Publication date: Available online 7 June 2016
Source:Clinical Therapeutics
Author(s): Mansoor Ahmed, Ryan Hays, J. Steven Poceta, Mark J. Jaros, Richard Kim, Gwendoline Shang
PurposeFew studies have investigated restless legs syndrome (RLS) treatment effects on individual International RLS Study Group Rating Scale (IRLS) items. We assessed the effects of gabapentin enacarbil (GEn) on individual IRLS items and their correlation with sleep disturbances in adults with moderate-to-severe primary RLS.MethodsData were pooled from the randomized, double-blind, placebo-controlled, 12-week studies of XP052, XP053, and XP081 for adults who received GEn (600 or 1200 mg) or placebo once daily. Adults had primary RLS, IRLS total score ≥15, and RLS symptoms >15 days during the month before screening and for ≥4 of the 7 consecutive evenings at baseline. End points included mean change from baseline to week 12 in individual IRLS and post-sleep questionnaire (PSQ) items. For IRLS items, least squares mean treatment differences were calculated from a mixed model for repeated measures. For PSQ items, Cochran–Mantel–Haenszel row mean scores tests with integer scoring were used. Correlations between IRLS and PSQ items were assessed by Spearman's rank coefficients. Safety profile outcomes included treatment-emergent adverse events (TEAEs) and serious TEAEs.FindingsThe modified intent-to-treat population included 671 patients (GEn 600 mg = 161; GEn 1200 mg = 266; placebo = 244). GEn significantly improved mean [SE] differences versus placebo for all IRLS items at week 12, including severity of sleep disturbance (GEn 600 mg, −0.4 [0.10]; GEn 1200 mg, −0.4 [0.09]), daytime tiredness (−0.4 [0.09]; −0.4 [0.08]), RLS severity (−0.4 [0.10]; −0.3 [0.08]), impact on daily affairs (−0.3 [0.07]; −0.3 [0.07]), and mood disturbance (−0.2 [0.07]; −0.3 [0.06]); all P<0.001). For PSQ items, significant (P<0.01) improvements occurred with both GEn doses versus placebo at week 12. The correlations between IRLS and PSQ items for change from baseline to week 12 were moderate to strong, and all correlations were significant (P<0.001). The most frequent TEAEs were somnolence (GEn 600 mg, 20%; GEn 1200 mg, 23%; placebo, 5%) and dizziness (GEn 600 mg, 14%; GEn 1200 mg, 22%; placebo, 5%).ImplicationsGEn significantly improved individual IRLS items and sleep disturbance versus placebo. Correlations between IRLS and PSQ items were moderate to strong. This was not a formal meta-analysis and was not powered to compare the GEn doses. Nevertheless, our study finds that the benefits of GEn extend to individual IRLS items and supports the importance of sleep quality in RLS treatment. ClinicalTrials.gov identifiers: NCT00298623, NCT00365352, and NCT01332305.
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Τετάρτη 8 Ιουνίου 2016
Effect of Gabapentin Enacarbil on Individual Items of the International Restless Legs Study Group Rating Scale and Post-Sleep Questionnaire in Adults with Moderate-to-Severe Primary Restless Legs Syndrome: Pooled Analysis of 3 Randomized Trials
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