Valproic acid’s effects on visual acuity in retinitis pigmentosa: a systemic review and Meta-analysis
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Xiang Ma. The First Affiliated Hospital of Dalian Medical University, No. 222 Zhongshan Road, Xigang District, Dalian 116011, Liaoning Province, China. xma9467@vip.sina.com

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Supported by the National Natural Science Foundation of China (No.81770970, No.81271022).

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    Abstract:

    AIM: To gain a better understanding of the overall efficacy of valproic acid (VPA) treatment for retinitis pigmentosa (RP). METHODS: Publications in PubMed, EMBASE, Cochrane Library, Web of Science and Clinicaltrials.gov were searched for clinical trials of patients with RP assigned to treatment with VPA. Patients’ pre- and post-treatment visual field (VF) and best-corrected visual acuity (BCVA) scores were extracted and compared to assess changes. RESULTS: A total of 78 reports were retrieved and 6 studies involving 116 patients were included in the Meta-analysis. The combined results showed a significant decrease in logarithm of minimal angle of resolution (logMAR) scores, calculated using baseline and post-treatment BCVA (P<0.00001, mean difference=-0.05, 95%CI: -0.05, -0.04, I2=36%) scores, which means there was considerable improvement in visual acuity. Meanwhile, more BCVA changes were observed in short-term (≤6mo) treatment studies (P<0.00001, mean difference=-0.05, 95%CI: -0.05, -0.04, I2=38%), studies conducted in Asia (P<0.00001, mean difference=-0.05, 95%CI: -0.05, -0.04, I2=4%), studies with a sample size of 30 or fewer patients (P<0.00001, mean difference=-0.05, 95%CI: -0.05, -0.04, I2=38%) and prospective studies (P<0.00001, mean difference=-0.05, 95%CI: -0.05, -0.04, I2=0%). However, VPA’s effect on VF was inconsistent across studies (P=0.75, mean difference=-22.76, 95%CI: -160.56, 115.05, I2=68%). CONCLUSION: This Meta-analysis reveals that most RP patients who were treated with VPA showed improvement in BCVA. However, its effect on VF remains inconsistent. VPA may be a promising treatment for RP.

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Wen-Jun Chen, Li Ma, Ming-Shu Li, et al. Valproic acid’s effects on visual acuity in retinitis pigmentosa: a systemic review and Meta-analysis. Int J Ophthalmol, 2019,12(1):129-134

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Publication History
  • Received:June 02,2018
  • Revised:September 18,2018
  • Adopted:
  • Online: January 03,2019
  • Published: