Short-term outcome of botulinum neurotoxin A injection with or without sodium hyaluronate in the treatment of infantile esotropia-a prospective interventional study

Purpose: To compare the short-term outcome of botulinum neurotoxin A (BoNT-A) with or without sodium hyaluronate in the treatment of infantile esotropia (IE). Methods: In this tertiary care hospital-based prospective, interventional, non-randomized study on infants with IE below one year of age, 25 cases were enrolled in the sodium hyaluronate (SH) group to receive 2.5 U BoNT-A injection combined with SH in each medial rectus muscle (MR). Thirty patients were enrolled in the control group to receive 2.5 U BoNT-A injection with normal saline in each MR. The change in mean primary ocular deviation (POD) and complications were assessed at 2 weeks, 1 month, 3 months, and 6 months post injection. Mann-Whitney U test was used for non-parametric unpaired data. Chi-square test and Fisher's exact test were used to test for the strength of the association between the two categorical variables. Results: Satisfactory ocular alignment was achieved in 76% in SH group and 73% in the control group (P value = 0.80). While the change in mean POD was comparable (29.2 prism diopters [PD] vs 29.3 PD; P value = 0.65), the complication rates were significantly lesser in SH (16% vs 33.3%; P value = 0.14). Conclusion: BoNT-A combined with SH is equally effective with lesser complications as compared to botulinum toxin alone in the treatment of IE.