Behandlung des Morbus Parkinson: Neuropsychologische Veränderungen nach Tiefer Hirnstimulation
Abstract
Die Tiefenhirnstimulation (THS) ist beim Morbus Parkinson eine der effektivsten Therapieoptionen. Präoperativ wird nach einer dementiellen Entwicklung und nach Störungen in den Exekutivfunktionen gesucht, da letztere nach der Operation eine milde Verschlechterung erfahren können. Während neuropsychologische Veränderungen nach der VIM Stimulation nicht beobachtet werden, können leichte Defizite in der exekutiven Kontrolle nach der STN und der GPi Stimulation auftreten. Diese kognitiven Veränderungen haben keinen Einfluss auf die deutliche Besserung der Lebensqualität der Patienten durch die Operation. Durch das An- und Abschalten des Stimulators kann die Stimulation als ein reversibles, intraindividuelles Läsionsmodel angesehen werden, mit dem grundlegende Funktionen des STN untersucht werden können. Diese Auswirkungen der Stimulation finden zumeist kein Korrelat im täglichen Leben der Patienten.
Deep brain stimulation is one of the most effective therapies to treat Parkinson’s disease. The subthalamic nucleus (STN), the internal part of globus pallidum (GPi) and the nucleus ventrointermedius (VIM) of the thalamus are common stimulation sites. A comprehensive neuropsychological test-battery should be applied prior to surgery to exclude dementia and to specifically examine executive functioning, because executive functions can worsen after surgery. Whereas neuropsychological changes are not common after stimulation of the VIM and the GPi, STN stimulation may lead to mild worsening in executive functioning. These changes have been examined extensively for STN-DBS. A decline in verbal fluency (Cohens’ d – 0.5) and Stroop task performance (Cohens’ d -0.4) has been shown. However, these changes have no impact on the improvement of quality of life after surgery. Patients with an older age, suffering from axial motor symptoms and taking a higher levo-dopa equivalence dosage are at risk to decline in executive functions after surgery. If the electrode trajectories hit the caudate nucleus, patients showed a worsening in global cognition and working memory abilities. A worsening of verbal fluency and Stroop test performance are the consequence of the electrode placement itself, either due to a micro–lesional effect or an effect of electrode stimulation. As it can be switched off, DBS can may serve as a reversible, intra-individual lesion model of the STN. The modulation of the stimulation settings is a useful method to assess the impact of the STN on different cognitive domains such as spatial orientation, recognition of emotional stimuli and decision making to explore the role of the STN in the cognitive and the affective domain. Changes in these domains are only detectable using experimental designs and these changes have only minor consequences for patients’ daily routine.
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