Non-vestibular nystagmus and saccadic intrusions

  • Victoria Duque Holguera
    Hospital Clínico Universitario de Valladolid. Servicio de Otorrinolaringología y Cirugía de Cabeza y Cuello. Valladolid. España https://orcid.org/0000-0003-2191-7267 victoriaduhol[at]hotmail.com
  • Jesús Eduardo Ramírez Salas
    Hospital Clínico Universitario de Valladolid. Servicio de Otorrinolaringología y Cirugía de Cabeza y Cuello. Valladolid. España https://orcid.org/0000-0002-7010-9541
  • María Álvarez Álvarez
    Hospital Clínico Universitario de Valladolid. Servicio de Otorrinolaringología y Cirugía de Cabeza y Cuello. Valladolid. España https://orcid.org/0000-0001-9420-0609
  • Juan Losada Campa
    Hospital Clínico Universitario de Valladolid. Servicio de Otorrinolaringología y Cirugía de Cabeza y Cuello. Valladolid. España https://orcid.org/0000-0003-1153-6532
  • Mariana González Sosto
    https://orcid.org/0000-0002-8659-6727
  • María San Millán González
    Hospital Clínico Universitario de Valladolid. Servicio de Otorrinolaringología y Cirugía de Cabeza y Cuello. Valladolid. España https://orcid.org/0000-0003-4894-613X
  • Diana Milena Saboya Romero
    Hospital Clínico Universitario de Valladolid. Servicio de Otorrinolaringología y Cirugía de Cabeza y Cuello. Valladolid. España https://orcid.org/0000-0002-6053-6849

Abstract

Introduction and objective: Nystagmus is a rhythmic and involuntary oscillation of one or both eyes in which a fixation drift and a refixation movement occur. It affects 14-17 out of 10,000 children. There are multiple underlying causes. The objective is to know the different types of non-vestibular nystagmus and non-nystagmic saccadic intrusions, with their characteristics, differential diagnosis, etiologies, diagnosis, and treatment. Method: A narrative bibliographic review has been carried out through the PubMed, Scopus, Google Scholar, and Clinical Key databases. Articles on vestibular nystagmus and clinical cases were excluded. Results: Seventeen articles, book chapters and clinical guidelines of the American Society of Ophthalmology and the Spanish Society of Ophthalmology have been analyzed. Discussion: There are various types of non-vestibular nystagmus that can debut in the pediatric age: infantile nystagmus syndrome, classically called congenital nystagmus, the most frequent; nystagmus syndrome due to maldevelopment of fusion, classically known as latent nystagmus, the second most frequent and related to amblyopia; Spasmus nutans, a syndrome characterized by nystagmus, nodding, and torticollis, the third most frequent; monocular nystagmus such as the Heimann-Bielchowsky phenomenon or myokymia of the superior oblique muscle; alternating periodic nystagmus, which cyclically changes direction, amplitude, and frequency; downbeat nystagmus, most frequent central nystagmus; acquired pendular nystagmus, which may be related to masticatory or palatal disorders; and see-saw nystagmus, with “up and down” eye movement similar to a see-saw. There are also three main types of non-nystagmic saccadic intrusions, which correspond to the opsoclonus syndrome, consisting of disordered multiplanar saccades that can be associated with myoclonus and ataxia; ocular bobbing, with vertical saccadic movements and ocular flutter, with horizontal saccadic movements. Conclusions: The characteristics of the different types of non-vestibular nystagmus and non-nystagmic saccadic intrusions and their possible etiologies should be known, since in a large percentage of cases the underlying cause is serious, frequently neurological. In the same way, we must know how to carry out the diagnosis and the therapeutic options that we have within our reach to improve the quality of life of patients.
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Duque Holguera, V., Ramírez Salas, J. E., Álvarez Álvarez, M., Losada Campa, J., González Sosto, M., San Millán González, M., & Saboya Romero, D. M. (2023). Non-vestibular nystagmus and saccadic intrusions. Revista ORL, e31541. https://doi.org/10.14201/orl.31541

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