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A comparison of three sub-Tenon's cannulae.

C M Kumar1, C Dodds, H McLure

  • 1Department of Anaesthesia, The James Cook University Hospital, Middlesbrough, UK. cmkumar@boas.org

Eye (London, England)
|February 14, 2004
PubMed
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This study compared three sub-Tenon cannulae for cataract surgery anesthesia. While all provided good anesthesia, longer cannulae reduced eye muscle activity and complications like chemosis and hemorrhage.

Area of Science:

  • Ophthalmology
  • Anesthesiology
  • Surgical Techniques

Background:

  • Sub-Tenon's injection is a common method for ocular anesthesia.
  • Different cannula designs may influence anesthetic efficacy and complication rates.

Purpose of the Study:

  • To compare anesthesia quality and complication rates using three distinct sub-Tenon cannulae of varying lengths.
  • Evaluate anterior (Greenbaum), mid (Kumar-Dodds), and posterior (Steven's) cannulae.

Main Methods:

  • 150 patients undergoing cataract extraction were randomized.
  • Sub-Tenon injection of lidocaine with hyaluronidase was administered using one of three cannulae.
  • Anesthesia quality (akinesia) and complications were assessed over a 6-minute period.

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Main Results:

  • No significant difference in the onset of akinesia was observed between the three groups.
  • Anterior cannulae showed increased retained lid opening and significantly more chemosis and conjunctival hemorrhages.
  • Posterior cannulae resulted in less retained lid closure, but increased pain on injection compared to anterior cannulae.

Conclusions:

  • All three sub-Tenon cannulae provide high-quality anesthesia for cataract surgery.
  • Differences exist in complication rates, with longer cannulae potentially reducing certain adverse events.