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Ischemic optic neuropathy after lumbar spine surgery

D M Katz1, J D Trobe, W T Cornblath

  • 1Department of Ophthalmology (W. K. Kellogg Eye Center, University of Michigan Medical Center, Ann Arbor.

Archives of Ophthalmology (Chicago, Ill. : 1960)
|July 1, 1994
PubMed
Summary

Multilevel lumbar spine surgery can cause ischemic optic neuropathy (ION). Prolonged surgery with deliberate hypotension and anemia, especially in patients with arteriosclerotic risk factors, may lead to this complication.

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Area of Science:

  • Ophthalmology
  • Neurosurgery
  • Vascular Surgery

Background:

  • Ischemic optic neuropathy (ION) is a known complication of various surgical procedures.
  • The association between ION and spine surgery, particularly multilevel lumbar laminectomy, requires further elucidation.

Purpose of the Study:

  • To investigate the clinical features of ischemic optic neuropathy (ION) following multilevel lumbar spine surgery.
  • To identify potential risk factors and mechanisms contributing to ION in this surgical context.

Main Methods:

  • Retrospective review of ION cases developing within two weeks of multilevel lumbar spine surgery at two academic institutions (1990-1992).
  • Inclusion of previously reported cases of ION after other non-ophthalmic procedures for comparative analysis.
  • Analysis of patient demographics, surgical details (duration, blood pressure management, blood loss), and pre-existing risk factors.

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Main Results:

  • Four new cases of ION post-lumbar spine surgery were identified in patients aged 41-65.
  • All cases involved prolonged surgeries (8-9 hours) with deliberate hypotension (systolic 85-100 mm Hg, diastolic 45-65 mm Hg) and significant hemoglobin drop (30-78 g/L).
  • Three patients had pre-existing arteriosclerotic risk factors (hypertension, diabetes, CAD, smoking); no orbital or retinal vascular events were noted.

Conclusions:

  • Multilevel lumbar laminectomy should be recognized as a potential cause of isolated ischemic optic neuropathy (ION).
  • The combination of prolonged operative time, deliberate hypotension, and anemia, particularly in patients with arteriosclerotic risk factors, is implicated in the development of ION.
  • This finding highlights the importance of vigilant hemodynamic management during extensive spinal procedures.