Hyaluronidase in sub-Tenon’s anesthesia for phacoemulsification,a double-blind randomized clinical trial

AIM:To investigate the effect of hyaluronidase use on the quality of sub-Tenon’s anaesthesia for phacoemulsification.· METHODS:This was a randomized,double-blind clinical trial which was conducted at Nikookari Eye Hospital for 5 months.Forty-two eyes of candidates for phacoemulsification under sub-Tenon’s anaesthesia were randomly allocated to two equal groups and received either 2 mL of lidocaine 2% solution with(LH),or without(L) addition of hyaluronidase(150IU/mL).Akinesia was assessed 15 minutes after sub-Tenon’s injection.Patients and surgeon’s satisfaction,as well as the postoperative pain(the visual analogue scale,VAS) were investigated after operation.The contingency tables(including the Chi-square or Fisher’s exact tests,when appropriate) and parametric analysis(the independent samples t test) were used for statistical analysis.· RESULTS:Complete akinesia(33.3% vs 4.8%,P =0.04),as well as the patients(85.7% vs 57.1%,P =0.04)and surgeon’s satisfaction(87.5% vs 52.4%,P =0.02) were significantly more frequent in LH than in L group.The mean VAS was significantly lower in the same group(1.90±1.45 vs 3.00±1.55,P =0.04).· CONCLUSION:Addition of hyaluronidase to lidocaine solution for sub-Tenon’s anesthesia significantly improves the ocular akinesia,enhances the intra-operative patients and surgeons’ satisfaction,and attenuates the postoperative pain.