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Br J Ophthalmol 2000;84:435-436 ( April )

Scientific correspondence

Sub-Tenon's local anaesthesia: the effect of hyaluronidase Steven A Rowley, Julia E Hale, Robin D Finlay

Department of Ophthalmology, Royal United Hospital, Bath

Correspondence to: Steven Rowley, Bristol Eye Hospital, Lower Maudlin Street, Bristol BS1 2LX

Accepted for publication 8 December 1999

AIMS---A prospective, randomised, double blind study was used to investigate the effect of hyaluronidase on the quality of block achieved with sub-Tenon's local anaesthesia.
METHODS---150 patients scheduled for elective cataract surgery were randomly allocated to either sub-Tenon's block with 3 ml lignocaine 2%/adrenaline 1:200 000 alone or with the addition of 30 IU/ml of hyaluronidase. The blocks were assessed for degree of akinesia and reduction of eyelid movement, and also post-injection and postoperative pain scores.
RESULTS---Akinesia and reduction of eyelid movement measured 10 minutes after injection were significantly better in the group with hyaluronidase added to the anaesthetic solution. Postoperative pain scores were not significantly different between the two groups but the post-injection pain score was greater (marginally significant) in the group with hyaluronidase added.
CONCLUSION---The addition of hyaluronidase significantly improves the quality of the motor blockade achieved with sub-Tenon's local anaesthesia, but has no effect on the sensory blockade.

© 2000 by British Journal of Ophthalmology


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