Abstract
Background
Despite the primary myelin-related pathophysiology, small fiber neuropathy (SFN) and axonal degeneration are also considered to be involved and associated with disabling symptoms and impaired quality of life in chronic inflammatory demyelinating polyneuropathy (CIDP). Demonstration of SFN usually requires complex or invasive investigations.
Objects
In vivo corneal confocal microscopy (IVCCM) has evolved as a non-invasive, easily applied method for quantification of small fiber involvement in peripheral nerve disorders. We aimed to investigate the potential role of IVCCM in CIDP.
Methods
In this cross-sectional study, 15 patients with CIDP underwent assessment with clinical disability scales, neuropathic pain (NP) and autonomic symptom questionnaires, nerve conduction studies, and IVCCM. IVCCM parameters were analyzed and compared to those from 32 healthy controls.
Results
Corneal nerve fiber density (CNFD) and corneal nerve fiber length (CNFL) were significantly decreased in the CIDP group, compared to those in controls (p = 0.03 and p = 0.024, respectively). Langerhans cells and fiber tortuosity were increased in CIDP patients (p = 0.005 and p = 0.001, respectively). IVCCM parameters were significantly lower in patients with NP compared to those in patients without NP.
Conclusion
IVCCM shows promise as a non-invasive complementary biomarker in the assessment of demyelinating polyneuropathies, providing insights into the potential pathophysiology of these non-length-dependent neuropathies.
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Data Availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Change history
09 March 2023
A Correction to this paper has been published: https://doi.org/10.1007/s10072-023-06741-9
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K.U., E.T., and P.K.K. contributed to the conception and design of the study; E.K.O., S.A.T., H.A., and P.K.K. contributed to the acquisition and analysis of the data; E.K.O., S.A.T., E.T., K.U., H.A., T.T., and P.K.K. contributed to drafting the text or preparing the figures.
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The original online version of this article was revised: The original article contains an error during online publication:
1. Changing the keywords from 'confocal confocal microscopy' to 'corneal confocal microscopy'.
2. Deletion of Fig.3 caption in the body text.
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Keskiner-Ozturk, E., Akkaya-Turhan, S., Toker, E. et al. Corneal nerve fiber involvement in chronic inflammatory demyelinating polyneuropathy. Neurol Sci 44, 2509–2516 (2023). https://doi.org/10.1007/s10072-023-06711-1
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DOI: https://doi.org/10.1007/s10072-023-06711-1