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Time course of loss of clinical benefit following withdrawal of levodopa/carbidopa and bromocriptine in early Parkinson's disease
Author(s) -
Hauser Robert A.,
Koller William C.,
Hubble Jean P.,
Malapira Teresita,
Busenbark Karen,
Olanow C. Warren
Publication year - 2000
Publication title -
movement disorders
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.352
H-Index - 198
eISSN - 1531-8257
pISSN - 0885-3185
DOI - 10.1002/1531-8257(200005)15:3<485::aid-mds1010>3.0.co;2-f
Subject(s) - bromocriptine , carbidopa , levodopa , discontinuation , medicine , selegiline , parkinson's disease , disease , degenerative disease , rating scale , central nervous system disease , psychology , prolactin , hormone , developmental psychology
Putative neuroprotective agents for Parkinson's disease can be assessed in untreated patients using progression of clinical disability as an index of disease progression. To avoid the confound associated with symptomatic therapy, progression of the underlying disease can be assessed by evaluating the progression of clinical disability from an untreated baseline to a final visit following wash‐out of symptomatic medication. In this type of analysis it is critical to use a wash‐out of sufficient duration to ensure elimination of symptomatic effects. To assess the time course of resolution of symptomatic effects, we evaluated 31 patients at days 1, 8, and 15 following discontinuation of levodopa/carbidopa and bromocriptine. Mean total Unified Parkinson's Disease Rating Scale scores (± standard error) increased (worsened) by 7.4 ± 1.5 from day 1 to day 15 (p <0.0001), 4.5 ± 1.2 from day 1 to day 8 (p = 0.0009), and 2.9 ± 1.0 from day 8 to day 15 (p = 0.01). We conclude that a wash‐out of at least 2 weeks is required to eliminate the symptomatic effects of levodopa/carbidopa and bromocriptine in patients with early Parkinson's disease.