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Related Experiment Videos

The mediastinum--is it wide?

C E Gleeson1, R L Spedding, L A Harding

  • 1Accident and Emergency, Warrington Hospital NHS Trust.

Emergency Medicine Journal : EMJ
|May 17, 2001
PubMed
Summary

The 8 cm upper limit for normal mediastinal width is outdated for modern trauma care. New upper limits are defined based on current radiographic techniques to accurately assess mediastinal width in trauma patients.

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Area of Science:

  • Radiology
  • Trauma Imaging
  • Thoracic Medicine

Background:

  • The traditional 8 cm upper limit for mediastinal width was established in the 1970s.
  • Modern trauma care and imaging techniques may differ significantly from those used previously.

Purpose of the Study:

  • To re-evaluate the applicability of the 8 cm upper limit for mediastinal width in contemporary trauma settings.
  • To establish updated normal upper limits for mediastinal width on supine chest radiographs.

Main Methods:

  • Retrospective review of chest computed tomography (CT) scans to measure mediastinal width and position.
  • Analysis of radiographic techniques to determine mediastinal magnification factors.

Main Results:

  • The mean mediastinal width was found to be 6.31 cm.
  • Standard radiography resulted in magnification, yielding mediastinal widths of 8.93-10.07 cm.
  • Adjustments in radiographic technique reduced magnification, with measured widths between 7.31-7.92 cm.

Conclusions:

  • The 1970s-era 8 cm upper limit is no longer applicable in modern trauma imaging.
  • Modifications in X-ray cassette positioning and source-to-patient distance can decrease mediastinal magnification.
  • New upper limits for mediastinal width are proposed, tailored to various trauma imaging techniques.

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