Comparison of Olive Tipped and Conventional Steven's Cannula for Sub-Tenon Ophthalmic Anesthesia.

Purpose: To compare the efficacy of the olive tipped (OT) cannula to the conventional Steven's cannula for sub-Tenon block (STB) before cataract surgery.

Methods: This prospective, randomized, double-masked compared STB delivered in cataract surgery patients with an OT cannula or a conventional Steven's cannula (ST). Outcome variables included the akinesia score and lid movement scores at 5 and 10 min. The patient perception of pain during delivery of the STB and surgery were also compared between groups. Surgeon satisfaction with anesthesia was compared between groups. <0.05 was statistically significant.

Results: There were sixty patients in each group. The age between groups was not statistically different ( = 0.4). The body mass index was higher in the ST group compared to the OT group ( < 0.001). The akinesia score at 5 and 10 min did not differ between groups ( = 0.07 and = 0.6, respectively). The patient perception of pain during STB and surgery were similar between groups ( = 0.1 and = 0.06, respectively). There were six patients with mild chemosis and redness in the OT group and 15 patients in the ST group.

Conclusion: An OT cannula is equally effective as the conventional Steven's cannula for delivering STB anesthesia before cataract surgery.