Effect of Trigeminal Nerve Stimulation on Corneal Nerves and Chronic Ocular Pain

Dry Eye Clinical Trial

Official title:

Effect of Trigeminal Nerve Stimulation on Subbasal Corneal Nerve Plexus Density and Chronic Ocular Pain in Patients With Dry Eye

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT04648085
• Other study ID #: CI-006-2020
• Status: Completed
• Phase: N/A
• Start date: February 3, 2021
• Est. completion date: December 10, 2021

Study information

• Verified date: January 2022
• Source: Instituto de Oftalmología Fundación Conde de Valenciana
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Individuals with dry eye tend to present with ocular pain which persists despite the use of topical treatment. This could be secondary to somatosensory impairment attributable to neuropathic pain. The purpose of this study is to evaluate the effect of trigeminal nerve stimulation (TNS) on corneal nerves and chronic ocular pain in patients with dry eye.

Description:

Dry eye is a multifactorial disease that produces a variety of clinical manifestations including, dryness, pain, blurred vision, and sensitivity to light or wind. Differences have been noted between the symptoms reported and the signs presented on physical examination, which suggests the involvement of somatosensory impairment. Ocular neuropathic pain is characterized by burning pain, hyperalgesia, photophobia, and sensitivity to wind. There are common physiopathological pathways, suggesting that corneal nerve sensitization contributes to the development of dry eye symptoms. Furthermore, in vivo confocal microscopy has reported a decrease in the density of the subbasal plexus in patients with a neuropathic component and dry eye, suggesting that they are not mutually exclusive conditions. Various topical treatments, as well as systemic medications are known to manage eye pain and dry eye. However, in some cases, individuals have been refractory to them, enhancing the importance of research in adjuvant therapies such as TNS. This research protocol evaluates the effect of transcutaneous stimulation on corneal subbasal plexus density and chronic eye pain in patients with dry eye. A complete dry eye examination will be performed, including completion of Ocular Surface Disease Index (OSDI) and Dry Eye Questionnaire-5 (DEQ-5). Subbasal nerves density will be measured by confocal microscopy before and after receiving treatment with TNS. In addition, monthly monitoring of the intensity of ocular pain (with a numerical scale of 0-10) will be maintained. The intensity and severity of the clinical variables will be compared before and after receiving the treatment with a paired t-test considering a value of p<0.05 as statistically significant.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 7
• Est. completion date: December 10, 2021
• Est. primary completion date: December 10, 2021
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Individuals with dry eye, Ocular pain for more than 3 months, Contact lens users, Individuals using topical treatment and/or systemic medication for dry eye syndrome, Individuals with history of photo-ablative ocular surgery (Laser-assisted in situ keratomileusis (LASIK) , Photorefractive keratectomy (PRK), Small incision lenticule extraction(SMILE), Individuals with history of autoimmune disease (Lupus, Rheumatoid Arthritis, Sjögrens),

Exclusion Criteria:

• Individuals with pacemakers or implantable defibrillators, Individuals with diagnosis of epilepsy, History of facial trauma one month prior to recruitment, Acute facial pain with unknown etiology, History of ocular surgery one month prior to recruitment, Trigeminal neuralgia, Active Herpes Zoster Ophthalmicus,

Related Conditions & MeSH terms

• Dry Eye
• Dry Eye Syndromes
• Eye Pain
• Keratoconjunctivitis Sicca
• Neuralgia
• Neuropathic Pain

Intervention

Device:
• Trigeminal Nerve Stimulation
Applied to to the forehead using a self-adhesive electrode positioned bilaterally over the upper branches of the trigeminal nerve.The device generates electrical impulses allowing to stimulate the trigeminal nerve.

Locations

Country	Name	City	State
Mexico	Instituto de Oftalmología Conde de Valenciana	Mexico City	Cdmx

Sponsors (1)

Lead Sponsor	Collaborator
Instituto de Oftalmología Fundación Conde de Valenciana

Country where clinical trial is conducted

Mexico, 

References & Publications (22)

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Crane AM, Feuer W, Felix ER, Levitt RC, McClellan AL, Sarantopoulos KD, Galor A. Evidence of central sensitisation in those with dry eye symptoms and neuropathic-like ocular pain complaints: incomplete response to topical anaesthesia and generalised heightened sensitivity to evoked pain. Br J Ophthalmol. 2017 Sep;101(9):1238-1243. doi: 10.1136/bjophthalmol-2016-309658. Epub 2017 Jan 18. — View Citation

De Paiva CS, Corrales RM, Villarreal AL, Farley WJ, Li DQ, Stern ME, Pflugfelder SC. Corticosteroid and doxycycline suppress MMP-9 and inflammatory cytokine expression, MAPK activation in the corneal epithelium in experimental dry eye. Exp Eye Res. 2006 Sep;83(3):526-35. Epub 2006 Apr 27. — View Citation

Dworkin RH, O'Connor AB, Kent J, Mackey SC, Raja SN, Stacey BR, Levy RM, Backonja M, Baron R, Harke H, Loeser JD, Treede RD, Turk DC, Wells CD. Interventional management of neuropathic pain: NeuPSIG recommendations. Pain. 2013 Nov;154(11):2249-2261. doi: 10.1016/j.pain.2013.06.004. Epub 2013 Jun 6. Review. — View Citation

Farhangi M, Feuer W, Galor A, Bouhassira D, Levitt RC, Sarantopoulos CD, Felix ER. Modification of the Neuropathic Pain Symptom Inventory for use in eye pain (NPSI-Eye). Pain. 2019 Jul;160(7):1541-1550. doi: 10.1097/j.pain.0000000000001552. — View Citation

Galor A, Feuer W, Lee DJ, Florez H, Venincasa VD, Perez VL. Ocular surface parameters in older male veterans. Invest Ophthalmol Vis Sci. 2013 Feb 19;54(2):1426-33. doi: 10.1167/iovs.12-10819. — View Citation

Galor A, Moein HR, Lee C, Rodriguez A, Felix ER, Sarantopoulos KD, Levitt RC. Neuropathic pain and dry eye. Ocul Surf. 2018 Jan;16(1):31-44. doi: 10.1016/j.jtos.2017.10.001. Epub 2017 Oct 12. Review. — View Citation

Kalangara JP, Galor A, Levitt RC, Covington DB, McManus KT, Sarantopoulos CD, Felix ER. Characteristics of Ocular Pain Complaints in Patients With Idiopathic Dry Eye Symptoms. Eye Contact Lens. 2017 May;43(3):192-198. doi: 10.1097/ICL.0000000000000249. — View Citation

Karson CN, Burns RS, LeWitt PA, Foster NL, Newman RP. Blink rates and disorders of movement. Neurology. 1984 May;34(5):677-8. — View Citation

Kinard KI, Smith AG, Singleton JR, Lessard MK, Katz BJ, Warner JE, Crum AV, Mifflin MD, Brennan KC, Digre KB. Chronic migraine is associated with reduced corneal nerve fiber density and symptoms of dry eye. Headache. 2015 Apr;55(4):543-9. doi: 10.1111/head.12547. Epub 2015 Mar 31. — View Citation

Martinez JD, Galor A, Ramos-Betancourt N, Lisker-Cervantes A, Beltrán F, Ozorno-Zárate J, Sánchez-Huerta V, Torres-Vera MA, Hernández-Quintela E. Frequency and risk factors associated with dry eye in patients attending a tertiary care ophthalmology center in Mexico City. Clin Ophthalmol. 2016 Jul 21;10:1335-42. doi: 10.2147/OPTH.S106451. eCollection 2016. — View Citation

Matsumoto Y, Ibrahim OMA. Application of In Vivo Confocal Microscopy in Dry Eye Disease. Invest Ophthalmol Vis Sci. 2018 Nov 1;59(14):DES41-DES47. doi: 10.1167/iovs.17-23602. Review. — View Citation

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Patel DV, McGhee CN. Mapping of the normal human corneal sub-Basal nerve plexus by in vivo laser scanning confocal microscopy. Invest Ophthalmol Vis Sci. 2005 Dec;46(12):4485-8. — View Citation

Sivanesan E, Levitt RC, Sarantopoulos CD, Patin D, Galor A. Noninvasive Electrical Stimulation for the Treatment of Chronic Ocular Pain and Photophobia. Neuromodulation. 2018 Dec;21(8):727-734. doi: 10.1111/ner.12742. Epub 2017 Dec 28. — View Citation

Small LR, Galor A, Felix ER, Horn DB, Levitt RC, Sarantopoulos CD. Oral Gabapentinoids and Nerve Blocks for the Treatment of Chronic Ocular Pain. Eye Contact Lens. 2020 May;46(3):174-181. doi: 10.1097/ICL.0000000000000630. — View Citation

Tavakoli M, Hossain P, Malik RA. Clinical applications of corneal confocal microscopy. Clin Ophthalmol. 2008 Jun;2(2):435-45. — View Citation

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Zayan K, Aggarwal S, Felix E, Levitt R, Sarantopoulos K, Galor A. Transcutaneous Electrical Nerve Stimulation for the Long-Term Treatment of Ocular Pain. Neuromodulation. 2020 Aug;23(6):871-877. doi: 10.1111/ner.13146. Epub 2020 Mar 20. — View Citation

Zhang M, Chen J, Luo L, Xiao Q, Sun M, Liu Z. Altered corneal nerves in aqueous tear deficiency viewed by in vivo confocal microscopy. Cornea. 2005 Oct;24(7):818-24. — View Citation

* Note: There are 22 references in all — Click here to view all references

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Identify the effect of trigeminal nerve stimulation on chronic eye pain in patients with dry eye.	Eye pain will be evaluated prior to the use of trigeminal nerve stimulation using a numeric pain scale ranging from 0-10, "0" indicating no pain and "10" indicating the most severe pain imaginable.; Pain will be evaluated posterior to therapy with trigeminal nerve stimulation with the same scale during monthly follow up.	From three-six months
Primary	Identify the effect of trigeminal nerve stimulation on subbasal corneal nerve plexus density in patients with dry eye.	Initial subbasal corneal nerve plexus density will be measured prior to therapy with with in vivo confocal microscopy.; Density measurements will be repeated every two months with in vivo confocal microscopy posterior to trigeminal nerve stimulation use.	2 months- 6 months