92 results on '"Tasdelen B"'
Search Results
2. An experimental investigation on contact length during minimum quantity lubrication (MQL) machining
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Tasdelen, B., Thordenberg, H., and Olofsson, D.
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- 2008
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3. Studies on minimum quantity lubrication (MQL) and air cooling at drilling
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Tasdelen, B., Wikblom, T., and Ekered, S.
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- 2008
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4. Anticancer drug release from poly(N-isopropylacrylamide/itaconic acid) copolymeric hydrogels
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Taşdelen, B., Kayaman-Apohan, N., Güven, O., and Baysal, B.M.
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- 2005
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5. pH-thermoreversible hydrogels. I. Synthesis and characterization of poly( N-isopropylacrylamide/maleic acid) copolymeric hydrogels
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Taşdelen, B., Kayaman-Apohan, N., Güven, O., and Baysal, B.M.
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- 2004
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6. 900 MHz radiofrequency radiation has potential to increase the expression of rno-miR-145-5p in brain
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Suleyman Dasdag, Erdal, M. E., Erdal, N., Tasdelen, B., Kiziltug, M. T., Yegin, K., and Akdag, M. Z.
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Brain ,Diseases ,MiR-145-5p ,Mobile phones ,MiRNA ,900 MHz RF radiation - Abstract
2-s2.0-85081204776, Interaction between radiofrequency radiation (RFR) and miRNA which plays paramount role in growth, differentiation, proliferation, and cell death by suppressing one or more target genes, is still unknown. Therefore, the purpose of this study is to investigate the effects of long term 900 MHz mobile phone exposure on some of the miRNA in brain tissues (sham: 7; Exposure: 7)., which were kept in appropriate laboratory conditions for the second phase of our previous study [5]. It is remembered that rats in the exposure group were exposed to 900 MHz RFR for 3 h per day (7 days a week) for one year. For the aim of this study, expression of miRNAs such as rno-miR-22-3p, rno-miR-24-1-3p, rno-miR-132-3p, rno-miR-145-5p, rno-miR-181a-5p, rno-miR-186-5p, rno-miR-195-5p, rno-miR-219a-5p, rno-miR-221-3p and rno-miR-222-3p were investigated. Results indicated that long-term exposure of 900 MHz RF radiation increased only expression of rno-miR-145-5p (adj P * = 0.047) value where 1g average SAR value in brain was 0.198 W/kg. Our results indicated that chronic exposure of 900 MHz RFR has potential to increase expression of rno-miR-145-5p. Therefore, further studies are necessary to understand the relation between 900 MHz mobile phone exposure and diseases related to the expression of rno-miR-145-5p. © University of Dicle.
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- 2019
7. RLS is an important and frequent cause of depression and anxiety in patients with MS: striking results of the 'RELOMS-T'
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Sevim, S., Demirkiran, M., Terzi, M., Yuceyar, A. N., Tasdelen, B., Idiman, E., Kurtuncu, M., Boz, C., Tuncel, D., Karabudak, R., Siva, A., Ozcan, C., Neyal, M., Goksel, B. Karakurum, Balal, M., Sen, S., Ekmekci, O., Oksuz, N., and Kaya, D.
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- 2018
8. Therapeutic hypothermia and myocardium in perinatal asphyxia: a microvolt T-wave alternans and Doppler echocardiography study
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Karpuz, D., primary, Celik, Y., additional, Giray, D., additional, Tasdelen, B., additional, and Hallioglu, O., additional
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- 2018
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9. Clinical and histopathological relationship of sildenafil and bosentan treatments in rats with monocrotaline induced pulmonary hypertension
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Karpuz, D., primary, Hallioglu, O., additional, Buyukakilli, B., additional, Gurgul, S., additional, Balli, E., additional, Ozeren, M., additional, and Tasdelen, B., additional
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- 2017
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10. Sleep Disorders of Childhood and Adolescents Migraine and Episodic TTH
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Yildirim, V., Oksuz, N., Ayta, S., Guler, G., Toros, F., Tasdelen, B., Ozge, A., and Maltepe Üniversitesi
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health care facilities, manpower, and services ,education ,social sciences ,health care economics and organizations - Abstract
International Headache Congress of the International-Headache-Society and American-Headache-Society -- JUN 27-30, 2013 -- Boston, MA, WOS: 000329543900288, …, Int Headache Soc, Amer Headache Soc
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- 2013
11. MON-PP037: The Effects of Beta-Hydroxy Beta-Methylbutyrate (HMB) on the Healing of Colonic Anastomosis in an Experimental Sepsis Model Induced by Lipopolysaccharides in Rats
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Yildirim, A.G., primary, Dag, A., additional, Ocal, K.A., additional, Gumus, L.T., additional, Comelekoglu, U., additional, Pfeifer, E.S., additional, Tasdelen, B., additional, and Gorur, A., additional
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- 2015
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12. Genistein attenuates post-ischemic ovarian injury in rat adnexal torsion-detorsion model
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Dilek, S., Tasdelen, B., Yazici, G., Cinel, I., Cimen, B., Arslan, M., and ERDEM, OSMAN AYHAN
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- 2006
13. Anticancer Drug Release From Poly(N-Isopropylacrylamide/Itaconic Acid) Copolymeric Hydrogels
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Tasdelen, B, Kayaman-Apohan, N, Guven, O, and Baysal, BM
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technology, industry, and agriculture ,macromolecular substances - Abstract
The drug uptake and release of anticancer drug from N-isopropylacrylamide/itaconic acid copolymeric hydrogels containing 0-3 mol% of itaconic acid irradiated at 48 kGy have been investigated. 5-Fluorouracil (5-FU) is used as a model anticancer drug. The effect of 5-FU solution on swelling characteristics of PNIPAArn and P(NIPAAm/IA) copolymeric hydrogels have also been studied. The percent swelling, equilibrium swelling, equilibrium water/5-FU content and diffusion constant values are evaluated for poly(N-isopropylacrylamide) (PNIPAAm) and poly(N-isopropylacrylamide/itaconic) (P(NIPAAm/IA)) hydrogels at 130 ppm of 5-FU solution at room temperature. Diffusion of 5-FU solution into the hydrogels has been found to be the non-Fickian type. Finally, the kinetics of drug release from the hydrogels are examined. (c) 2004 Elsevier Ltd. All rights reserved.
- Published
- 2005
14. Preparation, Characterization, And. Drug-Release Properties Of Poly(N-Isopropylacrylamide) Microspheres Having Poly(Itaconic Acid) Graft Chains
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Tasdelen, B, Kayaman-Apohan, N, Misirli, Z, Guven, O, and Baysal, BM
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An inverse suspension polymerization method for the preparation of thermoresponsive hydrogel microspheres based on N-isopropylacrylamide was described in this article. The polymerization reaction was carried out at 200 rpm stirring rate and the microspheres obtained were in the size range of 71-500 mu m in the swollen states. The particles were sieved by using ASTM sieves. The selected fraction (180-250 mu m) of poly(N-isopropylacrylamide) (PNIPAAm) microspheres was used for radiation-induced modification with itaconic acid (TA) to obtain PNIPAAm/poly(itaconic acid) graft copolymer. Viagra and lidocaine were used as model drugs for the investigation of controlled-release behavior of the microspheres. Incorporation of IA graft chains onto microspheres enhanced significantly the uptake of both drugs and further controlled release at specific pH values. The release studies showed that some of the basic parameters affecting the drug-loading and -release behavior of the microspheres were pH, temperature, particle size, and chemical nature of drug. (c) 2005 Wiley Periodicals, Inc.
- Published
- 2005
15. Preparation Of Poly (N-Isopropylacrylamide/Itaconic Acid) Copolymeric Hydrogels And Their Drug Release Behavior
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Tasdelen, B, Kayaman-Apohan, N, Guven, O, and Baysal, BM
- Abstract
N-isopropylacrylamide/itaconic acid copolymeric hydrogels were prepared by irradiation of the ternary mixtures of N-isopropylacrylamide/itaconic acid/water by gamma-rays at ambient temperature. The effect of comonomer concentration, irradiation dose and pH on the swelling equilibria were studied. Lidocaine was used as a model drug for the investigation of drug release behaviour of hydrogels. Lidocaine adsorption capacity of the hydrogels were found to increase from 3.6 to 862.1 (mg lidocame/g dry gel) with increasing amount of itaconic acid in the gel structure. Adsorption and release processes were followed at 4 and 37 degreesC, respectively. The release studies showed that the basic parameters affecting the drug release behaviour of the hydrogels were pH and temperature of the solution and cross-link density of the gels. (C) 2004 Elsevier B.V. All rights reserved.
- Published
- 2004
16. Ph-Thermoreversible Hydrogels. I. Synthesis And Characterization Of Poly(N-Isopropylacrylamide/Maleic Acid) Copolymeric Hydrogels
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Tasdelen, B, Kayaman-Apohan, N, Guven, O, and Baysal, BM
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technology, industry, and agriculture ,macromolecular substances - Abstract
N-isopropylacrylamide (NIPAAM)/maleic acid (MA) copolymeric hydrogels were prepared by irradiating the ternary mixtures of NIPAAM/MA/Water by gamma-rays at ambient temperature. The influence of external stimuli such as pH and temperature of the swelling media on the equilibrium swelling properties was investigated. The hydrogels showed both temperature and pH responses. The effect of comonomer concentration and irradiation dose on the swelling equilibria and phase transition was studied. For the characterization of these hydrogels, the diffusion behaviour and molecular weight between crosslinks were investigated. (C) 2003 Elsevier Ltd. All rights reserved.
- Published
- 2004
17. Swelling And Diffusion Studies Of Poly(N-Isopropylacrylamide/Itaconic Acid) Copolymeric Hydrogels In Water And Aqueous Solutions Of Drugs
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Tasdelen, B, Kayaman-Apohan, N, Guven, O, and Baysal, BM
- Abstract
N-Isopropylacrylamide/itaconic acid hydrogels (NIPAAm/IA) containing different amounts of itaconic acid prepared by irradiating with gamma-radiation were used in experiments on swelling and diffusion of the model drugs methylene blue, lidocaine, and sildenafil citrate (VIAGRA). The NIPAAm/IA hydrogels containing 0-3 mol % itaconic acid irradiated at 48 kGy has been used for swelling and diffusion studies in water and aqueous solutions containing the above-mentioned model drugs. For these hydrogels, swelling studies indicated that swelling increased with the following order: water > lidocaine > methylene blue > VIAGRA. Diffusions of water and the drugs within hydrogels were found to be non-Fickian in character. (C) 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 911-915, 2004.
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- 2004
18. Investigation Of Drug Release From Thermo- And Ph-Sensitive Poly(N-Isopropylacrylamide/Itaconic Acid) Copolymeric Hydrogels
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Tasdelen, B, Kayaman-Apohan, N, Guven, O, and Baysal, BM
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technology, industry, and agriculture ,macromolecular substances ,complex mixtures - Abstract
N-Isopropylacrylamide/itaconic acid copolymeric hydrogels were prepared by irradiation of the ternary mixtures of N-isopropylacrylamide/itaconic acid/water by gamma-rays at ambient temperature. The dependence of swelling properties and phase transitions on the comonomer concentration and temperature were investigated. The hydrogels showed both temperature and pH responses. The effect of comonomer concentration on the uptake and release behavior of the hydrogels was studied. Methylene blue (MB) was used as a model drug for the investigation of drug uptake and release behavior of the hydrogels. The release studies showed that the basic parameters affecting the drug release behavior of the hydrogels were pH and temperature of the solution. Copyright (C) 2004 John Wiley Sons, Ltd.
- Published
- 2004
19. Detection of Memory Impairment in a Community-Based System: A Collaborative Study
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Kiral, K., primary, Ozge, A., additional, Sungur, M. A., additional, and Tasdelen, B., additional
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- 2013
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20. An Integrated Index Combined by Dynamic Hyperinflation and Exercise Capacity in the Prediction of Morbidity and Mortality in COPD
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Ozgur, E. S., primary, Nayci, S. A., additional, Ozge, C., additional, and Tasdelen, B., additional
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- 2012
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21. An Experimental Study to Understand the Effect of Cooling Media in Metal Cutting.
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Tasdelen, B., Nayyar, V., Kaminski, J., Klement, U., Nyborg, L., and Sotkovszki, P.
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METAL cutting ,METAL-cutting tools ,ENVIRONMENTAL law ,EMULSIONS ,WORKPIECES - Abstract
Dry and Semi-Dry machining has gained interest in the last years because of the new environmental legislations and the possibility to decrease the machining cost. However, the role of cutting media such as emulsion, compressed air and Minimum Quantity Lubrication (MQL) on the chip formation has not been understood yet. The mechanical and thermo dynamical conditions in the cutting zone affects the properties of work piece material under cutting and these conditions change with the application of cutting media. In this work medium alloyed forged steel was machined with assistance of emulsion, MQL and only compressed air and the results were compared to dry machining in terms of chip color, micro structure, white-etching band and contact area between chip and the insert rake face. It was observed that white-etching band, which is believed to be ferrite, forms both on the chip upper free side and chip back side for all conditions. In emulsion cutting, this band has finest grains and with dry cutting it has largest grains proving a slower cooling with dry cutting. Not a big difference was observed on white-etching band when MQL, compressed air and dry machining were compared. However, it was observed that thermo-mechanical effect of air in MQL and compressed air supply has affected the contact area when the media was applied on rake face. [ABSTRACT FROM AUTHOR]
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- 2011
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22. Incidence of pressure ulcers in intensive care unit patients at risk according to the Waterlow scale and factors influencing the development of pressure ulcers.
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Sayar S, Turgut S, Dogan H, Ekici A, Yurtsever S, Demirkan F, Doruk N, and Tasdelen B
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BEDSORE risk factors ,MEDICAL care ,MORTALITY ,INTENSIVE care units ,NURSING services - Abstract
Aims. To determine incidence of pressure ulcers in patients at risk according to the Waterlow scale in intensive care units and to evaluate the effects of risk factors in critically ill patients. Background. Pressure ulcers continue to be an important health problem that increases the risk of illness and death, extends patients' length of hospital stay and increases healthcare expenses. Design. The study was conducted as a descriptive and prospective study. Method. The sample consisted of 140 patients. Data were collected using a data collection form, the skin assessment instrument and the Waterlow scale. Results. The incidence of pressure ulcers in intensive care unit patients was found to be 14·3%. The majority of pressure ulcers (74%) were grade I. The mean length of time for pressure ulcer development was found to be 10·4 (SD 1·85) days. A statistically significant difference was found in the patients for pressure ulcer development according to their level of consciousness, activity, cooperation, length of stay, Waterlow scale score and C-reactive protein level. In the multiple stepwise logistic regression analysis, the most influential factors for pressure ulcer development were determined to be length of stay and activity level. Conclusions. Extra care needs to be taken to prevent pressure ulcer development in intensive care unit patients who have an extended length of stay, are dependent for activities, have high Waterlow scores, are unconscious and are not cooperative. Relevance to clinical practice. This study determined the incidence of and factors that can affect the development of pressure ulcers in intensive care unit patients who are in a high risk group for the development of pressure ulcers and presented the importance of having Turkish nurses implement interventions directed at these factors. [ABSTRACT FROM AUTHOR]
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- 2009
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23. The potential of microscopic sterile sponge particles to induce foreign body reaction.
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Sari A, Basterzi Y, Karabacak T, Tasdelen B, and Demirkan F
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- 2006
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24. Microribonucleic acid dysregulations in children and adolescents with obsessive–compulsive disorder
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Kandemir H, Erdal ME, Selek S, İzci Ay Ö, Karababa İF, Ay ME, Kandemir SB, Yılmaz ŞG, Ekinci S, Taşdelen B, and Bayazit H
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Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
Hasan Kandemir,1 Mehmet Emin Erdal,2 Salih Selek,3 Özlem İzci Ay,2 İbrahim Fatih Karababa,4 Mustafa Ertan Ay,2 Sultan Basmaci Kandemir,5 Şenay Görücü Yılmaz,2 Suat Ekinci,6 Bahar Taşdelen,7 Hüseyin Bayazit41Department of Child and Adolescent Psychiatry, Faculty of Medicine, Harran University, Sanliurfa, Turkey; 2Department of Medical Biology and Genetics, Faculty of Medicine, Mersin University, Mersin, Turkey; 3Harris County Psychiatric Center, University of Texas Health Science Center at Houston, TX, USA; 4Department of Psychiatry, Faculty of Medicine, Harran University, Sanliurfa, Turkey; 5Department of Psychiatry, Balikligöl State Hospital, Sanliurfa, Turkey; 6Department of Psychiatry, Balikli Rum Hospital, Istanbul, Turkey; 7Department of Biostatistics, Faculty of Medicine, Mersin University, Mersin, TurkeyAim: Obsessive–compulsive disorder (OCD) is a disorder characterized by the presence of obsessions and/or compulsions. Although disorder etiology and pathogenesis remains unknown, several theories about OCD development have been proposed, and many researchers believe that it is caused by both genetic and environmental factors. In the current study, our aim was to investigate miRNA levels in OCD.Methods: In the current study, we evaluated miR18a-5p, miR22-3p, miR24-3p, miR106b-5p, miR107, miR125b-5p, and miR155a-5p levels in child and adolescent OCD patients. The research sample consisted of a group of 23 OCD patients and 40 healthy volunteer controls.Results: There was no significant difference in age and sex between the two groups (P>0.05).The levels of miR22-3p, miR24-3p, miR106b-5p, miR125b-5p, and miR155a-5p were significantly increased in the OCD subjects (P≤0.05). There were no statistically significant differences in miR18a-5p or miR107 levels between groups (P≥0.05).Conclusion: There could be a close relationship between levels of circulating miRNAs and OCD. If we could understand how the signaling pathways arranged by miRNAs impact on central nervous system development, function, and pathology, this understanding could improve our knowledge about OCD etiology and treatment.Keywords: OCD, micro RNA, miRNA, psychiatry, child psychiatry
- Published
- 2015
25. Time dependent vehicle routing problem with fuzzy traveling times under different traffic conditions
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Tufan Demirel, Demirel, N. C., and Tasdelen, B.
26. The views of medical students on elder discrimination
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oya ogenler, Yapici, G., Tasdelen, B., and Akca, T.
27. Distribution of THO1, TPOX, CSF1PO, vWA, D13S317, D7S820 and D16S539 alleles in a Turkish population sample
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Cakir, A. Hadi, Simsek, F., Altunbas, S., and Tasdelen, B.
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- 2001
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28. Headache in idiopathic/genetic epilepsy: Cluster analysis in a large cohort
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Arife Çimen Atalar, Bengi Gül Türk, Esme Ekizoglu, Duygu Kurt Gök, Betül Baykan, Aynur Özge, Semih Ayta, Füsun Ferda Erdoğan, Seher Naz Yeni, Bahar Taşdelen, Sibel K. Velioglu, Zuhal Yapıcı, İpek Midi, Serap Saygı, Ulufer Çelebi, Elif Sarıca Darol, Kadriye Ağan, Senem Ayça, Sibel Gazioğlu, Zeynep Vildan Okudan, Nermin Görkem Şirin, Nerses Bebek, Neşe Dericioğlu, İlknur Güçlü Altun, Ayşe Destina Yalçın, Reyhan Sürmeli, Oğuz Osman Erdinç, Abidin Erdal, Demet İlhan Algın, Gülnihal Kutlu, Semai Bek, Yüksel Erdal, Akçay Övünç Özön, Aylin Reyhani, Babürhan Güldiken, Barış Baklan, Bülent Oğuz Genç, Ebru Aykutlu Altındağ, Gökçen Karahan, Güray Koç, Handan Mısırlı, İbrahim Öztura, Kezban Aslan‐Kara, Merve Melodi Çakar, Nur Türkmen, Onur Bulut, Ömer Karadaş, Özlem Kesim Şahin, Sevgi Ferik, Mehmet Taylan Peköz, Pınar Topaloğlu, Sibel Üstün Özek, Ülkühan Düzgün, Vildan Yayla, Yasemin Gömceli, Zeynep Ünlüsoy Acar, and Atalar A. C., TÜRK B. G., Ekizoglu E., Gok D. K., BAYKAL B., ÖZGE A., Ayta S., ERDOĞAN F. F., YENİ S. N., Tasdelen B., et al.
- Subjects
Adult ,Adolescent ,CHILDHOOD ,UNITED-STATES ,CHILDREN ,idiopathic epilepsy ,CLINICAL NEUROLOGY ,Sağlık Bilimleri ,Clinical Medicine (MED) ,CLASSIFICATION ,MIGRALEPSY ,MECHANISMS ,Cohort Studies ,Nöroloji ,Seizures ,Health Sciences ,Cluster Analysis ,Humans ,Klinik Tıp (MED) ,JUVENILE MYOCLONIC EPILEPSY ,Child ,KLİNİK NÖROLOJİ ,Internal Medicine Sciences ,Klinik Tıp ,headache phenotypes ,Myoclonic Epilepsy, Juvenile ,Headache ,Life Sciences ,Electroencephalography ,Dahili Tıp Bilimleri ,CLINICAL MEDICINE ,Tıp ,PREVALENCE ,MIGRAINE ,Neurology ,Medicine ,myoclonic seizures ,Epilepsy, Generalized ,genetic epilepsy ,Neurology (clinical) ,BURDEN - Abstract
© 2022 International League Against Epilepsy.Objective: The link between headache and epilepsy is more prominent in patients with idiopathic/genetic epilepsy (I/GE). We aimed to investigate the prevalence of headache and to cluster patients with regard to their headache and epilepsy features. Methods: Patients aged 6–40 years, with a definite diagnosis of I/GE, were consecutively enrolled. The patients were interviewed using standardized epilepsy and headache questionnaires, and their headache characteristics were investigated by experts in headache. Demographic and clinical variables were analyzed, and patients were clustered according to their epilepsy and headache characteristics using an unsupervised K-means algorithm. Results: Among 809 patients, 508 (62.8%) reported having any type of headache; 87.4% had interictal headache, and 41.2% had migraine. Cluster analysis revealed two distinct groups for both adults and children/adolescents. In adults, subjects having a family history of headache, ≥5 headache attacks, duration of headache ≥ 24 months, headaches lasting ≥1 h, and visual analog scale scores > 5 were grouped in one cluster, and subjects with juvenile myoclonic epilepsy (JME), myoclonic seizures, and generalized tonic–clonic seizures (GTCS) were clustered in this group (Cluster 1). Self-limited epilepsy with centrotemporal spikes and epilepsy with GTCS alone were clustered in Cluster 2 with the opposite characteristics. For children/adolescents, the same features as in adult Cluster 1 were clustered in a separate group, except for the presence of JME syndrome and GTCS alone as a seizure type. Focal seizures were clustered in another group with the opposite characteristics. In the entire group, the model revealed an additional cluster, including patients with the syndrome of GTCS alone (50.51%), with ≥5 attacks, headache lasting >4 h, and throbbing headache; 65.66% of patients had a family history of headache in this third cluster (n = 99). Significance: Patients with I/GE can be clustered into distinct groups according to headache features along with seizures. Our findings may help in management and planning for future studies.
- Published
- 2022
29. Wound Infiltration with Bupivacaine and Intramuscular Diclofenac Reduces Postoperative Tramadol Consumption in Patients Undergoing Radical Retropubic Prostatectomy: A Prospective, Double-blind, Placebo-controlled, Randomized Study.
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Bilgin TE, Bozlu M, Atici S, Cayan S, and Tasdelen B
- Published
- 2011
30. T1 and T2 measurements across multiple 0.55T MRI systems using open-source vendor-neutral sequences.
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Keenan KE, Tasdelen B, Javed A, Ramasawmy R, Rizzo R, Martin MN, Stupic KF, Seiberlich N, Campbell-Washburn AE, and Nayak KS
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- Humans, Reproducibility of Results, Male, Adult, Female, Algorithms, Image Interpretation, Computer-Assisted methods, Image Processing, Computer-Assisted methods, Equipment Design, Sensitivity and Specificity, Magnetic Resonance Imaging methods, Phantoms, Imaging
- Abstract
Purpose: To compare T1 and T2 measurements across commercial and prototype 0.55T MRI systems in both phantom and healthy participants using the same vendor-neutral pulse sequences, reconstruction, and analysis methods., Methods: Standard spin echo measurements and abbreviated protocol measurements of T1, B1, and T2 were made on two prototype 0.55 T systems and two commercial 0.55T systems using an ISMRM/NIST system phantom. Additionally, five healthy participants were imaged at each system using the abbreviated protocol for T1, B1, and T2 measurement. The phantom measurements were compared to NMR-based reference measurements to determine accuracy, and both phantom and in vivo measurements were compared to assess reproducibility and differences between the prototype and commercial systems., Results: Vendor-neutral sequences were implemented across all four systems, and the code for pulse sequences and reconstruction is freely available. For participants, there was no difference in the mean T1 and T2 relaxation times between the prototype and commercial systems. In the phantom, there were no significant differences between the prototype and commercial systems for T1 and T2 measurements using the abbreviated protocol., Conclusion: Quantitative T1 and T2 measurements at 0.55T in phantom and healthy participants are not statistically different across the prototype and commercial systems., (© 2024 International Society for Magnetic Resonance in Medicine. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.)
- Published
- 2025
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31. Improved abdominal T1 weighted imaging at 0.55T.
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Tasdelen B, Lee NG, Cui SX, and Nayak KS
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- Humans, Imaging, Three-Dimensional methods, Liver diagnostic imaging, Algorithms, Male, Adult, Image Processing, Computer-Assisted methods, Female, Adipose Tissue diagnostic imaging, Image Interpretation, Computer-Assisted methods, Magnetic Resonance Imaging methods, Abdomen diagnostic imaging
- Abstract
Purpose: Breath-held fat-suppressed volumetric T1-weighted MRI is an important and widely-used technique for evaluating the abdomen. Both fat-saturation and Dixon-based fat-suppression methods are used at conventional field strengths; however, both have challenges at lower field strengths (<1.5T) due to insufficient fat suppression and/or inadequate resolution. Specifically, at lower field strengths, fat saturation often fails due to the short T1 of lipid; and Cartesian Dixon imaging provides poor spatial resolution due to the need for a long ΔTE, due to the smaller Δf between water and lipid. The purpose of this work is to demonstrate a new approach capable of simultaneously achieving excellent fat suppression and high spatial resolution on a 0.55T whole-body system., Methods: We applied 3D stack-of-spirals Dixon imaging at 0.55T, with compensation of concomitant field phase during reconstruction. The spiral readouts make efficient use of the requisite ΔTE. We compared this with 3D Cartesian Dixon imaging. Experiments were performed in 2 healthy and 10 elevated liver fat volunteers., Results: Stack-of-spirals Dixon imaging at 0.55T makes excellent use of the required ΔTE, provided high SNR efficiency and finer spatial resolution (1.7 × 1.7 × 5 mm
3 ) compared Cartesian Dixon (3.5 × 3.5 × 5 mm3 ), within a 17-s breath-hold. We observed successful fat suppression, and improved definition of structures such as the liver, kidneys, and bowel., Conclusion: We demonstrate that high-resolution single breath-hold volumetric abdominal T1-weighted imaging is feasible at 0.55T using spiral sampling and concomitant field correction. This is an attractive alternative to existing Cartesian-based methods, as it simultaneously provides high-resolution and excellent fat-suppression., (© 2024 The Author(s). Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine.)- Published
- 2024
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32. Distinct Food Triggers for Migraine, Medication Overuse Headache and Irritable Bowel Syndrome.
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Ceren Akgor M, Vuralli D, Sucu DH, Gokce S, Tasdelen B, Gultekin F, and Bolay H
- Abstract
Background: Irritable bowel syndrome (IBS) is an under-diagnosed common health problem that impairs quality of life. Migraine and IBS are comorbid disorders that are triggered by foods. We aim to investigate IBS frequency in medication overuse headache (MOH) patients and identify food triggers and food avoidance behavior., Methods: Participants who completed the cross-sectional, observational and online survey were included ( n = 1118). Demographic data, comorbid disorders, medications used, presence of headache, the diagnostic features of headache and IBS, migraine related subjective cognitive symptoms scale (MigSCog), consumption behavior of patients regarding 125 food/food additives and food triggers were asked about in the questionnaire., Results: Migraine and MOH diagnoses were made in 88% and 30.7% of the participants, respectively. Non-steroidal anti-inflammatory drugs (NSAIDs) were the main overused drug (89%) in MOH patients. IBS symptoms were present in 35.8% of non-headache sufferers, 52% of migraine patients and 65% of MOH patients. Specific food triggers for MOH patients were dopaminergic and frequently consumed as healthy foods such as banana, apple, cherry, apricot, watermelon, olive, ice cream and yogurt. MigSCog scores were significantly higher in episodic migraine and MOH patients when IBS symptoms coexisted., Conclusions: The frequency of IBS was higher in MOH patients compared to migraine patients. Coexistence of IBS seems to be a confounding factor for cognitive functions. MOH specific triggers were mostly dopaminergic foods, whereas migraine specific food triggers were mostly histaminergic and processed foods. Personalized diets focusing on food triggers and interference with leaky gut must be integrated to MOH and migraine treatment to achieve sustainable management of these disorders.
- Published
- 2023
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33. Body composition profiling at 0.55T: Feasibility and precision.
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Nayak KS, Cui SX, Tasdelen B, Yagiz E, Weston S, Zhong X, and Ahlgren A
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- Adult, Humans, Middle Aged, Feasibility Studies, Body Composition, Water, Adipose Tissue diagnostic imaging, Magnetic Resonance Imaging methods
- Abstract
Purpose: Body composition MRI captures the distribution of fat and lean tissues throughout the body, and provides valuable biomarkers of obesity, metabolic disease, and muscle disorders, as well as risk assessment. Highly reproducible protocols have been developed for 1.5T and 3T MRI. The purpose of this work was to demonstrate the feasibility and test-retest repeatability of MRI body composition profiling on a 0.55T whole-body system., Methods: Healthy adult volunteers were scanned on a whole-body 0.55T MRI system using the integrated body RF coil. Experiments were performed to refine parameter settings such as TEs, resolution, flip angle, bandwidth, acceleration, and oversampling factors. The final protocol was evaluated using a test-retest study with subject removal and replacement in 10 adult volunteers (5 M/5F, age 25-60, body mass index 20-30)., Results: Compared to 1.5T and 3T, the optimal flip angle at 0.55T was higher (15°), due to the shorter T1 times, and the optimal echo spacing was larger, due to smaller chemical shift between water and fat. Overall image quality was comparable to conventional field strengths, with no significant issues with fat/water swapping or inadequate SNR. Repeatability coefficient of visceral fat, subcutaneous fat, total thigh muscle volume, muscle fat infiltration, and liver fat were 11.8 cL (2.2%), 46.9 cL (1.9%), 14.6 cL (0.5%), 0.1 pp (2%), and 0.2 pp (5%), respectively (coefficient of variation in parenthesis)., Conclusions: We demonstrate that 0.55T body composition MRI is feasible and present optimized scan parameters. The resulting images provide satisfactory quality for automated post-processing and produce repeatable results., (© 2023 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine.)
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- 2023
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34. Wound healing activity of Salvia huberi ethanolic extract in streptozocin-induced diabetic rats.
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Ozay Y, Ozkorkmaz EG, Kumas-Kulualp M, Kara SG, Yildirim Z, Uzun C, Celik A, Camlica Y, Bozgeyik I, Guler G, Erdal N, Yumrutas O, Tasdelen B, and Kahraman A
- Subjects
- Male, Animals, Rats, Streptozocin adverse effects, Plant Extracts pharmacology, Plant Extracts therapeutic use, Ointments therapeutic use, Rats, Wistar, Wound Healing, Ethanol adverse effects, Diabetes Mellitus, Experimental drug therapy, Diabetes Mellitus, Experimental chemically induced, Salvia, Surgical Wound drug therapy
- Abstract
Objective: The aim of this study was to examine the in vivo wound healing potential of Salvia huberi Hedge (endemic to Turkey) on excision and incision wound models in diabetic rats. Method: Male Wistar albino rats, 3-4 months old and weighing 180-240g were used. The animals were randomly divided into five groups including Control, Vehicle and Fito reference, and two different concentrations (0.5% and 1% weight/weight (w/w)) of ethanol extract of Salvia huberi were investigated in both wound models on streptozocin-induced diabetic rats using macroscopic, biomechanical, biochemical, histopathological, genotoxic and gene expression methods over both seven and 14 days. Fito cream (Tripharma Drug Industry and Trade Inc., Turkey) was used as the reference drug. Results: A total of 60 rats were used in this study. Salvia huberi ointments at 0.5% and 1% (w/w) concentrations and Fito cream showed 99.3%, 99.4% and 99.1% contraction for excision wounds, and 99.9%, 97.0% and 99% contraction for incision wounds, respectively. In Salvia huberi ointments and Fito cream groups, re-epithelialisation increased dramatically by both day 7 and day 14 (p<0.05). By day 14, low hydroxyproline and malondialdehyde (MDA) levels, and high glutathione (GSH) levels were observed in the Salvia huberi ointment groups. After two application periods, damaged cell percent and genetic damage index values and micronucleus frequency of Salvia huberi ointment treatment groups were lower than Control and Vehicle groups (p<0.001). A growth factor expression reached a high level by day 7 in the Control group; in Salvia huberi -treated groups it was decreased. Conclusion: The study showed that application of Salvia huberi ointments ameliorated the healing process in diabetic rats with excisional and incisional wounds and may serve as a potent healing agent.
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- 2023
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35. Effect of abdominal massage on bowel evacuation in neurosurgical intensive care patients.
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Altun Ugras G, Yüksel S, Isik MT, Tasdelen B, Dogan H, and Mutluay O
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- Critical Care, Humans, Prospective Studies, Constipation etiology, Constipation therapy, Massage methods
- Abstract
Background: There are many factors, which affect the bowel evacuation of neurosurgical intensive care unit (NICU) patients, resulting in constipation., Aim and Objectives: The aim of this study was to investigate effect of abdominal massage on bowel evacuation and the risk of constipation in NICU patients., Design: A prospective, randomized-controlled clinical trial., Methods: The sample of this study included 80 NICU patients. The patients were randomly assigned to abdominal massage and control groups. The constipation risk of all the patients was assessed with Constipation Risk Assessment Scale (CRAS). The patients in the abdominal massage group received a total of 30 minutes of massage, 15 minutes every morning and evening, until the first defecation. The bowel sounds of all patients in the abdominal massage and control groups were assessed on a daily basis. The days when bowel sounds were heard and the first defecation took place were recorded in a Bowel Evacuation Form., Results: The risk of constipation was higher in the patients in the abdominal massage (CRAS score 19.02 ± 1.81) and control groups (CRAS score 20.45 ± 2.61). The time of return of bowel sounds and the time of the first defecation were earlier in the abdominal massage group, compared to the control group (P < .05). In the control group, there was a weak correlation (P = .004) between the CRAS score and the time of return of bowel sounds, while there was a moderate correlation between the CRAS score and the time of the first defecation (P < .001)., Conclusion: Our study results show that the risk of constipation is high in NICU patients, and abdominal massage is an effective nursing intervention to shorten the time of return of bowel sounds and the time of the first defecation., Relevance to Clinical Practice: Nurses can safely apply abdominal massage to improve bowel evacuation in NICU patients., (© 2020 British Association of Critical Care Nurses.)
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- 2022
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36. Cluster Analysis Revealed Two Hidden Phenotypes of Cluster Headache.
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Yalinay Dikmen P, Ari C, Sahin E, Ertas M, Mayda Domac F, Ilgaz Aydinlar E, Sahin A, Ozge A, Ozguner H, Karadas O, Shafiyev J, Vuralli D, Aktan C, Oguz-Akarsu E, Karli N, Zarifoglu M, Bolay H, Ekizoglu E, Kocasoy Orhan E, Tasdelen B, and Baykan B
- Abstract
Objective: To investigate the possible subgroups of patients with Cluster Headache (CH) by using K-means cluster analysis., Methods: A total of 209 individuals (mean (SD) age: 39.8 (11.3) years), diagnosed with CH by headache experts, participated in this cross-sectional multi-center study. All patients completed a semi-structured survey either face to face, preferably, or through phone interviews with a physician. The survey was composed of questions that addressed sociodemographic characteristics as well as detailed clinical features and treatment experiences., Results: Cluster analysis revealed two subgroups. Cluster one patients ( n = 81) had younger age at diagnosis (31.04 (9.68) vs. 35.05 (11.02) years; p = 0.009), a higher number of autonomic symptoms (3.28 (1.16) vs. 1.99(0.95); p < 0.001), and showed a better response to triptans (50.00% vs. 28.00; p < 0.001) during attacks, compared with the cluster two subgroup ( n = 122). Cluster two patients had higher rates of current smoking (76.0 vs. 33.0%; p=0.002), higher rates of smoking at diagnosis (78.0 vs. 32.0%; p=0.006), higher rates of parental smoking/tobacco exposure during childhood (72.0 vs. 33.0%; p = 0.010), longer duration of attacks with (44.21 (34.44) min. vs. 34.51 (24.97) min; p=0.005) and without (97.50 (63.58) min. vs. (83.95 (49.07) min; p = 0.035) treatment and higher rates of emergency department visits in the last year (81.0 vs. 26.0%; p < 0.001)., Conclusions: Cluster one and cluster two patients had different phenotypic features, possibly indicating different underlying genetic mechanisms. The cluster 1 phenotype may suggest a genetic or biology-based etiology, whereas the cluster two phenotype may be related to epigenetic mechanisms. Toxic exposure to cigarettes, either personally or secondarily, seems to be an important factor in the cluster two subgroup, inducing drug resistance and longer attacks. We need more studies to elaborate the causal relationship and the missing links of neurobiological pathways of cigarette smoking regarding the identified distinct phenotypic classes of patients with CH., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Yalinay Dikmen, Ari, Sahin, Ertas, Mayda Domac, Ilgaz Aydinlar, Sahin, Ozge, Ozguner, Karadas, Shafiyev, Vuralli, Aktan, Oguz-Akarsu, Karli, Zarifoglu, Bolay, Ekizoglu, Kocasoy Orhan, Tasdelen and Baykan.)
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- 2022
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37. Analysis and mitigation of noise in simultaneous transmission and reception in MRI.
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Tasdelen B, Sadeghi-Tarakameh A, Yilmaz U, and Atalar E
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- Equipment Design, Signal-To-Noise Ratio, Amplifiers, Electronic, Magnetic Resonance Imaging
- Abstract
Purpose: In simultaneous transmission and reception (STAR) MRI, along with the coupling of the excitation pulse to the received signal, noise, and undesired distortions (spurs) coming from the transmit chain also leak into the acquired signal and degrade image quality. Here, properties of this coupled noise and its relationship with the transmit amplifier gain, transmit chain noise density, isolation performance, and imaging bandwidth are analyzed. It is demonstrated that by utilizing a recently proposed STAR technique, the transmit noise can be reduced. The importance of achieving high isolation and careful selection of the corresponding parameters are demonstrated., Theory and Methods: A cancellation algorithm, together with a vector modulator, is used for transmit-receive isolation. The scanner is modeled as a pipeline of blocks to demonstrate the noise contribution from each block. With higher isolation, coupled transmit noise can be reduced to the point that the dominant noise source becomes acquisition noise, as in the case for pulsed MRI. Amplifiers with different gain and noise properties are used in the experiments to verify the derived noise-transmit parameter relation., Results: With the proposed technique, more than 80 dB isolation in the analog domain is achieved. The leakage noise and the spurs coupled from the transmit chain, are reduced. It is shown that the transmit gain plays the most critical role in determining sufficient isolation, whereas the amplifier noise figure does not contribute as much., Conclusion: The transmit noise and the spurs in STAR imaging are analyzed and mitigated by using a vector modulator., (© 2021 International Society for Magnetic Resonance in Medicine.)
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- 2021
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38. HMGB1, NLRP3, IL-6 and ACE2 levels are elevated in COVID-19 with headache: a window to the infection-related headache mechanism.
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Bolay H, Karadas Ö, Oztürk B, Sonkaya R, Tasdelen B, Bulut TDS, Gülbahar Ö, Özge A, and Baykan B
- Subjects
- Cross-Sectional Studies, Headache, Humans, Interleukin-6, NLR Family, Pyrin Domain-Containing 3 Protein, Peptidyl-Dipeptidase A, SARS-CoV-2, COVID-19, HMGB1 Protein
- Abstract
Background and Aim: Pathogenesis of COVID-19 -related headache is unknown, though the induction of the trigeminal neurons through inflammation is proposed. We aimed to investigate key systemic circulating inflammatory molecules and their clinical relations in COVID-19 patients with headache., Methods: This cross-sectional study enrolled 88 COVID-19 patients, hospitalized on a regular ward during the second wave of the pandemic. Clinical characteristics of COVID-19 patients were recorded, and laboratory tests were studied., Results: The mean ages of 48 COVID-19 patients with headache (47.71 ± 10.8) and 40 COVID-19 patients without headache (45.70 ± 12.72) were comparable. COVID-19 patients suffered from headache had significantly higher serum levels of HMGB1, NLRP3, ACE2, and IL-6 than COVID-19 patients without headache, whereas CGRP and IL-10 levels were similar in the groups. Angiotensin II level was significantly decreased in the headache group. COVID-19 patients with headache showed an increased frequency of pulmonary involvement and increased D- dimer levels. Furthermore, COVID-19 was more frequently associated with weight loss, nausea, and diarrhea in patients with headache. Serum NLRP3 levels were correlated with headache duration and hospital stay, while headache response to paracetamol was negatively correlated with HMGB1 and positively associated with IL-10 levels., Conclusion: Stronger inflammatory response is associated with headache in hospitalized COVID-19 patients with moderate disease severity. Increased levels of the circulating inflammatory and/or nociceptive molecules like HMGB1, NLRP3, and IL-6 may play a role in the potential induction of the trigeminal system and manifestation of headache secondary to SARS-CoV-2 infection., (© 2021. The Author(s).)
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- 2021
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39. SNR Weighting for Shear Wave Speed Reconstruction in Tomoelastography.
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Ariyurek C, Tasdelen B, Ider YZ, and Atalar E
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- Computer Simulation, Humans, Magnetic Resonance Imaging, Phantoms, Imaging, Reproducibility of Results, Elasticity Imaging Techniques, Image Processing, Computer-Assisted, Signal-To-Noise Ratio, Tomography
- Abstract
In tomoelastography, to achieve a final wave speed map by combining reconstructions obtained from all spatial directions and excitation frequencies, the use of weights is inevitable. Here, a new weighting scheme, which maximizes the signal-to-noise ratio (SNR) of the final wave speed map, has been proposed. To maximize the SNR of the final wave speed map, the use of squares of estimated SNR values of reconstructed individual maps has been proposed. Therefore, derivations of the SNR of the reconstructed wave speed maps have become necessary. Considering the noise on the complex MRI signal, the SNR of the reconstructed wave speed map was formulated by an analytical approach assuming a high SNR, and the results were verified using Monte Carlo simulations (MCSs). It has been assumed that the noise remains approximately Gaussian when the image SNR is high enough, despite the nonlinear operations in tomoelastography inversion. Hence, the SNR threshold was determined by comparing the SNR computed by MCSs and analytical approximations. The weighting scheme was evaluated for accuracy, spatial resolution and SNR performances on simulated phantoms. MR elastography (MRE) experiments on two different phantoms were conducted. Wave speed maps were generated for simulated 3D human abdomen MRE data and experimental human abdomen MRE data. The simulation results demonstrated that the SNR-weighted inversion improved the SNR performance of the wave speed map by a factor of two compared to the performance of the original (i.e., amplitude-weighted) reconstruction. In the case of a low SNR, no bias occurred in the wave speed map when SNR weighting was used, whereas 10% bias occurred when the original weighting (i.e., amplitude weighting) was used. Thus, while not altering the accuracy or spatial resolution of the wave speed map with the proposed weighting method, the SNR of the wave speed map has been significantly improved., (© 2020 John Wiley & Sons, Ltd.)
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- 2021
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40. The factors of pancreatic fistula development in patients who underwent classical pancreaticoduodenectomy.
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Sert OZ, Berkesoglu M, Canbaz H, Olmez A, Tasdelen B, and Dirlik MM
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- Anastomosis, Surgical, Humans, Postoperative Complications epidemiology, Postoperative Complications etiology, Retrospective Studies, Risk Factors, Pancreatic Fistula epidemiology, Pancreatic Fistula etiology, Pancreaticoduodenectomy adverse effects
- Abstract
Aim: Pancreatic fistula (PF) and anastomotic leakage are significant complications of the pancreaticoduodenectomy (PD). The PF is considered as the root cause of other major complications of PD. The aim of the study was to investigate the risk factors underlying PF that occurred after PD and the effects of the PF on postoperative morbidity., Material and Methods: In this study, fifty patients who underwent classic PD were evaluated, retrospectively. Patients were divided into two groups as patients with PF and patients without PF. The following demographical, clinical and operative parameters were collected to evaluate the PF; age, gender, preoperative biochemical parameters, resection type, duration of the operation, patient's comorbidities, amount of perioperative transfusion, localization of the tumour, texture of the residual pancreas, type of the anastomosis and the diameter of the pancreatic duct., Results: A statistically significant relation was found between the texture of the remnant pancreatic parenchyma and PF (p<0.001). A significant relation was determined between PF and preoperative ALP, GGT, AST, ALT, hemoglobin levels and length of the hospitalization (p<0.05). In this study, we found that mortality, abdominal bleeding, bile leakage, intra-abdominal abscess were associated with reoperation and prolonged hospitalization., Conclusion: The lack of internationally accepted definition of a fistula is an important issue. Preoperative high ALP, ALT, AST, GGT values, low hemoglobin values and soft texture of remnant pancreatic tissue were found to be related with PF that occurs after PD. Residual pancreatic tissue has been shown as an independent risk factor., Key Words: ISPGF, Pancreaticoduodenectomy, Pancreatic fistula, Risk factors.
- Published
- 2021
41. Clinical characteristics and cost of hospital stay of octogenarians and nonagenarians in intensive care nephrology unit.
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Bardak S, Demir S, Dolarslan ME, Karadurmus B, Akcali E, Turgutalp K, Tasdelen B, and Kiykim A
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- Age Factors, Aged, Aged, 80 and over, Female, Humans, Male, Nephrology, Retrospective Studies, Hospital Costs, Intensive Care Units economics, Length of Stay economics, Urologic Diseases economics, Urologic Diseases therapy
- Abstract
Purpose: As the population gets older, the elderly and very elderly patients are increasingly been treated in nephrology intensive care units (ICU). In this study we evaluated the characteristics and outcomes of the octogenarians (80-89 years old), nonagenarians (≥ 90 years old) and compared them with elderly (65-79 years old) patients treated in nephrology ICU., Methods: Eighteen nonagenarians, 70 octogenarians and 88 elderly patients were included in the study. Indication for hospitalization, presence of comorbid diseases, and requirement for acute dialysis treatment were investigated. Need for mechanical ventilation, vasopressors, central venous catheterization, urinary catheterization, anticoagulation, and transfusion of blood products were evaluated. Mortality rate and hospital cost were calculated. Data about survival at 1 month after discharge was collected., Results: Causes of hospitalization, need for dialysis treatment, mechanical ventilation, vasopressors, central venous catheterization, urinary catheterization, anticoagulation, and transfusion of blood products were not different between age groups. Diabetes mellitus and malignancy were more frequent in elderly, whereas dementia/Alzheimer's disease was more common in nonagenarians. Although, mortality in ICU was increased as the age increased, it was statistically insignificant. However, 1 month mortality rate after discharge from hospital was increased especially in nonagenarians. In nonagenarians infection, whereas in octogenarians need for dialysis treatment, were related with mortality. Length of intensive care stay and hospital cost did not differ between age groups., Conclusion: Length of nephrology intensive care stay, mortality rate and hospital cost did not differ for very elderly age groups, but mortality risk was higher for nonagenarians after discharge from hospital.
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- 2021
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42. Biochemical, Histopathologic, and Genotoxic Effects of Ethanol Extract of Salvia hypargeia (Fisch. & Mey.) on Incisional and Excisional Wounded Diabetic Rats.
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Ozay Y, Guzel S, Gokalp Ozkorkmaz E, Kumas M, Uzun C, Yıldırım Z, Celik A, Camlıca Y, Yumrutas O, Guler G, Erdal N, Tasdelen B, Didem Celikcan H, and Kahraman A
- Subjects
- Animals, DNA Damage, Ethanol, Humans, Male, Plant Extracts, Rats, Rats, Wistar, Skin, Diabetes Mellitus, Experimental, Salvia
- Abstract
Purpose : Nonhealing wounds are a serious problem of diabetic patients. Salvia species are traditionally used for the treatment of wounds. The aim of the study was to investigate the effects of ointment prepared with ethanol extract obtained from the aerial parts of Salvia hypargeia , an endemic plant from Turkey, on diabetic rat incisional and excisional skin wounds. Materials and Methods : Male Wistar albino rats ( n : 60) were divided into five groups. Diabetes was induced and two concentrations (0.5% and 1%) of the extract were used for ointments and applied on wounds for 7 and 14 days. Fito cream was chosen as a reference drug. Results : In excisional wounds, healing ratios of 0.5% (63.4% and 99.3%) and 1% (65.5% and 99.9%) S. hypargeia groups were higher compared to control (35.9% and 75.1%), and in incisional wounds, healing ratios of 0.5% (78.1% and 98.5%) and 1% (84.4% and 99.4%) S. hypargeia groups were higher compared to control (30.5% and 72.9%) ( p < .01). Hydroxyproline (0.31 ± 0.3 and 0.34 ± 0.2) levels were lower and GSH (10.7 ± 3.1 and 7.6 ± 0.9) levels were higher in 0.5% and 1% S. hypargeia groups on the 14th day ( p < .01). Histopathological results revealed re-epithelialization and formation of granulation tissue in all S. hypargeia groups. Genotoxicologic results indicated, GDI, DCP values, and MN frequency of 0.5% and 1% S. hypargeia groups did not reach to significant levels both on the 7 and 14 days. Conclusions : S. hypargeia may have a potential for therapeutic use in treatment and management of diabetic wounds with a successful topical application.
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- 2021
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43. A Study Investigating the Role of 2 Candidate SNPs in Bax and Bcl-2 Genes in Alzheimer's Disease.
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Erdal ME, Görücü Yilmaz S, Ay ME, Güler Kara H, Avci Özge A, and Tasdelen B
- Subjects
- Aged, Aged, 80 and over, Alleles, Apoptosis genetics, Case-Control Studies, Chi-Square Distribution, Female, Genotype, Humans, Likelihood Functions, Male, Negative Results, Proto-Oncogene Mas, Turkey, Alzheimer Disease genetics, Genes, bcl-2, Polymorphism, Single Nucleotide, Proto-Oncogene Proteins c-bcl-2 genetics, bcl-2-Associated X Protein genetics
- Abstract
Objective: The proto-oncogene Bax (Bcl-2-associated X protein) and related protein Bcl-2 (B-cell chronic lymphocytic leukemia/lymphoma-2) genes are triggers of apoptosis in Alzheimer's disease (AD). The balance of these proteins has an important role in the death or life of a neuronal cell, and the functional polymorphisms in genes expressing these proteins have been found to promote apoptosis. To investigate the role of Bax and Bcl-2 genes in AD, we examined the presence of the 2 polymorphisms in peripheral blood. To our knowledge, this is the first clinical association study of these 2 functional SNPs using the peripheral blood of patients with AD., Methods: Bax (rs4645878) and Bcl-2 (rs2279115) in Alzheimer's patients (N = 132) and healthy controls (N = 109), aged 65 to 85 years, were analyzed by qPCR (Quantitative Polymerase Chain Reaction) using TaqMan probe technology. Statistical analyses were done using SPSS, 11.5. The differences between groups were analyzed using an independent-samples t test. The relationships between genotypes and alleles were analyzed using chi-square or likelihood ratio test. The Hardy-Weinberg balance was checked for the patient and control groups. A p-value of less than 0.05 was taken as significant., Results: Sporadic AD patients and non-demented age matched control subjects were genotyped in this case-control study. No statistically significant relationship was found between the patients and controls for allele or genotype frequencies (p>0.05)., Conclusion: Our data suggest that these two polymorphisms do not contribute to AD in the population from the Mersin region of the Eastern Mediterranean. Further studies with larger sample sizes must be conducted to ascertain the association between the 2 polymorphisms.
- Published
- 2020
44. Comparison of Dorsal Intercostal Artery Perforator Propeller Flaps and Bilateral Rotation Flaps in Reconstruction of Myelomeningocele Defects.
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Tenekeci G, Basterzi Y, Unal S, Sari A, Demir Y, Bagdatoglu C, and Tasdelen B
- Subjects
- Adult, Female, Humans, Male, Middle Aged, Postoperative Complications epidemiology, Retrospective Studies, Surgical Flaps, Meningomyelocele surgery, Perforator Flap, Plastic Surgery Procedures methods
- Abstract
Aim: To compare the complications and surgical outcomes between bilateral rotation flaps and dorsal intercostal artery perforator (DICAP) flaps in the soft tissue reconstruction of myelomeningocele defects., Material and Methods: Between January 2005 and February 2017, we studied 47 patients who underwent reconstruction of myelomeningocele defects. Patient demographics, operative data, and postoperative data were reviewed retrospectively and are included in the study., Results: We found no statistically significant differences in patient demographics and surgical complications between these two groups; this may be due to small sample size. With regard to complications-partial flap necrosis, cerebrospinal fluid (CSF) leakage, necessity for reoperation, and wound infection-DICAP propeller flaps were clinically superior to rotation flaps. Partial flap necrosis was associated with CSF leakage and wound infection, and CSF leakage was associated with wound dehiscence., Conclusion: Although surgical outcomes obtained with DICAP propeller flaps were clinically superior to those obtained with rotation flaps, there was no statistically significant difference between the two patient groups. A well-designed comparative study with adequate sample size is needed. Nonetheless, we suggest using DICAP propeller flaps for reconstruction of large myelomeningocele defects.
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- 2019
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45. Nursing students' attitudes to suicide and suicidal persons: A cross-national and cultural comparison between Turkey and the United Kingdom.
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Flood C, Yilmaz M, Phillips L, Lindsay T, Eskin M, Hiley J, and Tasdelen B
- Subjects
- Adult, Female, Humans, Male, Turkey ethnology, United Kingdom ethnology, Young Adult, Attitude of Health Personnel ethnology, Cross-Cultural Comparison, Health Knowledge, Attitudes, Practice ethnology, Students, Nursing, Suicide ethnology
- Abstract
WHAT IS KNOWN ON THE SUBJECT?: Mental healthcare requires acceptance of suicide and flexible attitudes especially in relation to caring for people who have suicidal thoughts or who have attempted suicide. Nurse education programmes for student nurses can shape positively the attitudes of individual participants, yet limited research exists on what nursing students' attitudes currently are towards people who are suicidal. WHAT THIS PAPER ADDS TO EXISTING KNOWLEDGE?: This paper adds to the developing international comparative work that is providing a greater understanding of cultural perceptions of suicide amongst students. This paper along with existing literature highlights a potential relationship between certain religious belief systems and their potential to be protective against suicide. At the same time, such religious belief is more likely to be associated with more judgmental attitude towards suicidal behaviour. This paper using a validated research tool, devised by a research psychologist, scored for the first time, individual student attitudes towards caring for people that are suicidal, whilst establishing the overall differences between the two countries from which the data are collected. WHAT ARE THE IMPLICATIONS FOR PRACTICE?: This paper offers potential explanations for differences in nursing students' attitudes between the UK and Turkey. Disparities under discussion include gender, type of education, culture and religion. This is an important discussion in the consideration of nurse education worldwide. It is recognized that students may come from a variety of different backgrounds, with varying personal and social attitudes to begin with; yet, there exists the potential to positively influence overall attitudes towards service users whilst learners are still within a training programme, consisting of education and practice experiences. The merits of a specialist mental health nurse training programme and its potential to impact more favourably on students attitudes deserve more attention and research., Abstract: Introduction Suicide is a major public health issue internationally, and the impact of positive or negative attitudes amongst the mental health professional workforce warrants scrutiny. The study aimed to examine English and Turkish nursing students' attitudes towards people with suicidal behaviour. Method This cross-cultural study reports on attitudes of 240 nursing students towards suicide in Turkey and 82 nursing students in the UK. A reliable and valid 24 item "Attitudes towards Suicide Scale" and "Social Reactions to Suicidal Persons Scale" were used to measure attitudes. Results The UK nursing students were found to display more accepting attitudes to suicide, and scored higher on acceptability of suicide, seeing suicide as a solution and open reporting and discussion of suicide subscales than their Turkish counterparts. Turkish nursing students scored higher on punishment after death and hiding suicidal behaviour subscales than the UK students. Turkish nursing students scored significantly higher on deterring subscale of reactions to a suicidal peer scale than the UK nursing students. Implications for practice It is vital for nurse students to develop positive acceptance of suicide through education, reflection and clinical supervision to be more therapeutic towards suicidal patients., (© 2018 John Wiley & Sons Ltd.)
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- 2018
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46. The effect of metilpheniydate, risperidone and combination therapy on ECG in children with attention-deficit hyperactivity disorder.
- Author
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Karpuz D, Hallioglu O, Toros F, and Tasdelen B
- Subjects
- Antipsychotic Agents administration & dosage, Central Nervous System Stimulants administration & dosage, Child, Cross-Sectional Studies, Drug Therapy, Combination, Electrocardiography, Female, Heart Rate drug effects, Humans, Male, Methylphenidate administration & dosage, Prospective Studies, Risperidone administration & dosage, Antipsychotic Agents adverse effects, Arrhythmias, Cardiac chemically induced, Attention Deficit Disorder with Hyperactivity drug therapy, Central Nervous System Stimulants adverse effects, Hypertension chemically induced, Methylphenidate adverse effects, Risperidone adverse effects
- Abstract
Introduction: This study is to investigate ventricular repolarization on electrocardiogram (ECG) in a pediatric population receiving methylphenidate (MPH), risperidone (RIS) and combined therapy., Methods: A total of 215 patients between 6 and 12years with ADHD/conduct disorder receiving methylphenidate, risperidone and combined therapy for minimum 3months and an untreated ADHD group (n=76) was consecutively included in the study. Twelve lead ECG parameters including mean QT, QTc, T-peak to T-end (TpTe) intervals, TpTe dispersion and TpTe/QT ratio were compared., Results: QT interval, and QTc, TpTe interval, TpTe dispersion and TpTe/QTc ratio values for groups receiving RIS, MPH and combined therapy were found to be significantly higher than other groups. Moreover, in the combined therapy group TpTe and TpTe/QTc values were higher than the single drug administration groups (p<0.05). TpTe and TpTe/QT ratio was significantly higher in the RIS group compared to that of the MPH group., Conclusion: These results suggested that combined therapy of these drugs had a more prominent impact on the T wave and RIS could be strongly associated with it., (Copyright © 2017 Elsevier Inc. All rights reserved.)
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- 2017
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47. Therapeutic hypothermia and myocardium in perinatal asphyxia: a microvolt T-wave alternans and Doppler echocardiography study.
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Karpuz D, Celik Y, Giray D, Tasdelen B, and Hallioglu O
- Subjects
- Arrhythmias, Cardiac, Asphyxia Neonatorum physiopathology, Cardiomyopathies, Case-Control Studies, Echocardiography, Echocardiography, Doppler, Electrocardiography, Female, Heart physiopathology, Humans, Hypoxia-Ischemia, Brain physiopathology, Infant, Newborn, Male, Myocardium, Prognosis, Ventricular Function, Left, Ventricular Function, Right, Asphyxia Neonatorum therapy, Heart diagnostic imaging, Hypothermia, Induced, Hypoxia-Ischemia, Brain therapy
- Abstract
Objectives: This is the first study evaluating the predictive value of myocardial performance on arrhythmia and mortality via tissue-Doppler and microvolt T-wave alternans in infants with hypoxic-ischemic encephalopathy treated with therapeutic hypothermia-rewarming., Methods: The study included 23 term newborns having criteria for hypoxic-ischemic encephalopathy, and 12 controls. Tissue-Doppler imaging and T-wave alternans were performed in the first six hours after birth in patients from both groups and after hypothermia-rewarming treatment on the fifth day., Results: The basal T-wave alternans values were higher in patients in lead aVF(p < 0.001) which also correlated with existing acidemia (r = 0.517; p = 0.012). Basal T-wave alternans and post‑treatment values of patients were compared in leads V1 (p < 0.001) and aVF (p < 0.001); a significant decrease was found on the fifth day. Moreover, right ventricle diastolic diameter and estimated systolic pulmonary artery pressure of patients in the first 6 hours were higher (p = 0.03, p < 0.001, respectively). Although, the ejection fraction of patients did not decrease, basal values of left and right ventricular systolic and diastolic functions were lower initially, and increased significantly after treatment., Conclusion: The global cardiac functions and myocardial performance of newborns with hypoxic-ischemia might be improved with therapeutic hypothermia which can be determined by using T-wave alternans and tissue-Doppler measurements. However, further studies are needed to assess whether these measurements are prognostic in determining the myocardial dysfunction and arrhythmias (Tab. 2, Fig. 3, Ref. 26).
- Published
- 2017
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48. Clinical and histopathological relationship of sildenafil and bosentan treatments in rats with monocrotaline induced pulmonary hypertension.
- Author
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Karpuz D, Hallioglu O, Buyukakilli B, Gurgul S, Balli E, Ozeren M, and Tasdelen B
- Subjects
- Animals, Bosentan, Drug Therapy, Combination, Hypertension, Pulmonary chemically induced, Hypertension, Pulmonary pathology, Lung pathology, Male, Rats, Rats, Wistar, Antihypertensive Agents pharmacology, Hypertension, Pulmonary drug therapy, Lung drug effects, Monocrotaline toxicity, Phosphodiesterase 5 Inhibitors pharmacology, Sildenafil Citrate pharmacology, Sulfonamides pharmacology
- Abstract
Background: Pulmonary arterial hypertension (PAH) is a challenging disorder characterized by increasing pulmonary artery pressure, which is hard to treat., Objective: This study was aimed to investigate the effects of bosentan, sildenafil and their combination., Methods: Saline or MCT were applied to Wistar rats. By the development of PAH (4th week), MCT-given rats were treated orally with bosentan, sildenafil and combination of sildenafil and bosentan or placebo. ECHO examinations were performed. Tissues obtained from all of the rats were evaluated under an electron microscope., Results: Left ventricular end diastolic diameter significantly increased in sildenafil and combined groups. Sildenafil group revealed a significant decrease in RV pressure and wall thickness. Examination of lung revealed a significant amount of connective tissue formation and increase in inflammatory cells in all the groups except controls in the interalveolar septum. Examination of PA revealed an increase in connective tissue volume, hypertrophic changes and expansions in granular endoplasmic reticulum cisternaes in smooth muscle cells in active groups rather than in the controls. Unlike the controls, the examination of the RV revealed an enlargement of the sarcoplasmic reticulum cisternaes in some cells, due to the calcium increase., Conclusion: Sildenafil and the combined therapy demonstrated to have more impact on pressure and the RV parameters in rats, with lower inflammatory findings in lung tissue (Fig. 6, Ref. 31).
- Published
- 2017
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49. Quality of life, clinical effectiveness, and satisfaction in patients with beta thalassemia major and sickle cell anemia receiving deferasirox chelation therapy.
- Author
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Senol SP, Tiftik EN, Unal S, Akdeniz A, Tasdelen B, and Tunctan B
- Abstract
Objectives: There is a need to remove excess iron with iron chelation therapy (ICT) to avoid the serious clinical sequelae associated with iron overload in patients with beta thalassemia major (BTM) and sickle cell anemia (SCA). Due to the effects of the diseases and their treatments, ICT is still a major reason for unsatisfactory compliance. The aim of this single-center observational study was to evaluate the quality of life, clinical effectiveness, and satisfaction in pediatric and adult patients with BTM and SCA receiving deferasirox (DFX) chelation therapy., Methods: In this study, 37 pediatric and 35 adult patients with BTM or SCA receiving DFX for at least 6 months participated. Upon receipt of Informed Consent Form, Case Report Form, Demographic Data Collection Form, Child Health Questionnaire-Parent Form, Life Quality Survey Short Form-36, and ICT Satisfaction Survey were used to obtain data for the effectiveness of ICT and parameters that may affect compliance to treatment and life quality of the participants., Results: As a main index for the effectiveness of DFX chelation therapy, serum ferritin levels were higher than the normal values in the patients receiving DFX. The increased ferritin levels were also associated with hematological and biochemical abnormalities. Our findings regarding quality of life and satisfaction with DFX chelation therapy indicated that the patients with BTM or SCA had lower scores. Overall, problems with treatment regimen and side effects appeared to be common causes of poor compliance to DFX chelation therapy., Conclusions: Our findings suggest that health care providers should be aware of the importance of monitoring iron load with timely initiation of DFX chelation therapy and ongoing adjustments to chelation regimens and/or transfusion methods to decrease hospitalizations and improve compliance to ICT of the patients with BTM and SCA.
- Published
- 2016
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50. Effects of Atomoxetine and Osmotic Release Oral System-Methylphenidate on Executive Functions in Patients with Combined Type Attention-Deficit/Hyperactivity Disorder.
- Author
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Ince Tasdelen B, Karakaya E, and Oztop DB
- Subjects
- Administration, Oral, Adrenergic Uptake Inhibitors adverse effects, Adrenergic Uptake Inhibitors therapeutic use, Atomoxetine Hydrochloride adverse effects, Attention Deficit Disorder with Hyperactivity psychology, Central Nervous System Stimulants administration & dosage, Central Nervous System Stimulants adverse effects, Central Nervous System Stimulants therapeutic use, Child, Cognition drug effects, Female, Humans, Male, Methylphenidate administration & dosage, Methylphenidate adverse effects, Neuropsychological Tests, Osmosis, Prospective Studies, Psychiatric Status Rating Scales, Treatment Outcome, Atomoxetine Hydrochloride therapeutic use, Attention Deficit Disorder with Hyperactivity drug therapy, Executive Function drug effects, Methylphenidate therapeutic use
- Abstract
Objective: The aim of this study was to evaluate and compare the effects of atomoxetine (ATX) and osmotic release oral system-methylphenidate (OROS-MPH) therapies on executive functions, activities, treatment response time, and adverse effects based on discernible clinical effects in children with combined type attention-deficit/hyperactivity disorder (ADHD)., Methods: The study sample consisted of 43 children 7-12 years of age, who presented to the outpatient clinic with inattention, hyperactivity, and impulsivity for the first time, and were diagnosed as having combined type ADHD according to Diagnostic and Statistical Manual of Mental Disorders, 4th ed. (DSM-IV) criteria but had not previously used any medication for ADHD. The Wisconsin Card Sorting Test (WCST), Stroop Test TBAG Form (STP), and Visual Auditory Digit Span B (VADS B) were applied to all the patients included. Neuropsychological tests were repeated in 33 patients with good clinical recovery based on the Clinical Global Impressions-Improvement (CGI-I) scale (CGI-I ≤2) at the week in which clinical recovery was observed. The time limit for treatment response was set as 20 weeks., Results: It was found that there was significantly increased performance in executive functions with ATX and OROS-MPH in both groups. It was seen that although significantly increased performance was achieved in both perseveration and conceptual learning and reasoning domains by both agents, there was increased performance in more domains by the OROS-MPH group in WSCT. Mean doses were 1.31±0.37 mg/kg/day in the ATX group and 0.90±0.29 mg/kg/day in the OROS-MPH group. Comparable effectiveness (76.19% for ATX vs. 77.27% for OROS-MPH) and adverse effects (57.14% for ATX vs. 54.54% for OROS-MPH) were detected in both groups, whereas there was a significant difference in clinical response times between the groups (13 weeks for ATX vs. 7 weeks for OROS-MPH, p <0.001)., Conclusions: At the end of the study, it was seen that clinical recovery achieved by ATX and OROS-MPH therapy was associated with improved cognitive processes, and that these agents do not only lead to behavioral changes but also to an improvement in cognitive processes. In addition, improvements in cognitive processes occurred simultaneously with behavioral recovery. Behavior is the result of neurocognitive processes, and further studies on the domains that these drugs affect, or the way in which these agents exert their effects, are needed.
- Published
- 2015
- Full Text
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