Publications by authors named "George Vartzelis"

: Myelin oligodendrocyte glycoprotein (MOG) is exclusively expressed in the central nervous system (CNS) and is found on the outer surface of oligodendrocytes. Antibodies to MOG are associated with CNS demyelination, whereas peripheral nervous system (PNS) demyelination is seldom reported to be related to MOG-IgG. : The database of patients seen in our neurological academic center was searched for MOG-IgG seropositivity and concomitant demyelinating polyneuropathy.

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Inflammatory bowel disease (IBD) is a lifelong, immune-mediated disorder that often occurs in childhood and is becoming increasingly common worldwide. Diagnosis of IBD in children remains difficult due to the spectrum of symptoms, including gastrointestinal and extraintestinal manifestations. Type 1 diabetes mellitus (T1D) is one of the most common autoimmune diseases in children and adolescents.

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Unlabelled: The purpose of this study was to investigate knowledge, principles, and practices concerning the management of children with febrile seizures among pediatricians in Greece. A cross-sectional study was performed across Greece. Pediatricians completed an anonymous and voluntary 11-item questionnaire about their knowledge, attitudes, and practices with respect to the management of febrile seizures; the survey also collected demographic data.

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Background: Promising genetic treatments targeting the molecular defect of severe early-onset genetic conditions are expected to dramatically improve patients' quality of life and disease epidemiology. Spinal Muscular Atrophy (SMA), is one of these conditions and approved therapeutic approaches have recently become available to patients.

Objective: Analysis of genetic and clinical data from SMA patients referred to the single public-sector provider of genetic services for the disease throughout Greece followed by a retrospective assessment in the context of epidemiology and genotype-phenotype associations.

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Background: Pediatric-onset multiple sclerosis (POMS) is considered a complex disease entity with many genetic and environmental factors implicated in its pathogenesis. Linkage studies in Caucasian adult populations consistently demonstrate the major histocompatibility complex and its (human leukocyte antigen) polymorphisms as the genetic locus most strongly linked to MS.

Objective: To investigate the frequencies and possible clinical and imaging correlations of alleles in a Hellenic POMS sample.

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A 5.5-month-old female infant with tuberous sclerosis complex presented with infantile spasms and was treated with vigabatrin. As her condition did not improve, she was given adrenocorticotropic hormone (ACTH) intramuscularly which stopped the spasms and improved the electroencephalogram (EEG) abnormalities.

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Multiple sclerosis is a chronic, debilitating disease. Almost one in ten patients with MS has a history of disease onset during childhood. Although numerous therapeutic options exist for adult MS, the available treatments for pediatric patients are still limited.

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The aim of this study was to compare the immunogenicity and side-effects of hepatitis A virus (HAV) vaccination between periodic fever, aphthous stomatitis, pharyngitis, and adenitis (PFAPA) patients and healthy controls who have not been previously exposed to HAV. A prospective observational study was carried out of 28 PFAPA patients and 76 controls who received two doses of the vaccine. Immunogenicity was expressed as seroconversion and seroprotection rates; mean HAV-immunoglobulin G concentration was measured at 0, 1, 7 and 18 months.

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Objectives: To describe the immunogenicity and side effects of immunisation against hepatitis A virus (HAV) in JIA patients on methotrexate treatment, who have not been previously exposed to HAV.

Methods: Case-control study performed in JIA patients and healthy controls matched on age and gender. The subjects received two doses of inactivated anti-HAV vaccine (720 mIU/ml) intramuscularly at 0 and 6 months.

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Background: Studies of the effect of oxcarbazepine (OXC) on body growth of children with epilepsy are rare and their results are controversial. To the contrary, many studies have shown significant weight gain following valproate (VPA) treatment.

Purpose: To prospectively evaluate the effect of OXC monotherapy on growth patterns of children with epilepsy and compare it with the effect of VPA monotherapy.

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Background: Pelizaeus-Merzbacher disease (PMD) is an X-linked dysmyelinating disorder characterized by nystagmus, hypotonia, ataxia, progressive spasticity, and cognitive decline. PMD classically results from a duplication of a genomic segment encompassing the entire PLP1 gene. Since the PLP1 gene is located in Xq22, PMD affects mostly boys.

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Unlabelled: We report on a 5-year-old boy with recurrent severe postinfectious rhabdomyolysis who, after systematic stepwise evaluation, was found to have the adult form of carnitine palmityl transferase II (CPT II) deficiency directly by blood mutation analysis. Timely diagnosis of CPT II deficiency in this case prevented further potentially devastating episodes of rhabdomyolysis by avoiding triggering factors.

Conclusion: Although most cases of rhabdomyolysis are nonrecurrent and benign, a metabolic myopathy, such as CPT II deficiency, should be suspected in children with episodic muscle necrosis and paroxysmal myoglobinuria.

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Objectives: Hepatitis B is a vaccine preventable disease with intermediate endemicity in Greece. Patients with juvenile idiopathic arthritis (JIA) on immunomodulating therapy are prone to infection or reactivation of hepatitis B virus (HBV). The aim of this study is to define the immune status against HBV in children newly-diagnosed with JIA.

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