PubMed Kapalı Erişimli Yayınlar
Permanent URI for this collectionhttps://hdl.handle.net/11727/10764
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Item A diffusion tensor imaging study in schizophrenia patients with clozapine induced obsessive compulsive symptoms(2023) Ay, Sule Bicakci; Oguz, Kader K.; Eroglu, Elcin Ozcelik; Has, Arzu Ceylan; Ertugrul, Aygun; 36382404Objective The aim of this study was to evaluate brain connectivity by diffusion tensor imaging (DTI) in schizophrenia patients with clozapine-induced obsessive compulsive symptoms (OCS). Methods Eighteen schizophrenia patients, nine of which had clozapine-induced OCS (Clz-OCS (+)), 9 without OCS (Clz-OCS (-)) and 9 healthy controls were included. Psychopathology was evaluated with Positive and Negative Syndrome Scale and Yale-Brown Obsession and Compulsion Scale in the patient groups. All groups were assesed with neurocognitive tests and DTI. Results Tract-Based Spatial Statistics based comparison of DTI revealed lower fractional anisotropy in the genu of corpus callosum (CC), right cingulum, left frontal white matter (WM) in the Clz-OCS (+) group, compared to controls. Fractional anisotropy was found to be lower in the bilateral occipital WM and higher in the bilateral medial temporal regions, anterior limb of internal capsule, cingulum, frontoparietal peripheral WM, right external capsule and genu of CC in Clz-OCS (+) patients compared to Clz-OCS (-). Conclusions WM integrity in several pathways such as cortico-striato-thalamo-cortical circuitry and orbito-frontal tracts seems to be affected differently in patients with Clz-OCS (+). Different neuroplastic effects of clozapine leading to occurrence of OCS in a subgroup of patients is possible, and needs further evaluation by longitudinal follow-up studies.Item The effects of catechol-O-methyltransferase single nucleotide polymorphisms on positive and negative symptoms of schizophrenia: A systematic review and meta-analysis(2022) Misir, Emre; Ozbek, Mutlu Muhammed; Halac, Eren; Turan, Serkan; Alkas, Gokce Elif; Ciray, Remzi Ogulcan; Ermis, Cagatay; 0000-0001-8953-1171; 35642295; AAF-3209-2021The catechol-O-methyltransferase (COMT) gene is thought to have an important role in the etiopathogenesis of schizophrenia, but there are conflicting results regarding its role in clinical presentation. We aimed to elucidate the relationship between the single nucleotide polymorphisms (SNPs) in the COMT gene and the severity of positive and negative symptoms. In order to investigate the relationship, the PubMed, PubMed Central, Scopus, and Cochrane CENTRAL databases were screened for eligible articles. Thirty-eight studies, including 4443 adult patients with schizophrenia, were included in the quantitative analyses, and four studies were qualitatively assessed. Quantitative analyses were performed for acutely ill and clinically stable patient subgroups regarding the different genotypes of rs4680 SNP. Our results showed that the severity of negative symptoms was higher in patients who were rs4680 Met homozygous compared to Val/Met heterozygotes only in acutely ill samples. There was no other significant difference between genotypes. Meta-regression did not reveal any significant moderator effect on the difference in negative symptoms. General psychopathology, positive, negative, and total psychotic symptom levels also were similar between Val homozygotes and Met carriers. Nonetheless, there are some limitations in the study. First, SNPs except for rs4680 were under-researched because of the limited number of studies. Second, high heterogeneity across studies was the main concern. Our results suggested that the COMT rs4680 Met allele was associated with higher levels of negative symptoms within acutely ill patients. Future studies should focus on specific patient subgroups to reveal the moderating effects of SNPs.Item Hiccups in an Adult Case with Schizophrenia due to Aripiprazole: A Case Report(2021) Kutuk, Meryem Ozlem; Berdzenishvili, Ekaterina; Aksu, Gulen Guler; 33795958Neurotransmitters and neuroreceptors involved in the pathophysiology of hiccups are not well defined. However, dopamine and serotonin are reported to have roles in activating hiccups, and recent case reports suggest that some psychopharmacologic medications -such as antipsychotics- may trigger hiccups in many cases. Our case describes the activation of hiccups in a young male with schizophrenia while being treated with aripiprazole. The patient was switched from risperidone to aripiprazole due to excessive sedation, hiccups started within 48 hours of initiation of treatment with aripiprazole at a dosage of 15 mg/day, and no change in the hiccups was observed despite a dose reduction. Discontinuation of aripiprazole treatment resulted in complete relief from hiccups. This case report shows that antipsychotics may trigger hiccups.