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Visual evoked potential changes following Botox administration in patients with blepharospasm

International Ophthalmology (2023)Cite this article

Abstract

Purpose

To examine visual evoked potential (VEP) changes following botulinum toxin type A (BTA) administration in patients with blepharospasm.

Methods

Patients diagnosed with blepharospasm receiving BTA administration were included in the study. Three groups, a control group and two study groups (patients examined 14 days after BTA administration—Study Group 1, and patients examined 28 days after BTA administration—Study Group 2) were evaluated. Dilated fundus examinations were performed following detailed ophthalmological examinations and VEP tests. Keypoint (Dantec, Denmark) and ISCEV criteria were adopted for pattern VEP (PVEP) recording. BTA was applied in the form of local injections at a total 15–30 units, at 2.5–5 units per injection.

Results

A mean 19.4 ± 3.2 units of BTA was used for each eye. N70 (ms), P100 (ms), and P100 (uV) values were statistically significantly lower in both study groups following drug administrations compared to the control group (p < 0.001 for all). Significant positive correlation was observed between increased P100 amplitudes and age in the control group (p = 0.008, r = 0.200). Significant negative correlation was observed between the BTA units used and decreased P100 amplitudes in both study groups 1 and 2 following drug administrations (p = 0.017, r = − 0.180 and p = 0.043, r = − 0.153, respectively).

Conclusion

VEP may be an important method in the diagnosis and follow-up of blepharospasm and in determining the success of drug administration and additional therapeutic requirements.

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Funding

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Authors and Affiliations

  1. Department of Ophthalmology, Private Neon Hospital, Erzincan, Turkey

    Mehmet Tahir Eski

  2. Department of Ophthalmology, Duzce University Medical School, Duzce, Turkey

    Kuddusi Teberik & Taha Sezer

  3. Department of Neurology, Duzce Ataturk Community Hospital, Duzce, Turkey

    Aziz Hudai Ayasli

  4. Department of Neurology, Istanbul (Duzce University), Liv Hospital Vadi, Istanbul, Turkey

    Ayhan Ozturk

Authors
  1. Mehmet Tahir Eski
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  2. Kuddusi Teberik
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  3. Taha Sezer
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  4. Aziz Hudai Ayasli
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  5. Ayhan Ozturk
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Contributions

"Dr. Eski wrote the main manuscript text and Dr. Teberik prepared tables 1-3. All authors reviewed the manuscript."

Corresponding author

Correspondence to Mehmet Tahir Eski.

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All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers' bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.

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All procedures performed in studies involving human participants were conducted in accordance with the ethical standards of the institutional and/or national research committee (Duzce University Faculty of Medicine) and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.

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Eski, M.T., Teberik, K., Sezer, T. et al. Visual evoked potential changes following Botox administration in patients with blepharospasm. Int Ophthalmol (2023). https://doi.org/10.1007/s10792-023-02639-9

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Keywords

  • Blepharospasm
  • Botulinum toxin
  • Visual evoked potential
  • P100