István Valálik

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PURPOSE The purpose of the retrospective case series of eight consecutive patients is to call our attention to the optimal timing of decompressive craniectomy (DC) in children. METHOD We report the outcomes of eight children under the age of 12 with severe head injuries. DC was performed at different intracranial pressure (ICP; 20 and 25 mmHg) levels. (More)
BACKGROUND Stereotactic targets for thalamotomy are usually derived from population-based coordinates. Individual anatomy is used only to scale the coordinates based on the location of some internal guide points. While on conventional MR imaging the thalamic nuclei are indistinguishable, recently it has become possible to identify individual thalamic nuclei(More)
BACKGROUND AND PURPOSE The antiakinetic effect of internal Globus pallidus deep brain stimulation (Gpi-DBS) in Parkinson's disease is not clear and not either how this effect is modulated by L-dopa. METHODS Left Gpi-DBS and/or L-dopa effect was studied with auditory paced right-handed sequential movements on (15)O-butanol positron emission tomography (PET)(More)
BACKGROUND The visualization of any morphological volume (i.e. CT, MRI) together with an additional second morphological volume (i.e. CT, MRI) or functional data set, which may come from SPECT or PET, is a new method for treatment planning, verification and follow-up of interstitial irradiation. METHOD The authors present their experience on interstitial(More)
OBJECTIVE To evaluate the effect of unilateral thalamotomy in patients with Parkinson's disease. METHODS The junction of the ventralis oralis posterior and ventralis intermedius nuclei targeted under CT-guidance, and confirmed by impedance recording and macrostimulation. RESULTS At the 6-month assessment the tremor has been completely abolished in 37(More)
PURPOSE To report on iodine-125 ((125)I) interstitial irradiation in the treatment of brain stem tumors. PATIENTS AND METHODS Two patients with brain stem tumors were treated with CT- and image fusion-guided (125)I stereotactic brachytherapy. RESULTS By March 2003, the patients had been followed up for 47 and 13 months, respectively. In case 1, the(More)
OBJECTIVES The purpose of this study was to investigate the effects of bilateral subthalamic nucleus deep brain stimulation on the phonation of patients with Parkinson's disease in three drug-free conditions: (1) stimulation off, (2) with clinically optimised stimulation parameters, and (3) subthreshold overstimulation, in order to detect differences(More)
In the past 30 years it has been a great development in the unders-anding and therapy of obsessive-compulsive disorder. Adequate pharmaco- and cognitive-behavior therapies reduce the symptoms in 40-60% of patients, so a remarkable portion of patients still remains refractory to conventional treatment. Neurosurgery--with it's reversible and irreversible(More)
OBJECTIVES To assess positioning accuracy in otosurgery and to test the impact of the two-handed instrument holding technique and the instrument support technique on surgical precision. To test an otologic training model with optical tracking. STUDY DESIGN In total, 14 ENT surgeons in the same department with different levels of surgical experience(More)