Jason L Chan, Ashley E Rawls, Joshua K Wong, Penelope Hogarth, Justin D Hilliard, Michael S Okun
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Patient Selection for Deep Brain Stimulation for Pantothenate Kinase-Associated Neurodegeneration.
Clinical vignette: A 23-year-old woman with pantothenate kinase-associated neurodegeneration (PKAN) presented with medication-refractory generalized dystonia and an associated gait impairment.
Clinical dilemma: Bilateral globus pallidus internus (GPi) deep brain stimulation (DBS) can be an effective treatment for dystonia. However, outcomes for PKAN DBS have been variable and there are no standardized criteria for patient selection.
Clinical solution: Bilateral GPi DBS implantation resulted in improvement in dystonia and gait. The benefit has persisted over one year after implantation.
Gap in knowledge: PKAN is a rare neurodegenerative disorder and evidence supporting the use of PKAN DBS has been largely limited to case reports and case series. Consequently, there is a paucity of long-term data, especially on gait-related outcomes.
Expert commentary: The clinical characteristics of dystonia that respond to DBS tend to respond in PKAN. Clinicians counselling patients about the effects of DBS for PKAN should thoughtfully discuss gait and postural instability as important aspects to consider, especially as the disease will progress post-DBS.
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