A thorn in the side of those that believe hyposmia should form part of the clinical criteria for PD... my feeling this that this proportion is about correct... of course tremor is only a little bit more common...
Mov Disord. 2016 Jun 9. doi: 10.1002/mds.26687. [Epub ahead of print]
Rossi M, Escobar AM, Bril A, Millar Vernetti P, De Palo JI, Cerquetti D, Merello M.
BACKGROUND:
Normosmic Parkinson's disease (PD) might be a unique clinical phenotype with a more benign course when compared with hyposmic PD.
OBJECTIVE:
The objective of this study was to evaluate motor features and the acute levodopa response according to olfactory function.
METHODS:
A total of 169 de novo PD patients that underwent olfactory testing and acute levodopa challenge for clinical prediction of sustained long-term dopaminergic response were evaluated.
RESULTS:
The overall frequency of normosmia was 33%. Normosmic PD patients scored nonsignificantly different to hyposmic/anosmic patients on motor scale and on degree of improvement with levodopa. Motor scores at follow-up were comparable among groups.
CONCLUSIONS:
Normal olfactory function is common in early PD and was not associated with a different motor phenotype when compared with PD patients with olfactory dysfunction.
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