[Olfactory function in patients with idiopathic Parkinson's disease]

Area of Science:

• Neurology
• Neuroimaging
• Olfactory Research

Background:

• Olfactory dysfunction is an early non-motor symptom in idiopathic Parkinson's disease (IPD).
• The olfactory bulb (OB) and olfactory sulcus (OS) are key structures in olfactory processing.
• Understanding structural changes in these areas may provide insights into IPD pathophysiology.

Purpose of the Study:

• To investigate the relationship between olfactory bulb volume, olfactory sulcus depth, and olfactory function in IPD patients.
• To compare these parameters between IPD patients and healthy controls.

Main Methods:

• Magnetic resonance imaging (MRI) was used to measure OB volume and OS depth in 100 IPD patients and 100 controls.
• Olfactory function was assessed using T&T olfactory testing.
• Statistical analysis was performed using SPSS software to compare groups and analyze correlations.

Main Results:

• IPD patients exhibited significantly lower average OB volume compared to controls (P < 0.01).
• No significant difference in OS depth was found between IPD patients and controls.
• A negative correlation was observed between olfactory function scores and OB volume in both groups (P < 0.05).
• OB volume correlated with disease severity (UPDRS, H-Y degree) but not disease duration in IPD patients.

Conclusions:

• Reduced olfactory bulb volume is a characteristic finding in idiopathic Parkinson's disease.
• Olfactory bulb volume, not olfactory sulcus depth, correlates with olfactory function deficits in IPD.
• The degree of olfactory dysfunction aligns with disease severity in IPD.