Gait dysfunction in Parkinson's disease and normal pressure hydrocephalus: a comparative study

Area of Science:

• Neurology
• Gait Analysis
• Movement Disorders

Background:

• Gait dysfunction is a hallmark of neurological disorders.
• Differentiating gait patterns in Parkinson's disease (PD) and normal pressure hydrocephalus (NPH) is crucial for diagnosis and management.

Purpose of the Study:

• To comparatively characterize and classify gait dysfunction in PD and NPH patients.
• To identify distinct gait features and their association with disease severity.

Main Methods:

• Gait velocity, stride length, cadence, and hypokinetic gait features were assessed using a walking test.
• Equilibrium was evaluated with the shoulder tug test (STT).
• Cluster analysis classified subjects based on gait parameters; PD and NPH patients underwent specific clinical assessments.

Main Results:

• Both NPH and PD patients demonstrated reduced stride length, gait velocity, and STT scores compared to controls.
• NPH patients exhibited worse gait parameters and a higher frequency of frontal and sub-cortical hypokinetic gait features than PD patients.
• A severe/moderate gait dysfunction cluster comprised predominantly NPH patients, while a mild dysfunction cluster included most controls and some PD patients.

Conclusions:

• While PD and NPH share gait characteristics like slowness and small steps, NPH patients present with more severe dysfunction.
• Gait improvement was observed in NPH patients post-lumbar puncture, but did not reach control levels.
• In PD, severe gait impairment correlated with higher motor stage and the akinetic-rigid phenotype.