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- W4387641105 abstract "In patients with Parkinson’s Disease (PD), two distinct motor subtypes, tremor dominant (TD) and postural instability and gait difficulty (PIGD), can be differentiated using Unified Parkinson’s Disease Rating Scale (UPDRS) sub-scores. This post hoc analysis of pooled data from eight pivotal studies examined the effect of treatment with istradefylline, a selective adenosine A2A receptor antagonist, on these subtypes. In eight randomized, placebo-controlled phase 2b/3 trials, patients on levodopa with carbidopa/benserazide experiencing motor complications received istradefylline (20 or 40mg/day) or placebo for 12 or 16 weeks. TD subtype was defined by the UPDRS II/III items kinetic and postural tremor in right/left hand and (resting) tremor in the face, lips, chin, hands, or feet; PIGD items were freezing, walking, posture, gait, and postural instability. The ratio of mean scores from TD:PIGD items determined subtype (TD [TD:PIGD ratio≥1.5], PIGD [TD:PIGD ratio≤1.0], mixed-type [ratio 1-1.5]). In total, 2719 patients were included (PIGD, n=2165; TD, n=118; mixed-type, n=188; not evaluable, n=248). Among TD subtype patients, the least-squares mean change from baseline versus placebo in UPDRS II/III TD-related total score was significant at 20mg/day istradefylline (-2.21; 95%CI, -4.05 to -0.36; p=0.02). For PIGD subtype patients, there was a significant difference from placebo in UPDRS II/III PIGD-related total score at 40mg/day istradefylline (-0.25; -0.43 to -0.06; p=0.01). The data from this analysis of UPDRS-based motor subtypes suggest that istradefylline can improve motor disability in PD patients with motor fluctuations regardless of PD subtype. Future research should characterize the effects of istradefylline on tremor." @default.
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- W4387641105 date "2023-10-01" @default.
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- W4387641105 title "Istradefylline effects on tremor dominance (TD) and postural instability and gait difficulty (PIGD)" @default.
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- W4387641105 doi "https://doi.org/10.1016/j.prdoa.2023.100224" @default.
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