Neurogenic Orthostatic Hypotension in Parkinson Disease-A Narrative Review of Diagnosis and Management.

Neurogenic orthostatic hypotension (NOH) is a significant non-motor manifestation of Parkinson's disease (PD), that substantially affects patient disability and has a powerful impact on the quality of life of PD patients, while also contributing to increased healthcare costs. This narrative review aims to summarize key insights into the diagnosis and management of NOH in individuals with PD. For diagnosing NOH, a recently introduced and valuable metric is the ΔHr/ΔSBP index. Additional tools, such as autonomic reflex testing and various blood tests, also can be used to help distinguish orthostatic hypotension (OH) from NOH. Treatment strategies for NOH involve both non-pharmacological and pharmacological approaches. As NOH frequently coexists with other abnormal blood pressure patterns (supine hypertension, nocturnal hypertension, and non-dipping hypertension), its treatment can be a challenge for the clinician. Droxidopa and midodrine are the primary pharmacological agents for NOH, though emerging therapies, such as norepinephrine transporter inhibitors, are being investigated. Despite these advancements, further research is needed to better understand the underlying pathophysiology of NOH, enabling more tailored and effective treatment options for individuals with PD.