovation, Development, and Research (“I+D+i Projects”) within the framework of the State Programs for Knowledge Generation and Scientific and Technological Strengthening of the I+D+i System and I+D+i oriented to the Challenges of Society (grant No. PID2020-117162RA-I00, funded by MCIN/AEI/10.13039/501100011033). DS Docta Complutense RD 20 ago 2024