Comparative study of dual-pulsed 1064 nm Q-switched Nd:YAG laser and single-pulsed 1064 nm Q-switched Nd: YAG laser by using zebrafish model and prospective split-face analysis of facial melasma

Background: Recently dual-pulsed low-fluence 1064-nm Q-switched Nd: YAG (QSNY) laser has been developed for reducing complication during melasma treatment. Objective: Comparison of the efficacy and safety between dual-pulsed mode and single-pulsed mode for the treatment of melasma. Materials and methods: In preclinical study, adult zebrafish were irradiated with dual-pulsed and single-pulsed mode. Changes of melanophore and cell death were assessed. In split-face clinical study, dual-pulsed and single-pulsed mode were irradiated on the left and right side of the face, respectively. L* value, clinical digital photos, modified Melasma Area and Severity Index (MASI) scores, and side effects were measured. Results: As compared to single-pulsed mode and dual-pulsed mode with longer intervals, zebrafish melanophore was cleared quickly at dual-pulsed mode with 80-mu sec interval and 0.3 J/cm(2) fluence. Dual-pulsed mode showed the least regeneration of melanophore at 4 weeks after irradiation and no cell death was observed with 80-mu sec interval. Both pulse modes improved melasma significantly but modified MASI score and L* value were not significantly different between each other. Lesser pain and shorter duration of post-laser erythema were observed with dual-pulsed mode. Conclusion: Dualpulsed mode was as effective as single-pulsed mode for the treatment of melasma and revealed less side effects.