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A dose-ranging study of pramipexole for the symptomatic treatment of restless legs syndrome: Polysomnographic evaluation of periodic leg movements and sleep disturbance - Source: Sleep Medicine, Jan 24, 2009

  [ 16 votes ]   [ 1 Comment ]
By Leni Jama, et al. • www.ProHealth.com • January 28, 2009


[Note: Pramipexole, trade name Mirapex, is thought to stimulate dopamine signals in the part of the brain involved in regulation of body movement.]

Objective: To evaluate, both polysomnographically and by subjective scales, the efficacy and safety profile of pramipexole for restless legs syndrome (RLS) via a 3-week, double-blind, placebo-controlled, parallel-group, dose-ranging study.

Methods: At baseline and after 3 weeks, periodic limb movements (PLM) and sleep parameters were assessed by polysomnography, and patients self-assessed their sleep disturbance and overall RLS severity using the international RLS study group rating scale (IRLS). Four pramipexole doses were evaluated: 0.125, 0.25, 0.50, and 0.75mg/d. Data from 107 patients were included in the intent-to-treat (ITT) analysis.

Results:
For pramipexole recipients, the primary outcome measure, periodic limb movements (PLM) per hour in bed asleep or awake (the PLM index, or PLMI), decreased by a median of -26.55 to -52.70 depending on dosage group, vs. -3.00 for placebo (p<0.01 or 0.001 for each group vs. placebo; Wilcoxon-Mann-Whitney test).

Improvements in the secondary endpoints of PLM while asleep and while awake were also significantly superior for pramipexole.

At 3 weeks, all pramipexole doses reduced the median for PLM while asleep to levels considered normal (less than 5 periodic limb movements per hour).

Except for delta-sleep time and awakenings/arousals, sleep parameters remained unchanged or favored pramipexole. Median sleep latency was reduced by -5.00 to -11.75min in the pramipexole groups, vs. -2.00 for placebo (p<0.05 for all groups except 0.25mg/d). Median total sleep time increased by 25.75-66.75min, vs. 25.50 (p<0.05 for 0.50mg/d), and median time in stages 2-4/rapid eye movement (REM) sleep increased by 37.00-68.00min, vs. 26.75 (p<0.05 for 0.50mg/d).

By subjective IRLS ratings, all pramipexole doses were significantly superior to placebo.

Safety analysis demonstrated no dose-dependent increase in adverse events, and no drug-related increase in daytime somnolence was observed.

Conclusions: Pramipexole is effective and well tolerated in RLS, most notably among objective measures, for reducing PLM and decreasing sleep latency. Although other sleep parameters showed lesser, usually insignificant change, patients' subjective ratings of RLS severity and sleep disturbance were significantly improved (p0.0023).

Source: Sleep Medicine, Jan 24, 2009. [E-Pub ahead of print] PMID: 19171500, by Jama L, Hirvonen K, Partinen M, Alakuijala A, Hublin C, Tamminen I, Koester J, Reess J. Skogby Sleep Clinic, Rinnekoti Research Centre, Espoo, Finland; Department of Neurology, University of Helsinki, Helsinki, Finland. [E-mail: leni.jama@rinnekoti.fi]





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Article Comments Post a Comment

I'm a bit confused
Posted by: CeeQueue
Feb 18, 2009
This report seems to use the terms PLM and RLS interchangeably. I've always been told these are very different disorders. Are they saying this drug treats both, or are they mixing up the terms?
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