Publications by authors named "Serhat Ozkan"

: Subthalamic nucleus deep brain stimulation (STN-DBS) is a standard treatment for motor complications in Parkinson's disease (PD). Its impact on axial symptoms is still not fully understood. This study aimed to quantitatively evaluate the effect of frequency changes within the therapeutic window on postural control performances of individuals with PD who underwent bilateral STN-DBS.

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Objectives: Cognitive impairment is a prevalent non-motor symptom of Parkinson's disease (PD), significantly impacting patient quality of life. The Clock Drawing Test (CDT) evaluates cognitive abilities, including planning, organization, and executive functions such as attention, memory, and visuospatial skills. This study aimed to determine the sensitivity of the CDT in diagnosing cognitive impairment in PD.

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In the elderly population, Parkinson's Disease (PD) is the second most common neurodegenerative disorder and is associated with morphological changes in the basal ganglia, especially the substantia nigra (SN). This study aimed to evaluate the volume and signal intensity (SI) of SN using Magnetic Resonance Imaging (MRI) to detect structural changes and investigate the relationship between the onset side and disease severity of PD. Clinical features and imaging data of 58 patients with PD were retrospectively analyzed from their medical records.

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Background: Gordon Holmes syndrome (GHS) is a rare autosomal recessive disorder characterized by hypogonadotropic hypogonadism, cognitive decline, and cerebellar ataxia. Mutations in the Ring Finger Protein 216 (RNF216) gene have been known to be associated with GHS therewithal RNF216 mutations have been detected in cases with Huntington-like disease, 4H syndrome (hypodontia, hypomyelination, ataxia and hypogonadotropic hypogonadism), and congenital hypogonadotropic hypogonadism.

Case Presentation: Here we report a novel homozygous frameshift mutation in RNF216 gene c.

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Article Synopsis
  • Patients with Parkinson's disease (PwP) struggle with recognizing faces, especially when they are masked due to the COVID-19 pandemic, compared to younger healthy individuals.
  • A study involving 64 PwP, 58 older healthy controls, and 61 younger healthy controls used a face recognition test and a questionnaire to assess recognition difficulties among the groups.
  • Results showed PwP performed similarly to older controls in recognizing faces but had more difficulties than younger controls, indicating a specific challenge for older adults that could affect their social interactions during the pandemic.
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Introduction: The aim of this study was to form the Turkish adaptation of the SCOPA-SleepScale to be used in evaluating sleep quality in individuals with Parkinson's disease and to test its psychometric properties.

Method: Data for this methodological study was collected between May and December 2017 in the neurology outpatient clinic of a hospital through face to face interviews with patients with a diagnosis of Parkinson's disease. The sample of the study consisted of 105 patients of 18 years of age and above with no additional neurological diseases who volunteered for the study.

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Cerebrotendinous xanthomatosis (CTX) is a lipid storage disease caused by deficiency of sterol 27-hydroxylase enzyme encoded by CYP27A1 gene. This multicenter, cross-sectional descriptive study aimed to document clinical characteristics of CTX patients of different ages, clinical presentations of early-diagnosed patients, and responses to short-term chenodeoxycholic acid (CDCA) treatment. Seven of 11 CTX patients were diagnosed in childhood.

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Introduction: This study compared the Turkish version of Test Your Memory (TYM) MMSE (Mini-Mental State Examination) and CDT (Clock Drawing Test) in patients with neurocognitive disorder.

Methods: After a thorough medical workup, patients with a diagnosis of neurocognitive disorder were enrolled. A cross-sectional design was used to compare the TYM results with those of MMSE and CDT.

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Objectives: Metoclopramide is a commonly used medication in pediatric practice, and dystonia is a common adverse effect of it. The present study aims to evaluate the clinical characteristics of metoclopramide-induced acute dystonic reactions (MIADRs) in pediatric patients admitted to the pediatric emergency unit.

Methods: Twenty-eight patients were admitted with MIADRs between June 2004 and April 2016; they were enrolled into the study retrospectively.

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Background: Pathological yawning is a compulsive, frequent, repetitive yawning triggered by a specific reason besides fatigue or boredom. It may be related to iatrogenic, neurologic, psychiatric, gastrointestinal, or metabolic disorders. Moreover, it could also be seen in the course of an ischemic stroke.

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Background: Movement Disorders Society Unified Parkinson's Disease Rating Scale (MDS-UPDRS) and Unified Dyskinesia Rating Scale (UDysRS) were developed as standard tools to rate Parkinson's disease (PD) and drug-induced dyskinesias of PD. As these scales have become widely used, there is a need for translation to non-English languages. Here we present the standardization for the Turkish translations.

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Objective This study was performed to assess the efficacy of memantine in patients with amnestic mild cognitive impairment (aMCI). Methods Thirty healthy controls and 45 patients diagnosed with aMCI based on the Petersen criteria were classified into 3 groups. Group 1 comprised patients who received a single memantine dose following examination (n = 25), Group 2 comprised patients who did not receive memantine treatment following examination (n = 20), and Group 3 comprised healthy age-matched volunteers (n = 30).

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Parkinson's disease (PD) is a late-onset neurodegenerative disorder with both familial and sporadic presentation. The main pathological characteristic of PD is the death of dopaminergic neurons in the substantia nigra (SN) pars compacta. PD is the second most common neurodegenerative disease worldwide, after Alzheimer's disease.

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Background: Alzheimer's disease (AD) is one of the most common degenerative neurological disorders among elderly people, and is associated with progressive cerebral atrophy. AD is characterized by deterioration of the memory, difficulties with language, alterations in behavior and dysfunction in daily activities.

Objectives: The purpose of the present study was to measure the total volumes of different parts of the brain of AD patients and healthy gender-matched controls using Cavalieri's volume estimate method, and to establish some brain ratios.

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Although ideomotor limb apraxia is considered to be a typical sign of cortical pathologies such as Alzheimer's disease (AD), it has been also reported in subcortical neurodegenerative diseases and vascular lesions. We aimed to investigate the difference between AD, subcortical vascular dementia (SVaD) and mild cognitive impairment (MCI) patients by means of ideomotor limb apraxia frequency and severity. Ninety-six AD, 72 SVaD, and 84 MCI patients were assessed with the mini-mental status examination (MMSe), clinical dementia rating (CDR) and the apraxia screening test of TULIA (AST).

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Palatal tremor is a rare movement disorder characterized by rhythmic movement of the soft palate. There are two subtypes: essential and symptomatic palatal tremor. Essential palatal tremor is characterized by tinnitus and an absence of other neurological deficits.

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Marcus Gunn jaw winking synkinesis (MGJWS) is caused by congenital miswiring of a branch of the fifth cranial nerve into the branch of the third cranial nerve supplying the levator muscle. It has been observed in 2-13% of patients with congenital ptosis. Although bilateral cases were reported, most were unilateral and occurred more frequently on the left side than the right.

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Amyloid β42 (Aβ42) and proinflammatory cytokines such as interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α) have been suggested to contribute to the pathogenesis of Alzheimer's disease (AD) and vascular dementia (VaD). Our aim was to examine whether the changes in these parameters would be able to discriminate the patients with AD from those with VaD and from healthy individuals. We have analyzed the levels of Aβ42, IL-6 and TNF-α in the serum of newly diagnosed 28 AD patients, 16 VaD patients and 26 healthy non-demented controls.

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Background: Patients with pseudo-dementia are at particular risk of being labeled as Alzheimer dementia. We thus need better diagnostic methods. In this study, we evaluated the cerebral reactivity of the posterior cerebral arteries (PCAs) during visual stimulation by transcranial Doppler ultrasonography.

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The objective of this study is to investigate the efficacy of low-level laser therapy (LLLT) in patients with carpal tunnel syndrome (CTS). Sixty patients with CTS were included in this placebo-controlled and double-blind study and randomly assigned to three treatment groups: active laser with a dosage of 1.2 J/per painful point, active laser with a dosage of 0.

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Objective: To determine the value of gray-scale and power Doppler ultrasonography in the evaluation of carpal tunnel syndrome (CTS).

Materials And Methods: Median nerves at the carpal tunnel were evaluated by using gray-scale and power Doppler ultrasonography and by using accepted and new criteria in 42 patients with CTS (62 wrists) confirmed by electromyogram and 33 control subjects. We evaluated the cross-sectional area of the nerve just proximal to the tunnel inlet (CSAa), and at mid level (CSAb).

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This study aimed to investigate the prevalence of various cognitive disorders in the older population (age 55 years and above) of Eskisehir, Turkey, by conducting a cluster sampled door-to-door survey. A total of 3100 inhabitants were screened with the Mini-Mental State Examination (MMSE) and a questionnaire concerning demographic, occupational and social data. Individuals (n=320) with MMSE scores of 25 were assessed according to the 10th Revision of the International Statistical Classification of Diseases and Related Health Problems (ICD-10) and were investigated in the more detailed phase 2 study.

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We assessed the effect of intravenous high-dose methylprednisolone (IVMP) on cerebral reactivity in multiple sclerosis (MS) patients during exacerbations by means of functional transcranial Doppler imaging. Forty-eight clinically defined MS patients were evaluated with visual evoked potentials (VEP) and functional transcranial Doppler sonography (TCD) of both posterior cerebral arteries before and after 5 days of 1000 mg IVMP. After treatment, mean Expanded Disability Status Scale score, mean blood flow velocities and mean blood flow velocities at rest and at stimulation, significantly decreased (p < 0.

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