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OBJECTIVES Sleep disorders and depression are frequent in patients with Parkinson's disease (PD). However, the exact prevalence and the causality are still unknown. PATIENTS AND METHODS We interviewed 56 consecutive PD patients and 59 age-matched healthy controls concerning sleep disorders and depression. Sleep Disorders Questionnaire (SDQ) and Zung(More)
Evaluation of the accuracy of eye turns (saccades) to fix a jerky pointed stimulus, and smooth pursuit of slow linear and sinusoidal movements of both pointed and optokinetic stimuli was performed in 31 cosmonauts on flight days 2-3, 5-8, 30, and once in one or two months of mission. An additional investigation of the eye pursuit function involved 10(More)
The cocaine derivative [123I] beta-CIT binds with high affinity to dopamine uptake sites in the striatum and can be used to visualize dopaminergic nerve terminals in vivo in the human brain with SPECT. It has been validated that the calculation of a simple ratio of specific/nondisplaceable binding during a period of binding-equilibrium in the striatum about(More)
Technetium-99m hexamethylpropyleneamineoxime ([99mTc]HM-PAO) brain single photon emission computed tomography (SPECT) was performed with a dual head rotating scintillation camera. Normal tracer distribution and side/side differences of counting rates were obtained in 11 healthy volunteers. Almost stable gray/white matter ratios were found (1.97-2.1) in one(More)
In the present study, two different physiological parameters were measured to describe brain activity related to visuomotor learning: performance-related DC-potential shifts and regional cerebral blood flow (rCBF) by Tc-99m HMPAO brain SPECT (Single Photon Emission Computerized Tomography). Visuomotor learning was required in a conflicting situation: a(More)
Single-photon emission computed tomography with N-isopropyl[123I]-p-iodoamphetamine (IMP-SPECT) was performed in 14 normal volunteers (seven men and seven women aged 25.1 +/- 5.3 years) and 29 patients with cerebrovascular disease (18 men and 11 women aged 54.1 +/- 13.7 years). The fluid microsphere model was used to estimate cerebral blood flow (CBF).(More)
We report on three patients who presented a rare, uniform clinical syndrome consisting of ocular flutter and truncal ataxia. In all patients the symptoms followed an upper respiratory infection and resolved without sequelae within a few weeks. Previous reports have emphasized the apparent relationship of this entity to infectious disease, but the infectious(More)
Only recently it has become possible to label and visualize dopamine D2 receptors in the living human brain using an [123I]labeled ligand and the SPECT technique. Iodobenzamide (S(-)IBZM) is a substance with high affinity and high specificity for D2 receptors and was used in controls and in patients with different extrapyramidal disorders. After the i.v.(More)
Within the cerebellum several structures are considered to modulate the function of the vestibulo-ocular reflex (VOR). The nodulus and uvula have been implicated with the low-frequency components of the VOR, which are mediated by the velocity storage system. We report a patient with a selective lesion of the nodulus and ventral uvula. The findings suggest(More)