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From the Departments of Neurological Sciences (Drs. Goetz, Pappert, Stebbins, Ling, and Carvey, and L.M. Blasucci) and Pharmacology (Drs. Goetz, Nora, and Carvey), Rush University/Rush Preshytclrian St. Luke's Medical Center, Chicago, IL.
Address correspondence and reprint requests to Dr. Christophcbr G. Goetz, 1725 W. Harrison Street, Chicago, IL 60612.
In five nondemented Parkinson's disease patients with daily visual hallucinations, we tested whether high-dose IV levodopa (LD) infusions precipitated hallucinations. Two infusion paradigms were studied, each with 1.5—mg/kg hourly dose for 4 hours—steady infusion and pulse infusion of the full hour dose over 5 minutes each hour. In both protocols, plasma LD levels changed significantly during the infusion protocol. The cumulative area under the curve was equivalent for the two infusions. All patients remained alert, and none developed visual hallucinations. The two patients with peak-dose dyskinesias on oral LD developed prominent dyskinesias during the infusion. Visual hallucinations do not relate simply to high levels of LD or to sudden changes in plasma levels.
Received May 15, 1997. Accepted in final form July 2, 1997.
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