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Sub-Tenon's injection for local anesthesia in posterior segment surgery
1Department of Ophthalmology and Visual Sciences, University of Texas Medical Branch, Galveston 77555-0787, USA.
Ophthalmology
|January 27, 2000
Summary
Sub-Tenon
Area of Science:
- Ophthalmology
- Anesthesiology
Background:
- Posterior segment surgery requires effective local anesthesia.
- Sub-Tenon's parabulbar injection is a technique for delivering local anesthetic near the eye.
Purpose of the Study:
- To evaluate the safety and efficacy of sub-Tenon's parabulbar anesthesia for posterior segment surgery.
Main Methods:
- Prospective case series of 200 patients undergoing posterior segment surgery.
- Primary anesthesia administered via sub-Tenon's parabulbar injection (lidocaine, bupivacaine, hyaluronidase).
- Supplementation rates and complications were monitored, analyzing relation to surgery duration and pain level.
Main Results:
- 14% of patients required supplemental anesthesia (intravenous or intraoperative local).
- Supplementation was significantly associated with longer surgery duration (>3 hours) and more painful procedures (scleral buckle, cryotherapy).
- No ocular or systemic complications were observed.
Conclusions:
- Sub-Tenon's parabulbar anesthesia is safe and effective for shorter (<3 hours) posterior segment surgeries like vitrectomy.
- More extensive or painful procedures may necessitate supplemental anesthesia for optimal patient comfort and surgical conditions.