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AMBULATORY ANESTHESIA

Sub-Tenon’s Anesthetic Administration for Cataract Surgery: How Much Stays In?

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-Tenon’s 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-Tenon’s 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.