Comparison of different topical anesthetic methods for intravitreal injections: a randomized crossover study.

BACKGROUND

To evaluate the potential adjunctive effect of pledget anesthetic to topical proparacaine applied in a droplet form in patients undergoing intravitreal injections (IVI).

METHOD

This is a single-centre, prospective, randomized, double-blinded crossover study. 60 patients were included. Patients receiving IVI were given topical 0.5% proparacaine drops then randomized in a 1:1 ratio to receive 0.5% proparacaine soaked pledget or normal saline soaked pledget as placebo. The patients would later be crossed over to receive the alternative intervention. Pain was assessed with a visual analog scale (VAS) and questionnaire immediately afterwards, 10-minutes and 20-minutes after injection.

RESULT

Pain intensity as assessed on the visual analogue scale was lower for the placebo group compared to the pledget group immediately (2.51 cm vs. 2.8 cm), 10-minutes (1.81 cm vs. 2.13 cm) and 20-minutes (1.23 cm vs. 1.65 cm) after injection, however this was not statistically significant (p = 0.48, p = 0.43, p = 0.24 respectively). However, in a subgroup of treatment naïve patients, the addition of pledget anesthesia may lower pain and make IVI more tolerable.

CONCLUSION

Additional pledget soaked with proparacaine does not enhance anesthesia compared to solely using topical proparacaine for IVI, except in a subset of treatment naïve patients.