Abstract
The autonomic nervous system appears to be uniquely susceptible to degeneration in disorders of α-synuclein pathology. Clinically, autonomic dysfunction in these disorders manifests as neurogenic orthostatic hypotension (nOH), a condition that results in substantial morbidity and mortality. nOH results from pathology affecting either the central autonomic pathways or peripheral autonomic nerve fibers. Determining the localization and pathophysiology of nOH is critical in effectively managing this disorder and selecting appropriate treatment options. In this review, we discuss the pathophysiology of nOH with respect to the various α-synuclein-related neurodegenerative conditions. We highlight the associated clinical features, including gait instability, rapid eye movement behavior disorder, and hyposmia. We also review the current pharmacologic treatment options for nOH. Overall, the goals of therapy are to improve symptoms and prevent syncope and falls. Non-pharmacologic interventions should be introduced first, followed by carefully selected pharmacologic therapies. Treatment decisions should be directed by an understanding of the underlying pathophysiology, as well as the comorbidities and potential contributing factors present in each individual patient.
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The authors of this paper would like to thank Miss Margot Samson for her help in compiling this manuscript.
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Katherine E. McDonell declares that she has no conflict of interest.
Cyndya A. Shibao receives grant support from the National Institutes of Health (K23 HL103976), PhRMA Foundation Career Development Award, and the Doris Duke Clinical Scientist Career Development Award. Dr. Shibao is also a consultant for Lundbeck Pharmaceuticals.
Daniel O. Claassen received grant support from the National Institutes of Health (K23 NS080988) and the Michael J. Fox Foundation and is a consultant for Lundbeck Pharmaceuticals. Dr. Claassen has also received honoraria for speaking and advisory board participation from Lundbeck Pharmaceuticals; this work was related to droxidopa.
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McDonell, K.E., Shibao, C.A. & Claassen, D.O. Clinical Relevance of Orthostatic Hypotension in Neurodegenerative Disease. Curr Neurol Neurosci Rep 15, 78 (2015). https://doi.org/10.1007/s11910-015-0599-0
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DOI: https://doi.org/10.1007/s11910-015-0599-0