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A modified retrobulbar block for eye surgery
D H Wong1, E Koehrer, H F Sutton
1Department of Anaesthesia, Faculty of Medicine, University of British Columbia, Vancouver, Canada.
Abstract:
A modified retrobulbar block (MRB) using a single superomedial injection was compared with the classical retrobulbar block (RB) and peribulbar block (PB) in a randomized, prospective, surgeon-blinded study involving 150 patients undergoing cataract surgery. No serious complication occurred in any of the patients. The MRB produced higher rates of total akinesia in the orbicularis and all the extraocular muscles, which were statistically significant for the orbicularis, superior, inferior and lateral rectus and oblique muscles when compared with RB, and for the superior rectus and oblique muscles when compared with PB. MRB required less supplemental blocks, provided good operating conditions for the surgeon, and achieved high patient acceptance. It is concluded that MRB is a useful alternative method of ocular block for cataract surgery.
Insights
A modified retrobulbar block (MRB) offers superior muscle akinesia for cataract surgery compared to traditional retrobulbar (RB) and peribulbar (PB) blocks. This safer, effective ocular anesthesia technique improves surgical conditions and patient acceptance.
Area of Science:
- Ophthalmology
- Anesthesiology
- Surgical Techniques
Background:
- Ocular anesthesia is crucial for cataract surgery.
- Traditional retrobulbar (RB) and peribulbar (PB) blocks are common methods.
- Need for improved efficacy and safety in ocular blockade.
Purpose of the Study:
- To compare the efficacy and safety of a modified retrobulbar block (MRB) with classical RB and PB.
- To evaluate akinesia rates, supplemental block requirements, surgical conditions, and patient acceptance.
Main Methods:
- Randomized, prospective, surgeon-blinded study.
- 150 patients undergoing cataract surgery.
- Comparison of MRB (single superomedial injection) versus RB and PB.
Main Results:
- MRB demonstrated significantly higher rates of total akinesia for orbicularis oculi and several extraocular muscles compared to RB and PB.
- MRB required fewer supplemental blocks.
- No serious complications were reported in any group; MRB provided excellent surgical conditions and high patient acceptance.
Conclusions:
- Modified retrobulbar block (MRB) is a safe and effective alternative for ocular anesthesia in cataract surgery.
- MRB offers superior muscle akinesia and improves surgical outcomes.
- High patient acceptance and reduced need for supplemental blocks support MRB's utility.
