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Related Experiment Videos

Direct orbital manometry in healthy patients.

C D Riemann1, J A Foster, G S Kosmorsky

  • 1Division of Ophthalmology, Clevelend Clinic Foundation, Ohio, USA.

Ophthalmic Plastic and Reconstructive Surgery
|April 6, 1999
PubMed
Summary

A new orbital manometer accurately measured orbital tissue tension and compartment compliance in normal patients. Retrobulbar injections significantly increased orbital tissue tension, highlighting the importance of assessing orbital dynamics.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Orbital compartment syndrome is a serious condition.
  • Accurate measurement of orbital tissue tension and compliance is crucial for patient safety during ocular surgery.

Purpose of the Study:

  • To determine orbital tissue tension and orbital compartment compliance in normal patients.
  • To assess the safety and efficacy of a novel orbital manometer.

Main Methods:

  • An orbital manometer was designed to measure orbital tissue tension before, during, and after retrobulbar injections.
  • Orbital compliance was calculated using volume and pressure changes.
  • Data were collected from 18 normal orbits.

Main Results:

  • Resting orbital tissue tension was 4.0 +/- 1.5 mmHg.

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  • Retrobulbar injection increased tension to 11.6 +/- 2.6 mmHg (p < 0.0000000001).
  • Orbital compartment compliance was 0.74 +/- 0.31 ml/mmHg.

    • Conclusions:

    • The orbital manometer safely and effectively measured orbital dynamics in vivo.
    • Retrobulbar injections cause significant, measurable changes in orbital tissue tension.
    • Assessing orbital dynamics can aid in evaluating orbital compartment syndrome and risks associated with retrobulbar injections.