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Correlation between cardiac 123I‐MIBG and odor identification in patients with Parkinson's disease and multiple system atrophy

We investigated an association between olfaction and cardiac 123I‐metaiodobenzylguanidine (MIBG) uptake in patients with Parkinson's disease (PD) and multiple system atrophy (MSA). There was a significant positive correlation between cardiac MIBG uptake and the Cross‐Cultural Smell Identification (CCSI) score in patients with PD (r = 0.56; P = 0.003) independent of the disease duration or clinical rating of motor status. However, patients with MSA did not show a significant correlation between cardiac MIBG uptake and the CCSI score. Our findings suggest that the functional losses of the olfactory and cardiac sympathetic systems are closely coupled in PD. © 2006 Movement Disorder Society