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Search Results: 1 - 10 of 437 matches for " Tolga Atay "
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Effects of 1800 MHz Electromagnetic Field Emitted from Cellular Phones on Bone Tissue
Tolga ATAY
Trakya Universitesi Tip Fakultesi Dergisi , 2009,
Abstract: Objectives: An electromagnetic field (EMF) has biological effects on the behavior of the cell populations. The purpose of this study was to investigate the effects of 1800 MHz EMF which is similar to the cellular phones on the bone mineral density (BMD) of rat bone tissue.Materials and Methods: A total of 30 male rats were divided into two groups as EMF and controls. EMF with 1±04 mW/cm2 power and 1800 MHz frequency has been applied on rats for four weeks, five days per week and 30 minutes each day. Control group was held in the same environmental conditions for the same time except EMF application. At the end, BMD of all rats was measured by scanning with Dual Energy X-ray Absorptiometry.Results: Although a small increase in lumbar BMD and a decrease in BMD of the femur was determined in the group affected by 1800 MHz EMF, a significant difference was not found (p>0.05).Conclusion: Our results suggest that high frequency EMF has no effect on bone tissue with regard to osteoporosis. As serious diseases like cancer has been speculated as an outcome of exposure to frequencies used in mobile phones, further studies are warranted to reveal its effects on human health.
The Effects of Related Factors on One- and Two-Year Mortality after a Hip Fracture in Elderly Turkish Patients
Tolga ATAY
Trakya Universitesi Tip Fakultesi Dergisi , 2010,
Abstract: Objectives: Hip fractures are one of the most serious causes of impairment and death in the elderly. The aim of this study is to identify the effects of different risk factors on mortality after a hip fracture in elderly Turkish patients.Patients and Methods: Two-hundred forty patients (>60 years; mean age 76.0±8.2 years) who were operated for fracture of the hip from 2001 to 2006 were investigated. Demographic data, preoperative length of hospital stay, anesthesia type and ASA physical status, albumin level at admission and comorbidities were recorded.Results: Mean albumin level was 3.45±0.62 g/dl. Onehundred eight (45%) had hypoalbuminemia. The difference between mortality rates of normo- and hypoalbuminemic patients were not significant at one and two-year. According to preoperative length of stay; one-year mortality was significantly higher in male patients (p=0.015) while two-year mortality was not. One-year mortality was related with high ASA physical status scores (p=0.002) while two-year mortality was not (p=0.169). According to gender; one-year mortality was found higher in men (p=0.001).Conclusion: Due to comorbidities, high ASA scores are common in elderly patients. Since the preoperative evaluation in high ASA physical status is longer, this may prolong the preoperative hospital stay. Delay after admission and high ASA physical status are important predictors of mortality for elderly hip fracture patients.
The Efficacy of Intra-Articular Injection of Hyaluronic Acid With Supplemental Peroral Vitamin E Following Arthroscopic Debridement in the Treatment of Knee Osteoarthritis: A Prospective, Randomized, Controlled Study
Ahmet Aslan,Vecihi K?rdemir,Tolga Atay,Yakup Barbaros Baykal
Türkiye Fiziksel Tip ve Rehabilitasyon Dergisi , 2012,
Abstract: Objective: We evaluated clinical results of intra-articular injection of hyaluronic acid and peroral Vitamin E treatment after arthroscopic debridement in patients with knee osteoarthritis who got no cure with medical treatment previously. Materials and Methods: A total of 44 patients with knee pain, who were diagnosed as having knee osteoarthritis according to the American College of Rheumatology criteria, were included in this study. The subjects were randomly divided into 3 groups after arthroscopic debridement: Group S was given intra-articular Hylan G-F 20 treatment; Group S+E - intraarticular Hylan G-F 20 treatment plus oral vitamin E; and Group C underwent only arthroscopic debridement. Pain, stiffness and functional capacity scores were evaluated preoperatively and 6 and 12 months postoperatively according to the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC). Results: In all groups, 6- and 12-month postoperative WOMAC scores were lesser than the preoperative ones. The WOMAC scores at 6 and 12 months were statistically lower in the S+E and S groups than in the group C (p<0.05). The S+E group demonstrated better results in terms of improvement in symptoms than the S-group at 6 and 12 months postoperatively (p<0.05). Conclusion: We believe that arthroscopic debridement is beneficial in suitable knee osteoarthritis cases and vitamin E and intra-articular hyaluronic acid may reduce the symptoms of knee osteoarthritis. Turk J Phys Med Re-hab 2012;58:199-203.
Brucellar Prosthetic Infection After Total Knee Arthroplasty: A Case With Retained Prosthesis by Arthroscopic and Medical Treatment
Tolga ATAY,Metin Lütfi BAYDAR,Nurettin HEYBEL?,Vecihi KIRDEM?R
Trakya Universitesi Tip Fakultesi Dergisi , 2008,
Abstract: Infection after total knee arthroplasty is a severe complication and is associated with high morbidity. We describe a case of a brucellosis infection of the knee joint, four years after cemented total knee prosthesis application. Treatment strategies of antimicrobial chemotherapy with or without initial excisional arthroplasty are recommended in the literature. After diagnostic arthroscopy and wash-out with synovectomy, we initiated doxycycline and rifampicin combination therapy without an initial excisional arthroplasty, in this case. This treatment strategy can be another option before performing a major surgery which may affect the patient's quality of life
The effects of electromagnetic field exposure at short and long term of 900 mhz frequency emitted from mobile phones on rat bone tissue
Ahmet Aslan,Nevres Hürriyet Aydo?an,Tolga Atay,Sel?uk ??mlek?i
Dicle Medical Journal , 2011,
Abstract: Objectives: There are increasing number of evidence that exposure to the radiofrequency fields from mobile phones could affect human health. An electromagnetic field (EMF) has some biological effects on the behavior of the cell population of bone. The aim of this study was to investigate the effects of 900 MHz EMF emitted by mobile phones on the bone mineral density (BMD) of rat bone tissue.Materials and methods: This study was done in Süleyman Demirel University, Turkey in 2006 . A total of 30 male rats were divided in three groups. EMF with 1±04 mW/cm2 power and 900 MHz frequency: Group I (n=10) was exposed to short term (ST) 900 MHz EMF for 30 min/day, f ve day per week during 4 weeks, group II (n=10) was exposed to long term (LT) 900 MHz EMF for 30 min/day f ve day per week during 8 weeks and group III (n=10) was non-irradiated as control group and was held in the same environmental conditions for the same time except EMF application. At the end of the experiment, BMD of all rats was measured by scanning with Dual Energy X-ray Absorptiometry.Results: Both lumbar spine and femur diaphysis BMD values were found to be lower in the exposed to ST or LT 900 MHz groups compared with the control group. However, the differences did not reach to a significant level (P>0.05).Conclusions: It can be said that exposure to ST or LT 900 MHz EMF acquired from cellular phones and/or similar sources with an average power intensity of 1.04 mW/cm2 and a SAR value of 0.008 W/kg has not significant effects on rats bone tissue BMD
Acute Serious Thrombocytopenia Associated with Intracoronary Tirofiban Use for Primary Angioplasty
Mustafa Yurtda?,Yalin Tolga Yaylali,Nesim Alada?,Mahmut ?zdemir,Memi? Hilmi Atay
Case Reports in Medicine , 2014, DOI: 10.1155/2014/190149
Abstract: Tirofiban, a specific glycoprotein IIb/IIIa inhibitor, may cause extensive thrombocytopenia with an incidence of 0.2% to 0.5%. We report the case of a 50-year-old man who developed thrombocytopenia after tirofiban use (both intracoronary and peripheral) over hours and the successful management of this complication after primary percutaneous coronary intervention for acute ST-segment elevation myocardial infarction. 1. Introduction Glycoprotein IIb/IIIa inhibitors (GPIs) are commonly employed in treating patients who have unstable angina, non-ST, and ST-segment elevation myocardial infarction (STEMI), as well as in combination with angioplasty with or without stent placement [1]. Tirofiban, a specific and nonpeptide GPI, competitively inhibits the platelet fibrinogen receptor and may lead to severe thrombocytopenia with an incidence of 0.2% to 0.5% [2]. In this report, we describe a case of acute serious thrombocytopenia after 4?h of tirofiban administration in a patient in whom primary percutaneous coronary intervention (PCI) was performed for acute anterior STEMI. 2. Case Report A 50-year-old man presented with an acute anterior STEMI. Initial laboratory tests showed a normal complete blood count (CBC) including platelet count (265 109/L) at the emergency department. He reports no history of bleeding disorders, hematologic and renal problems, or heparin exposure. He immediately underwent PCI after pretreatment with 300?mg of aspirin and 600?mg of clopidogrel and 10.000?IU of intravenous unfractionated heparin. Coronary angiography showed the totally occluded left anterior descending artery (LAD). After predilatation, a large and fresh thrombus was seen. We first administered tirofiban via intracoronary route at a dose of 10?μg/kg followed by peripheral intravenous infusion at 0.15?μg/kg/min and then implanted a coronary 4.5 18?mm bare metal stent into LAD. A combination therapy of aspirin, clopidogrel, enoxaparin, and tirofiban infusion was given to the patient. Approximately 4?h after the PCI, areas of petechiae and ecchymoses were observed around the sternum and on both legs. The patient's platelet count was detected to be 5 109/L (Table 1). Checkup on the peripheral smear of a blood sample validated the extensive lack of platelets with no clustering. All antiplatelet drugs including tirofiban were immediately discontinued, and the patient was treated with Ig G infusion in order to achieve a quick recovery. There was a very slight rise on day 1, with improvement beginning after day 2 and counts surpassing 100 109/L on day 4 (Table 1). During this
Surgical Treatment of Osteopetrosis-Related Femoral Fractures: Two Case Reports and Literature Review
Ahmet Aslan,Yakup Barbaros Baykal,Emin Uysal,Tolga Atay,Vecihi Kirdemir,Metin Lütfi Baydar,Nevres Hürriyet Aydo?an
Case Reports in Orthopedics , 2014, DOI: 10.1155/2014/891963
Abstract: Osteopetrosis is a rare hereditary disease which is characterized by increased bone density. Bone resorption is insufficient or fails due to the osteoclast defect in osteopetrosis. Half of the patients are asymptomatic and diagnosed incidentally or based on the presence of fracture. Adult onset osteopetrosis usually presents with hip and proximal femoral fractures. Internal fixation can be performed; however, technical challenges may be experienced due to increased bone density. As in other fractures, nonunion or varus malunion of these fractures may occur. Although rare, osteopetrosis may complicate treatment of fractures in such patients. In this study, we aimed to present two new cases of ADO type II with an osteopetrotic femoral fracture along with the clinical and radiological findings in the light of a comprehensive literature review. Orthopaedics surgeons should be aware of intraoperative technical difficulties and possible postoperative complications during the follow-up period. Investigation would be beneficial for the diagnosis of osteopetrosis such the patient with fractures who has minor trauma history and increased bone density in radiography. 1. Introduction Osteopetrosis is a rare hereditary disease which is characterized by increased bone density [1–3]. Bone resorption is insufficient or fails due to the osteoclast defect in osteopetrosis. The disease usually presents with increased bone mass and generalized osteosclerosis [1, 4–9]. It has three clinical forms based on the age of onset, inheritance pattern, and clinical features: (i) infantile or malignant osteopetrosis, (ii) intermediate, and (iii) adult onset or benign osteopetrosis [1, 4, 5, 10–12]. Adult benign autosomal dominant osteopetrosis has two distinct phenotypic variants [1, 6–8]. Osteopetrosis tarda, which is also known as marble bone disease, is a subtype of autosomal dominant osteopetrosis type II (ADO type II) [1, 4, 5, 9]. It is characterized by clinically minor trauma-related fractures and typical radiographic findings of failure of tubulation and a “bone within a bone” appearance. Half of the patients are asymptomatic and diagnosed incidentally or based on the presence of fracture. Adult onset osteopetrosis usually presents with hip and proximal femoral fractures [3, 10]. Internal fixation can be performed; however, technical challenges may be experienced due to increased bone density. As in other fractures, nonunion or varus malunion of these fractures may occur. Although rare, osteopetrosis may complicate treatment of fractures in such patients. There are usually as
Analysis of the Invariance and Generalizability of Multiple Linear Regression Model Results Obtained from Maslach Burnout Scale through Jackknife Method  [PDF]
Tolga Zaman, Kamil Alakus
Open Journal of Statistics (OJS) , 2015, DOI: 10.4236/ojs.2015.57065
Abstract:

The purpose of this study was to examine the burnout levels of research assistants in Ondokuz Mayis University and to examine the results of multiple linear regression model based on the results obtained from Maslach Burnout Scale with Jackknife Method in terms of validity and generalizability. To do this, a questionnaire was given to 11 research assistants working at Ondokuz Mayis University and the burnout scores of this questionnaire were taken as the dependent variable of the multiple linear regression model. The variable of burnout was explained with the variables of age, weekly hours of classes taught, monthly average credit card debt, numbers of published articles and reports, gender, marital status, number of children and the departments of the research assistants. Dummy variables were assigned to the variables of gender, marital status, number of children and the departments of the research assistants and thus, they were made quantitative. The significance of the model as a result of multiple linear regressions was examined through backward elimination method. After this, for the five explanatory variables which influenced the variable of burnout, standardized model coefficients and coefficients of determination, and 95% confidence intervals of these values were estimated through Jackknife Method and the generalizability of the parameter estimation results of these variables on population was researched.

New Generation Marketing On Social Media And A Research On Usage Of Social Networks In
Tolga Kara
Global Media Journal : Turkish Edition , 2012,
Abstract: In today’s world where technological progresses are quickly changing our lives, firms have to reshape themselves according to this new understanding. Classical business models that focus on producer are replaced by consumer centric new business ideas. Firms which are far away from needs and expectations of consumer will lose their market position and disappear over time. This view shows itself in new communication channels and social media networks offer incredible possibilities for firms. In our study, conceptual basics of social media networks are covered and approached from the new marketing point of view. After that, firms in Turkish Communication and Information Technologies Industry examined in respect of their social media networks usage and results have been evaluated.
Development of Problem Solving Confidence Questionnaire: Study of Validation and Reliability [PDF]
Tolga Gok
Latin-American Journal of Physics Education , 2012,
Abstract: This study aimed to develop and validate a problem solving confidence questionnaire which would help teachers, instructors, and researchers to have better understanding of problem solving confidence of students. The participants of this scale were 950 undergraduate science and engineering students enrolled in the Introductory Calculus Based Physics. The development of the scale included the following three steps; item formulation, content validation and reliability calculation. The scale has 20 items allocated to two factors: (1) High Confidence; (2) Low Confidence. The scale items had a factor loading of at least .40. The results of the factor analysis revealed that the scale accounted for the 57.32% of the total variance. The alpha reliability coefficient was .92. According to these findings, the Problem Solving Confidence Questionnaire (PSCQ) is a valid and reliable instrument that can be used in the field of engineering and science education.
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