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Department of Ophthalmology, Princess Margaret Hospital, Dunfermline, Fife, United Kingdom
Address correspondence and reprint requests to Niall Patton, Department of Ophthalmology, Sir Charles Gairdner Hospital, Nedlands, WA 6009, Australia. Address e-mail to niallpatton{at}yahoo.co.uk.
We performed a prospective, randomized trial assessing the "remaining" volume of anesthetic solution that stays within the sub-Tenons space after administration of 2 different volumes: 3 mL and 5 mL. The remaining volume correlated with motor block (r = 0.72; P < 0.001). The volume lost through the incision as a percentage of total volume injected was similar in both groups, suggesting sub-Tenons space is not limited to a finite injected volume less than 5 mL and may be capable of receiving larger volumes of anesthetic to improve motor block.
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