PubMed · 5800333
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M J Raymond. 1969. Aversion therapy for sexual deviations.. https://doi.org/10.1192/bjp.115.525.979-a
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A decreased motor response after repeated doses of apomorphine is observed in severely affected Parkinson's disease patients. We simultaneously studied clinical symptoms and internal pallidus single unit activity in three parkinsonian patients underlying stereotaxic neurosurgery for deep brain stimulation. In each patient, two closely spaced doses of intraoperatory apomorphine were administered, while recording the same extracellular unit. The reduced clinical effect of the second administration was correlated to a lessened inhibition of the pallidal single unit recorded throughout the double administration. Our data support the proposition that fast postsynaptic desensitization to dopamine agonists may take place in the basal ganglia nuclei and play a role in the physiopathology of levodopa long-term treatment syndrome.
Dopamine agonists have been used in the treatment of Parkinson's disease (PD) since the mid 1970s. With the approval of two new agents in 1997, the number available in the United States is up to four; bromocriptine, pergolide, pramipexole, ropinirole. These agents differ in dopamine receptor affinities and chemical structure, which, in turn, may possibly result in differences in efficacy tolerability and safety. Dopamine have historically been used in combination with levodopa in patients with advanced PD, but indicators are now expanding. With is expansion comes increasing controversy. This article reviews dopamine receptor pharmacology and the results of the clinical trials that have used for agonists available in the United States as well as a discussion of three minor agonists.
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