Abstract
Botulinum toxin (BT) therapy is the treatment of choice for blepharospasm (BPS). Currently available BT type A drugs include Botox®, Dysport® and Xeomin®. Until now, there are few long-term studies on BT therapy for BPS. This is the first long-term study comparing all three major BT drugs. We collected treatment, efficacy and adverse effect data on BPS patients treated with either Botox®, Dysport® or Xeomin® for at least eight consecutive treatments. Two hundred and eighty-eight patients (208 females, 80 males, age 62 ± 12 years) were included in this study. The treatment time was 11.2 ± 4.1 years covering 10,701 injection series. Doses were 47 ± 10 MU for Botox®, 120 ± 35 MU for Dysport® and 62 ± 11 MU for Xeomin® (Botox® dose vs Xeomin® dose: p < 0.001, unpaired t test). 85 % of all patients had stable doses. The onset of the therapeutic effect was after 6.1 ± 3.3 days and its duration lasted 10.2 ± 3.5 weeks. The Global Clinical Improvement (GCI, 0 = no, 1 = slight, 2 = moderate, 3 = marked improvement in severity and function) as estimated by the patient was 2.5 ± 0.6. It was stable in 90 % of the patients. Adverse effect frequency was 3.0 % (ptosis 2.3 %, dry eye 0.5 %, diplopia 0.2 %). None of these findings was significantly different between Botox®, Dysport® and Xeomin®. Our study, one of the largest studies on BT therapy of BPS and the study with the longest follow-up, confirms that BT therapy produces robust clinical improvement which is stable throughout the treatment time. Therapeutic effects start after 6.1 days and last for about 10 weeks before they start to vanish. With this, they are approximately 2 weeks shorter than the recommended inter-injection interval. Adverse effects were rare, mild and always transient. BT therapy is a safe and effective treatment for BSP. Shorter inter-injection intervals may improve therapeutic results.
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Kollewe, K., Mohammadi, B., Köhler, S. et al. Blepharospasm: long-term treatment with either Botox®, Xeomin® or Dysport® . J Neural Transm 122, 427–431 (2015). https://doi.org/10.1007/s00702-014-1278-z
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DOI: https://doi.org/10.1007/s00702-014-1278-z