This publication was made possible by CTSA Grant UL1 TR000135 from the National Center for Advancing Translational Sciences (NCATS), a component of the National Institutes of Health (NIH). Its contents are solely the responsibility of the authors and do not necessarily represent the official view of NIH.
Diaphragm depth in normal subjects
Article first published online: 27 FEB 2014
Copyright © 2013 Wiley Periodicals, Inc.
Muscle & Nerve
Volume 49, Issue 5, pages 666–668, May 2014
How to Cite
Shahgholi, L., Baria, M. R., Sorenson, E. J., Harper, C. J., Watson, J. C., Strommen, J. A. and Boon, A. J. (2014), Diaphragm depth in normal subjects. Muscle Nerve, 49: 666–668. doi: 10.1002/mus.23953
- Issue published online: 16 APR 2014
- Article first published online: 27 FEB 2014
- Accepted manuscript online: 19 JUL 2013 05:13AM EST
- Manuscript Accepted: 6 JUL 2013
- Manuscript Revised: 5 JUL 2013
- Manuscript Received: 13 FEB 2013
Introduction: Needle electromyography (EMG) of the diaphragm carries the potential risk of pneumothorax. Knowing the approximate depth of the diaphragm should increase the test's safety and accuracy. Methods: Distances from the skin to the diaphragm and from the outer surface of the rib to the diaphragm were measured using B mode ultrasound in 150 normal subjects. Results: When measured at the lower intercostal spaces, diaphragm depth varied between 0.78 and 4.91 cm beneath the skin surface and between 0.25 and 1.48 cm below the outer surface of the rib. Using linear regression modeling, body mass index (BMI) could be used to predict diaphragm depth from the skin to within an average of 1.15 mm. Conclusions: Diaphragm depth from the skin can vary by more than 4 cm. When image guidance is not available to enhance accuracy and safety of diaphragm EMG, it is possible to reliably predict the depth of the diaphragm based on BMI. Muscle Nerve 49: 666–668, 2014