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Introduction
Movement Disorder Neurologist at Academic Medical Center, Amsterdam, the Netherlands. Specific fields of interest are deep brain stimulation (DBS), education and neuro-ophtalmology.
Additional affiliations
Education
August 2001 - March 2008
Publications
Publications (61)
Background:
Monoallelic, pathogenic STUB1 variants cause autosomal dominant cerebellar ataxia (ATX-STUB1/SCA48). Recently, a genetic interaction between STUB1 variants and intermediate or high-normal CAG/CAA repeats in TBP was suggested, indicating digenic inheritance or a disease-modifying role for TBP expansions.
Objective:
To determine the pr...
Deep Brain Stimulation can improve tremor, bradykinesia, rigidity, and axial symptoms in patients with Parkinson’s disease. Potentially, improving each symptom may require stimulation of different white matter tracts. Here, we study a large cohort of patients (N = 237 from five centers) to identify tracts associated with improvements in each of the...
Anti-IgLON5 disease is a rare, chronic neurological disease that may present with different ear, nose and throat (ENT) complaints. This report describes a patient that was diagnosed with anti-IgLON5 disease 14 years after his first presentation with
ENT complaints. He was treated with continuous positive airway pressure (CPAP) therapy with an apno...
Background
The effectiveness of Deep Brain Stimulation (DBS) therapy for Parkinson’s disease can be limited by side-effects caused by electrical current spillover into structures adjacent to the target area. The objective of the STEEred versus RING-mode DBS for Parkinson’s disease (STEERING) study is to investigate if directional DBS for Parkinson’...
Objectives:
Deep brain stimulation (DBS) of the subthalamic nucleus (STN) for Parkinson's disease (PD) has an ambiguous relation to speech. Speech impairment can be a stimulation-induced side effect, and parkinsonian dysarthria can improve with STN-DBS. Owing to the lack of an up-to-date and evidence-based approach, DBS reprogramming for speech im...
Orthostatic hypotension (OH) is an established and common cardiovascular risk factor for falls. An in-depth understanding of the various interacting pathophysiological pathways contributing to OH-related falls is essential to guide improvements in diagnostic and treatment opportunities. We applied systems thinking to multidisciplinary map out causa...
Observatie van de patiënt tijdens het consult levert al veel nuttige informatie op over het normaal neurologisch functioneren van het centrale en perifere zenuwstelsel. Het algemeen neurologisch onderzoek is veelomvattend, het betreft de hogere cerebrale functies (zoals bewustzijn, waarneming (gnosis) en ruimtelijk inzicht, geheugen, oordeelsvermog...
Introduction: Tremor is defined as an involuntary, rhythmic oscillatory movement of a body part and represents one of the most common symptoms in movement disorders, existing across several diseases. Particularly, in advanced states of tremor-related diseases such as Parkinson’s disease (PD) and Essential tremor syndrome (ET), response to pharmacot...
Background
The dentato-rubro-thalamic tract (DRT) is currently considered as a potential target in deep brain stimulation (DBS) for various types of tremor. However, tractography depiction can vary depending on the included brain regions. The fast gray matter acquisition T1 inversion recovery (FGATIR) sequence, with excellent delineation of gray an...
There is a growing interest in deep brain stimulation (DBS) of the nucleus basalis of Meynert (NBM) as a potential therapeutic modality for Parkinson’s disease dementia (PDD). Low-frequency stimulation has yielded encouraging results in individual patients; however, these are not yet sustained in larger studies. With the aim to expand the understan...
BACKGROUND
Dentato-rubro-thalamic tract (DRT) deep brain stimulation (DBS) suppresses tremor in essential tremor (ET) patients. However, DRT depiction through tractography can vary depending on the included brain regions. Moreover, it is unclear which section of the DRT is optimal for DBS.
OBJECTIVE
To evaluate deterministic DRT tractography and t...
Importance
It is unknown if there is a difference in outcome in asleep vs awake deep brain stimulation (DBS) of the subthalamic nucleus for advanced Parkinson disease.
Objective
To determine the difference in adverse effects concerning cognition, mood, and behavior between awake and asleep DBS favoring the asleep arm of the study.
Design, Setting...
The subthalamic nucleus and internal pallidum are main target sites for deep brain stimulation in Parkinson’s disease. Multiple trials that investigated subthalamic versus pallidal stimulation were unable to settle on a definitive optimal target between the two. One reason could be that the effect is mediated via a common functional network.
To tes...
Background:
Subarachnoid hemorrhage is a severe neurological condition which can cause a broad range of symptoms. Often, these symptoms are the direct consequence of the hemorrhage.
Case description:
A 58-year-old female was admitted to the emergency department with extreme headache and a sudden and brief loss of consciousness. She was diagnosed...
The subthalamic nucleus and internal pallidum are main target sites for deep brain stimulation in Parkinson's disease. Multiple trials that investigated subthalamic versus pallidal stimulation were unable to settle on a definitive optimal target between the two. One reason could be that the effect is mediated via a common network. To test this hypo...
Testing the pupillary response is a quick and valuable diagnostic measure for certain neurological and ophthalmological diseases in patients. The pupillary response can aid in localizing abnormalities in important parts of the visual system and brainstem, provided that the tests are executed and interpreted correctly. When an abnormal pupillary res...
Background:
7.0-T T2-weighted MRI offers excellent visibility of the subthalamic nucleus (STN), which is used as a target for deep brain stimulation (DBS) in Parkinson's disease (PD). A comparison of 7.0-T MRI to microelectrode recordings (MER) for STN border identification has not been performed.
Objective:
To compare representation of STN bord...
Motor improvement after deep brain stimulation (DBS) in the subthalamic nucleus (STN) may vary substantially between Parkinson’s disease (PD) patients. Research into the relation between improvement and active contact location requires a correction for anatomical variation. We studied the relation between active contact location relative to the neu...
Background
Individual motor improvement after deep brain stimulation (DBS) of the subthalamic nucleus (STN) for Parkinson’s disease (PD) varies considerably. Stereotactic targeting of the dorsolateral sensorimotor part of the STN is considered paramount for maximising effectiveness, but studies employing the midcommissural point (MCP) as anatomical...
BACKGROUND
Ventral intermediate nucleus (VIM) deep brain stimulation (DBS) and posterior subthalamic area (PSA) DBS suppress tremor in essential tremor (ET) patients, but it is not clear which target is optimal. Aligning both targets in 1 surgical trajectory would facilitate exploring stimulation of either target in a single patient.
OBJECTIVE
To...
Background:
Deep brain stimulation (DBS) of the globus pallidus pars interna (GPi) and the subthalamic nucleus (STN) are established treatment option in Parkinson's disease (PD). If DBS does not provide the desired effect, re-operation to the alternative target is a treatment option, but data on the effect of re-operation are scarce.
Objectives:...
OBJECTIVE
Deep brain stimulation (DBS) is effective in the management of patients with advanced Parkinson’s disease (PD). While both the globus pallidus pars interna (GPi) and the subthalamic nucleus (STN) are accepted targets, their relative efficacy in randomized controlled trials (RCTs) has not been established beyond 12 months. The objective of...
Aims:
To investigate whether deep brain stimulation (DBS) of the globus pallidus pars interna (GPi) or the subthalamic nucleus (STN) improve lower urinary tract symptoms (LUTS) in advanced Parkinson's disease (PD).
Methods:
An exploratory post-hoc analysis was performed of specific LUTS items of questionnaires used in a randomized clinical trial...
Diepe hersenstimulatie (‘deep brain stimulation’, DBS) voor de ziekte van Parkinson kan worden overwogen bij patiënten met responsfluctuaties, als aanpassingen in het medicatieschema onvoldoende helpen. DBS verbetert vooral de motorische symptomen, zoals tremor, bradykinesie en rigiditeit. Daarnaast is de tijd die patiënten in de off-fase doorbreng...
Background:
Effects on non-motor symptoms, mainly cognitive and psychiatric side effects, could influence the decision for either globus pallidus pars interna (GPi) or subthalamic nucleus (STN) deep brain stimulation (DBS) for patients with Parkinson's disease (PD).
Objective:
1) To compare cognitive and psychiatric outcomes 3 years after GPi DB...
In 2 unrelated patients with axial hypotonia, developmental delay and a hyperkinetic movement disorder, a missense mutation was found in codon 209 of the GNAO1 gene. From the still scarce literature on GNAO1 mutations, a clear genotype-phenotype correlation emerged. From the 26 patients reported thus far, 12 patients had epileptic encephalopathy, a...
OBJECTIVE: To compare motor symptoms, cognition, mood, and behavior 3 years after deep brain stimulation (DBS) of the globus pallidus pars interna (GPi) and subthalamic nucleus (STN) in advanced Parkinson disease (PD). METHODS: Patients with PD eligible for DBS were randomized to bilateral GPi DBS and bilateral STN DBS (1:1). The primary outcome me...
A 30-year-old man presented with 3 months of alternating hyper- and hypothermia, libido loss, hypersomnia, and headache. Neurologic examination was unremarkable. Laboratory tests revealed low serum testosterone and hypocortisolism. MRI showed hypothalamic T2 hyperintensity and contrast enhancement (figure, A). CSF analysis showed moderate lymphocyt...
Objective:
To compare motor symptoms, cognition, mood, and behavior 3 years after deep brain stimulation (DBS) of the globus pallidus pars interna (GPi) and subthalamic nucleus (STN) in advanced Parkinson disease (PD).
Methods:
Patients with PD eligible for DBS were randomized to bilateral GPi DBS and bilateral STN DBS (1:1). The primary outcome...
Background:
The aim of this study was to assess psychiatric and social outcome 12 months after bilateral deep brain stimulation (DBS) of the globus pallidus pars interna (GPi) and subthalamic nucleus (STN) for advanced Parkinson's disease (PD).
Methods:
We randomly assigned patients to receive GPi DBS (n = 65) or STN DBS (n = 63). Standardized p...
To assess the neuropsychological outcome 12 months after bilateral deep brain stimulation (DBS) of the globus pallidus pars interna (GPi) or subthalamic nucleus (STN) for advanced Parkinson disease.
We randomly assigned patients to receive either GPi DBS or STN DBS. Standardized neuropsychological tests were performed at baseline and after 12 month...
Deep brain stimulation (DBS) for Parkinson’s disease is a treatment option in patients with medicationinduced
motor response fluctuations, when medication schedule adjustments are no longer able to sustain
optimal functioning in daily life. DBS mainly improves motor symptoms that initially responded well to
dopaminergic treatment, such as tremor, b...
Background:
Patients with advanced Parkinson's disease often have rapid swings between mobility and immobility, and many respond unsatisfactorily to adjustments in pharmacological treatment. We assessed whether globus pallidus pars interna (GPi) deep brain stimulation (DBS) gives greater functional improvement than does subthalamic nucleus (STN) D...
Parkinson's disease (PD) is a neurodegenerative disorder characterised by tremor, rigidity and bradykinesia. The current treatment, for example with levodopa or dopamine-agonists, is complicated by response fluctuations, dyskinesias and gastro-intestinal side-effects. These, and various other reasons including fear of levodopa toxicity, have led to...