Subcutaneous foslevodopa in akinetic crisis. A case report from the neurological intensive care unit.

Introduction: Akinetic crisis is a severe deterioration of motor performance occurring in syndromes with pre- or postsynaptic dopaminergic deficit, necessitating effective dopamine replacement therapy. The subcutaneously applicable levodopa derivative foslevodopa represents a new therapeutic option for patients with advanced Parkinson's disease as a continuous therapy. However, its potential role as a parenteral treatment option for akinetic crisis has not been investigated, yet. The case: A 78 year-old patient who had developed akinetic-rigid symptomatology in the context of normal pressure hydrocephalus was admitted to our intensive care unit after experiencing an acute exacerbation of akinesia in the context of pulmonary infection. Off-label administration of subcutaneous foslevodopa was initiated after repeated failures to insert a gastric tube for enteral application of levodopa and contraindications against amantadine and apomorphine. Results: Following the administration of a subcutaneous test dose, continuous application of foslevodopa via a B. Braun syringe pump was gradually increased to 0.3 mL/h during the daytime and 0.15 mL/h at night, corresponding to a levodopa equivalent dosage of 1,020 mg/d. This was accompanied by an improvement of the MDS-UPDRS III score from 85 points to 59 points after 72 h. Discussion: Treatment of an akinetic crisis with subcutaneous foslevodopa in an intensive care unit setting has proven to be safe and effective in a patient with acute akinesia associated with dopamine-sensitive hydrocephalus. Due to the pathophysiological distinction from Parkinson's disease, there may be differences in therapeutic response and side effects. Nevertheless, the method used here can serve as a protocol basis for the treatment of akinetic crises with foslevodopa in general and as a starting point for further research.