Refereed journal article or data article (A1)

Reappearance of Symptoms after GPi-DBS Discontinuation in Cervical Dystonia




List of AuthorsHonkanen Emma A, Korpela Jaana, Pekkonen Eero, Kaasinen Valtteri, Reich Martin M, Joutsa Juho

PublisherWILEY

Publication year2021

JournalMovement Disorders Clinical Practice

Journal name in sourceMOVEMENT DISORDERS CLINICAL PRACTICE

Journal acronymMOV DISORD CLIN PRAC

Volume number8

Issue number3

Start page406

End page411

Number of pages6

ISSN2330-1619

DOIhttp://dx.doi.org/10.1002/mdc3.13162

URLhttps://doi.org/10.1002/mdc3.13162

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/53415823


Abstract
Background: Deep brain stimulation of the globus pallidus interna (GPi-DBS) is a highly efficacious treatment for cervical dystonia. Typically, the treatment response is delayed, appearing and increasing even months after implantation. However, it is not known how fast the symptoms reappear and whether there is a long-term therapeutic effect after the stimulation is discontinued.Objectives: To study symptom reappearance after switching GPi-DBS off in cervical dystonia.Methods: Twelve patients with bilateral GPi-DBS were included in the study. The Toronto Western Spasmodic Torticollis Rating Scale (TWSTRS) was evaluated during the study with DBS stimulation on, after switching the stimulation off and 2 days after the stimulation was switched off. Presurgical symptom severity and best postsurgical response were extracted from the hospital records.Results: At the time of the investigation, GPi-DBS was associated with 67 (SD 39)% symptom improvement of presurgical symptoms severity (P = 0.001). Symptom improvement decreased to 27 (53)% (P = 0.046) (n = 12) acutely after switching the stimulation off and was further reduced to 4 (56)% 2 days after discontinuation (P = 0.01) (n = 11), reaching the presurgical level (P = 0.42). In descriptive analyses, older age was associated with faster worsening of symptoms (P < 0.05). Presurgical symptoms severity, stimulation parameters or magnitude of treatment response did not predict symptom worsening. All but one patient tolerated 2 days DBS switched off.Conclusions: The results provide novel information about the time frame and severity of symptom worsening after discontinuing GPi-DBS in cervical dystonia. Symptoms partially reappear immediately after discontinuing GPi-DBS and full presurgical symptom severity is reached within 2 days.

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Last updated on 2022-07-04 at 18:26