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Long-term Follow-up of Impulse Control Disorders in Parkinson's Disease
E Mamikonyan, AD Siderowf, JE Duda, MN Potenza, S Horn, MB Stern, D Weintraub
Movement Disorders 2007;22: Epub ahead of print

Reducing dopamine agonist use reliably improves impulse control disorders,
according to this study.

Eighteen PD patients with impulse control disorder (ICD), either active or in
remission, were identified from a study database. Fifteen were available for
a follow-up interview by phone (Time 2), conducted at a mean of 29 months
after initial ICD diagnosis or time of maximum ICD symptoms (Time 1).
Patients answered questions on the Minnesota Impulse Disorder Interview and
semi-structured clinical interview, including a self-rating of change in ICD
symptoms.

At Time 1, all patients were taking a dopamine agonist. Patients reported
compulsive gambling (8), sexuality (7), and buying (3). At Time 2, 7 patients
had stopped using an agonist, 5 had decreased their DA dose, and 3 had no
change. Patients reducing DA dose increased their use of levodopa by a
corresponding amount. Mean UPDRS scores did not change between Times 1 and 2.

All patients who stopped using DAs experienced complete remission of ICD
symptoms. Patients who decreased their DA dose had either full or partial
remission. Of the 3 patients who did not change their DA dose, 1 remained
fully symptomatic, 1 had partial remission, and 1 had full remission.

The authors conclude, "For patients who develop and ICD in the context of DA
treatment, discontinuing or significantly decreasing DA exposure, even when
offset by an increase in levodopa treatment, is associated with remission of
or significant reduction in ICD behaviors without worsening of motor
symptoms."

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