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Decrease in intraocular pressure after orbital decompression for thyroid orbitopathy

S Dev1, K F Damji, C M DeBacker

  • 1Department of Ophthalmology, Duke University Medical Center, Durham, NC, USA.

Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
|November 18, 1998
PubMed
Summary
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Orbital decompression surgery significantly lowers intraocular pressure (IOP) in patients with thyroid orbitopathy. This reduction may decrease the need for glaucoma management in severe cases.

Area of Science:

  • Ophthalmology
  • Endocrinology
  • Surgical Science

Background:

  • The impact of thyroid orbitopathy on intraocular pressure (IOP) is debated.
  • Thyroid orbitopathy can cause orbital congestion, potentially increasing IOP.

Purpose of the Study:

  • To investigate the effect of orbital decompression surgery on IOP in patients with advanced thyroid orbitopathy.

Main Methods:

  • Retrospective review of 12 patients (22 eyes) undergoing decompression surgery.
  • IOP measurements using applanation tonometry before and after surgery were analyzed.
  • Patients maintained consistent medication regimens pre- and post-surgery.

Main Results:

  • Mean preoperative IOP was 19.8 mm Hg, decreasing to 16.8 mm Hg postoperatively (p = 0.008).

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  • Eyes with preoperative IOP ≥ 21 mm Hg showed a mean IOP decrease of 5.6 mm Hg.
  • Preoperative IOP elevation strongly predicted the degree of IOP reduction after surgery (p = 0.014).

    • Conclusions:

    • Orbital decompression surgery effectively reduces IOP in thyroid orbitopathy.
    • The mechanism likely involves decreased episcleral venous pressure (EVP) due to reduced orbital congestion.
    • Decompression may reduce the necessity for aggressive glaucoma treatment in these patients.