Evaluation of Complications Associated with Peribulbar and Sub-Tenon’s Block in Ophthalmic Surgery: A Prospective Observational Study
Background: Peribulbar and sub-Tenon’s blocks are commonly used for ophthalmic surgery, but their complication profiles and clinical performance may differ.
Objective: To compare complications, block adequacy, patient comfort, and intraoperative outcomes associated with peribulbar and sub-Tenon’s blocks in ophthalmic surgery.
Methods: This prospective observational study included 160 adults undergoing elective ophthalmic surgery at S. M. College and Hospital, Uttar Pradesh, during 2008–2009. Patients received either peribulbar block or sub-Tenon’s block, with 80 patients in each group. Block-related complications, pain during administration, adequacy of anesthesia, need for supplementary anesthesia, intraoperative stability, and satisfaction scores were recorded.
Results: Overall complication rates were similar between peribulbar and sub-Tenon’s groups: 38 patients (47.5%) versus 39 patients (48.8%), respectively (p=0.874). Most complications were minor. One retrobulbar hemorrhage occurred in the peribulbar group, with no major complication in the sub-Tenon’s group. Pain during block administration was higher with peribulbar block (VAS 2.71±1.05 vs 1.50±0.86; p<0.001). Complete ocular akinesia was more frequent with peribulbar block (76.2% vs 47.5%; p<0.001), while inadequate block and supplementary anesthesia were more frequent with sub-Tenon’s block (13.8% vs 3.8%, p=0.025; 15.0% vs 3.8%, p=0.015). Patient satisfaction was higher with sub-Tenon’s block (4.26±0.84 vs 3.99±0.85; p=0.034).
Conclusion: Both blocks were safe, with similar overall complication rates. Peribulbar block provided better akinesia, whereas sub-Tenon’s block offered greater comfort and satisfaction.