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Related Experiment Videos

Optic nerve sheath diameter does not change with patient position.

Lisa Romagnuolo1, Vivek Tayal, Christian Tomaszewski

  • 1Department of Emergency Medicine, Carolinas Medical Center, Box 32861, Charlotte, NC 28232, USA.

The American Journal of Emergency Medicine
|September 6, 2005
PubMed
Summary

Optic nerve sheath diameter (ONSD) measurements did not significantly change in healthy adults when moving between supine, Trendelenburg's, and reverse Trendelenburg's positions. This suggests ONSD may be a reliable indicator of intracranial pressure regardless of patient positioning.

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Area of Science:

  • Neurology
  • Medical Imaging

Background:

  • Optic nerve sheath diameter (ONSD) is a potential marker for elevated intracranial pressure.
  • Trendelenburg's and reverse Trendelenburg's positions are utilized in managing hypotensive and head-injured patients, respectively.

Purpose of the Study:

  • To investigate the effect of Trendelenburg's and reverse Trendelenburg's positions on ONSD in healthy adults.
  • To determine if patient positioning influences ONSD measurements.

Main Methods:

  • A prospective, blinded case-control study involving 10 healthy adult volunteers.
  • ONSD was measured using ultrasound in the supine, Trendelenburg's, and reverse Trendelenburg's (30 degrees head-up) positions.
  • Data were analyzed using ANOVA and paired t-tests.

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Main Results:

  • Mean ONSD values showed no statistically significant difference across the supine, Trendelenburg's, and reverse Trendelenburg's positions for either eye.
  • Interobserver agreement for ONSD measurements was high, exceeding 90% agreement within +/-1 mm.

Conclusions:

  • Ultrasound measurement of ONSD remains stable in healthy individuals across different body positions.
  • Patient positioning does not appear to significantly alter ONSD in the absence of elevated intracranial pressure.