Spinal Arteriovenous Malformations

137 Spinal Arteriovenous Malformations
Peter D. Angevine


♦ Preoperative


Operative Planning



  • Review imaging (magnetic resonance imaging [MRI], selective spinal angiography)

Embolization



  • Preoperative embolization with polyvinyl alcohol, coils, or balloons 1 day before surgery may facilitate resection by reducing blood flow
  • Dexamethasone is given to reduce swelling after embolization

Routine Equipment



  • Laminectomy instruments
  • High-speed drill
  • Microsurgical instruments

Special Equipment



  • Consider neurophysiological monitoring for somatosensory evoked potentials and motor evoked potentials

Operating Room Set-up



  • Open-frame spinal table or electric table with bolsters or Wilson frame
  • Ensure ability to obtain anteroposterior and lateral radiographs to confirm operative levels
  • Headlight
  • Loupes (optional)
  • Bipolar (irrigating and nonirrigating) and Bovie cautery
  • Microscope with bridge

Anesthetic Issues



  • General anesthesia
  • Arterial line for blood pressure monitoring
  • Intravenous antibiotics (cefazolin 2 g or vancomycin 1 g for adults) should be given 30 minutes prior to incision
  • Minimize halogenated inhalational agents and nitrous oxide to optimize responses if performing neurophysiological monitoring

♦ Intraoperative (Fig. 137.1)


Positioning



  • Head secured with foam mask, Gardner-Wells tongs with 15 lb of traction, or Mayfield head holder
  • If using foam mask, ensure no ocular pressure
  • For lesions at T6 or above, arms well padded and tucked along sides; for more distal lesions, shoulders abducted and elbows flexed 90 degrees

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Jul 11, 2016 | Posted by in NEUROSURGERY | Comments Off on Spinal Arteriovenous Malformations

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