ABSTRACT
PURPOSE: To determine the necessity of hyaluronidase as an anesthetic adjuvant for peribulbar anesthesia during cataract surgery and to assess differences in anesthetic outcomes in the absence of hyaluronidase. METHODS: In this double blinded randomized study, 202 patients reporting for surgery for senile cataract in their first eye under regional ocular anesthesia without pre-existing extra ocular movement restriction were randomly divided into 2 groups: Group 1 - anesthesia without hyaluronidase, Group 2 - anesthesia with 50â¯IU/ml Hyaluronidase. Peribulbar block with 5â¯ml of anesthetic mixture of 2% lignocaine with 1:200000 adrenaline and 0.5% bupivacaine with or without hyaluronidase was performed with 3â¯ml deposited in the infero-medial quadrant and 2â¯ml in the supero-medial quadrant followed by ocular massage. Surgeons' score for akinesia, patients' score for analgesia, augmentation of block if any and extra ocular movements on first post-operative day were compared between the groups. RESULTS: There was no statistically significant difference between the two groups in akinesia (pâ¯=â¯0.22, 0.68 and 0.98), analgesia (pâ¯=â¯0.44 and 0.09) or requirement of anesthetic augmentation (pâ¯=â¯0.3). Extraocular movement restriction was not noted in any patient. Onset of akinesia and analgesia was earlier in Group 2 (pâ¯=â¯0.004 and pâ¯=â¯0.005 respectively). CONCLUSIONS: Hyaluronidase is not an essential adjuvant for peribulbar block for cataract surgeries. Appropriate deposition of a smaller volume of anesthetic agent and adequate ocular massage provide adequate and safe anesthesia.