Diaphragm depth in normal subjects

Leili Shahgholi, Michael R. Baria, Eric J. Sorenson, Caitlin J. Harper, James C. Watson, Jeffrey A. Strommen, Andrea J. Boon

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)666-668
Number of pages3
JournalMuscle and Nerve
Volume49
Issue number5
DOIs
StatePublished - May 2014

Keywords

  • BMI
  • Depth
  • Diaphragm
  • Electromyography
  • Ultrasound

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)

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  • Cite this

    Shahgholi, L., Baria, M. R., Sorenson, E. J., Harper, C. J., Watson, J. C., Strommen, J. A., & Boon, A. J. (2014). Diaphragm depth in normal subjects. Muscle and Nerve, 49(5), 666-668. https://doi.org/10.1002/mus.23953