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A comparison of three sub-Tenon's cannulae
1Department of Anaesthesia, The James Cook University Hospital, Middlesbrough, UK. cmkumar@boas.org
Eye (London, England)
|February 14, 2004
Summary
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.
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.