Not sure I arrive at the same conclusions here... which should be suffixed with 'in LRRK2 mutation carriers'. There are differences between LRRK2 patients and patients with iPD and these differences likely extend into the pre-diagnostic phase too. That said, I think the RBDSQ is prone to significant inaccuracy... at least that is our experience.
Mov Disord. 2015 Sep 14. doi: 10.1002/mds.26413. [Epub ahead of print]
Saunders-Pullman R, Alcalay RN, Mirelman A, Wang C, Luciano MS, Ortega RA, Glickman A, Raymond D, Mejia-Santana H, Doan N, Johannes B, Yasinovsky K, Ozelius L, Clark L, Orr-Utreger A, Marder K, Giladi N, Bressman SB; AJ LRRK2 Consortium.
BACKGROUND:
Rapid eye movement sleep behavior disorder occurs with idiopathic Parkinson's disease (PD) and often precedes PD. Its frequency in LRRK2-PD and utility as a preclinical marker has not been established.
METHODS:
One hundred forty-four idiopathic PD, 142 LRRK2 G2019S mutation PD, 117 non-manifesting carriers, 93 related noncarriers, and 40 healthy controls completed the Rapid eye movement sleep Behavior Disorder Screening Questionnaire.
RESULTS:
Cut scores were met by 30.6% idiopathic PD, 19.7% LRRK2-PD, 6% nonmanifesting carriers, 20.4% related noncarriers, and 15% controls. The likelihood of abnormal scores was decreased in LRRK2-PD versus idiopathic PD (odds ratio = 0.55, P = 0.03), nonmanifesting carriers versus related noncarriers (OR = 0.25, P < 0.01), and PD of less than 3 years' duration, 1 of 19 LRRK2-PD versus 14 of 41 idiopathic PD (P < 0.05).
CONCLUSIONS:
A lower frequency of abnormal questionnaire scores is seen in LRRK2-PD, especially in early LRRK2-PD, and in nonmanifesting carriers. Therefore, the Rapid eye movement sleep Behavior Disorder Questionnaire is unlikely to serve as a preclinical marker for phenoconversion to PD. © 2015 International Parkinson and Movement Disorder Society.
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