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Search Results: 1 - 10 of 70 matches for " Erdinc Civelek "
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A Case of Pituitary Hemorrhage Following Cardiopulmonary Bypass Surgery  [PDF]
Ozgen Ilgaz Kocyigit, Serdar Kabatas, Erdinc Civelek, Ezgi Tuncay, Oguz Omay, Tufan Cansever, Ayda Turkoz
Surgical Science (SS) , 2011, DOI: 10.4236/ss.2011.23034
Abstract: A 68-year-old female patient with previous history of transsphenoidal hypophysectomy operation underwent three-vessel coronary artery bypass graft (CABG) surgery for extensive coronary artery disease. Preoperative neurological examination revealed sequelae visual loss at right temporal visual field. Follow-up Magnetic Resonance Imaging studies showed a residual hypophyseal tumor tissue extending to suprasellar area. No additional pathology was detected in the early postoperative cranial control CT, but aggravation of visual field defect was determined. Coincidently, cranial magnetic resonance imaging (MRI) showed hemorrhage into the tumor tissue. We decided to follow-up the patient who exhibited no additional symptoms and was discharged well on the fifth day due to the signs of resolution of hemorrhage. Follow-up controls of the patient at sixth and twelfth months demonstrated normal hormone levels without any additional clinical complaints. We present preoperative assessment, perioperative anesthesia management, and postoperative clinical follow-up of a patient with a residual hypophyseal tumor.
Comparison of Histopathology of Transverse Carpal Ligament in Patients with Idiopathic Carpal Tunnel Syndrome and Hemodialysis Patients with Carpal Tunnel Syndrome  [PDF]
Erdinc Civelek, Tufan Cansever, Serdar Kabatas, Ebru Demiralay, Emre Demircay, Cem Comunoglu, Cem Yilmaz, Nur Alt?nors
Surgical Science (SS) , 2011, DOI: 10.4236/ss.2011.21003
Abstract: The aim of this paper is to point out the growing clinical importance of Carpal tunnel syndrome in patients on hemodialysis especially in aspect of the diagnosis, treatment and possible cause of the syndrome. Sixty patients with clinical diagnosis of Carpal Tunnel Syndrome was defined as the presence of two subjective symptoms (numbness, tingling in the median nerve distribution). The diagnosis was confirmed by electromyography. The patients with rheumatoid arthritis, thalasemia and thyroid dysfunction and the patients having pain due to arthritis or tenosynovitis were excluded. Fifty patients with clinical diagnosis of idiopathic CTS and seven hemodialysis patients having CTS were analyzed. Of 50 patients (47 female, 3 male) with clinical diagnosis of idiopathic CTS, 11 patients (22%) were involved bilaterally, 25 patients (50%) were affected only on the right and 14 patients (28%) were symptomatic only on the left. Of 7 hemodialysis patients (2 female, 5 male) with CTS, 1 patient (14%) was involved bilaterally (having two-sided A-V fistula), 4 patients (57%) were affected only on the right and 2 patients (28%) were symptomatic only on the left. There was significant correlation between the arteriovenous fistula and subsequent development of CTS. The all patients had fistulas in the affected side (5 of them were patent and 2 were occluded). In the relation between the duration of hemodialysis and development of CTS, 4 patients were over 10 years of hemodialysis, 2 patients were between 5 to 9 years and only 1 patient was below 4 years of duration. Amyloid deposit was demonstrated in 4 of 7 operated hands in the hemodialysis group. When we compared the presence of amyloid deposits in these groups, the difference between these two groups were found as statistically significant (p < 0.009). Although hemodialysis has no significant effect on development of fibrosis, the incidence of fibrosis was found as statistically significant in idiopathic carpal tunnel syndrome (p < 0.048). It is likely that there are numerous factors that may act either independently or in concert to potentiate the risk for developing CTS in patients on long-term hemodialysis.
Ganglion cyst of thoracolumbar region
Civelek Erdinc,Ozcan Ali,Onal Mehmet,Aydin Serkan
Neurology India , 2011,
Abstract:
A new method of patient′s head positioning in suboccipital retrosigmoid approach
Erdogan Ersin,Civelek Erdinc,Onal Mehmet,Solmaz Ilker
Neurology India , 2009,
Abstract: Background: The retrosigmoid approach is a common route to the cerebellopontine angle and lateral clivus. Patient′s head positioning just before the operation is crucial to perform the procedure effectively and safely. Aim : The aim of the study is to determine the positional angle of the head on preoperative axial sequences of the cranial magnetic resonance imaging (MRI). Materials and Methods : The angle between the line drawn along the petrous bone ventral to the internal auditory canal and the line drawn parallel to the dorsal face of the clivus on the axial view of MRI sequences was measured. Results : This method of patient positioning has resulted in minimal cerebellar retraction, less time in the preoperative preparation period and less postoperative headache and neck pain. Conclusions : This method can provide quick and better exposure of the cerebellopontine angle. Preoperative measurement of positional angle on axial MRI sequences is a very simple and sufficient way to determine the angle of the head that is turned to the contralateral side.
Analysis of proximal radial nerve injury in the arm
Duz Bulent,Solmaz Ilker,Civelek Erdinc,Onal M
Neurology India , 2010,
Abstract: Background: Radial nerve is the most frequently injured major nerve in the upper extremity. Proximal part of the radial nerve involvement can result from a humerus fracture, direct nerve trauma, compression and rarely from tumors. Objectives: The aim of the study is to determine the clinical characteristics and electrodiagnostic findings in patients with proximal radial nerve injuries, and also the outcome of surgical treatment. Materials and Methods: The study subjects included 46 patients with radial nerve injuries seen between June 2000 and June 2008 at our hospital. The analysis included demographics, clinical features, etiology, pre-and postoperative EMNG (Electromyoneurography) findings. Results: Surgical decompression resulted in neurological improvement in patients with radial entrapment neuropathies. Good neurological recovery was observed from decompression of callus of old humeral fracture. The worst results were observed in the direct missile injuries of the radial nerve. Conclusions: A detailed clinical and electrodiagnostic evaluation is of importance in patients with radial nerve injury to ensure an appropriate treatment. The choice of treatment, conservative or surgical, depends on the clinical presentation and the type of injury.
Australia Online; Borderless University
Zeynep ERDINC
The Turkish Online Journal of Distance Education , 2002,
Abstract:
RobCoP: A Matlab Package for Robust CoPlot Analysis  [PDF]
Yasemin Kayhan Atilgan, Erdinc Levent Atilgan
Open Journal of Statistics (OJS) , 2017, DOI: 10.4236/ojs.2017.71003
Abstract: The graphical representation method, Robust CoPlot, is a robust variant of the classical CoPlot method. CoPlot is an adaptation of multidimensional scaling (MDS), and is a practical tool for visual inspection and rich interpretation of multivariate data. CoPlot enables presentation of a multidimensional dataset in a two dimensions, in a manner that relations between both variables and observations to be analyzed together. It has also been used as a supplemental tool to cluster analysis, data envelopment analysis (DEA) and outlier detection methods in the literature. However, this method is very sensitive to outliers. When a multidimensional dataset contains outliers, this can lead to undesirable consequences such as the inaccurate representation of the variables. The motivation is to produce Robust CoPlot that is not unduly affected by outliers. In this study, we have presented a new MATLAB package RobCoP for generating robust graphical representation of a multidimensional dataset. This study serves a useful purpose for researchers studying the implementation of Robust CoPlot method by providing a description of the software package RobCoP; it also offers some limited information on the Robust CoPlot analysis itself. The package presented here has enough flexibility to allow a user to select an MDS type and vector correlation method to produce either classical or Robust CoPlot results.
FPGA Implementable Frame Synchronization Algorithm for Burst Mode GMSK  [PDF]
Onur Berkay Gamgam, Erdinc Levent Atilgan
Communications and Network (CN) , 2017, DOI: 10.4236/cn.2017.91005
Abstract: In time division multiple access (TDMA) communication systems, correctly estimating the synchronization parameters is very important for reliable data transfer. The algorithms used for frequency/phase and symbol timing estimates are generally accepted as knowing the start of signal (SoS) parameter. Therefore, within these parameters, the SoS parameter is of particularly great importance. In this study, a reduced version of the SoS estimation algorithm introduced by Hosseini and Perrins is presented to estimate SoS for Gaussian Minimum Shift Keying (GMSK) modulated signals in burst format over additive white Gaussian noise (AWGN) channels. The reduced algorithm can be implemented on FPGA by using half the number of complex multipliers that would be required by the double correlation method and is robust to carrier frequency/phase errors. Simulations performed under 0.1 normalized frequency offset conditions show that the proposed algorithm has a probability of false lock which is less than 7×10-2, even at 0 dB SNR level.
Mass-radius relations for helium white dwarfs
R. Civelek,N. Kiziloglu
Physics , 1998,
Abstract: In recent years, white dwarf stars are receiving increasing attension. The recent studies on the relation of M-R for the WDs are those of Wood (1990), Vennes et al. (1995) and Althaus and Benvenuto (1997, 1998). Vennes et al. (1995) computed static M-R relation for masses between 0.4 $M_\odot$ and 0.7 $M_\odot$ assuming non zero temperature effects. They assumed the luminosity is proportional to the mass which works for cool WDs but their results are in the range of high effective temperatures. As Althaus and Benvenuto (1997) mentioned, luminosity is not proportional to a constant for hot WD interiors because of neutrino emission. The purpose of this study is to present the effect of neutrino emission at finite temperatures. We considered fully degenerate configuration for WDs with pure helium composition to obtain static mass-radius relation for masses greater than 0.4 $M_\odot$ with luminosity mass ratio due to neutrino energy loss.
Perfluorodecaline residue in the anterior chamber of a patient with an intact crystalline lens: a case report
Erdinc Aydin, Helin Demir
Journal of Medical Case Reports , 2008, DOI: 10.1186/1752-1947-2-13
Abstract: Perfluorodecaline was used as a temporary retinal tamponade. Three weeks after the surgery, a residue of heavy liquid was observed in the anterior chamber, even though the patient had an intact crystalline lens without any tilt or dislocation. The remnant of the heavy liquid was taken out of the anterior chamber immediately to avoid secondary complications.Presence of heavy liquids in the anterior chamber may be associated with zonular defects even though the patient has an intact crystalline lens.Perfluorocarbon liquids (PFCLs) with high specific gravity relative to aqueous or subretinal fluid have been frequently used as intraoperative tools and a short-term tamponade in vitreoretinal surgery [1]. It is usually removed at the end of the procedure; however, occasionally residue may be retained due to hazy media. Some clinical reports have been presented in the literature about remnants of perfluorodecaline in the anterior segment [2,3].We report a case of a patient with perfluorodecaline in the anterior chamber who had an intact crystalline lens following pars plana vitrectomy.A 17-year-old male with progressive visual loss and photopsia was admitted to our ophthalmology clinic. He had a history of blunt trauma with a basketball to his right eye 6 months ago and had begun to suffer from visual disturbances since then. His visual acuity (VA) was 20/400 in his right eye. Dilated fundus exam of his right eye revealed a giant tear in the superotemporal retina with a shallow retinal detachment involving the macula (Figure 1a and 1b). His visual acuity was 20/20 and anterior and posterior segments were normal in the left eye. He underwent a three-port pars plana vitrectomy for the giant tear without crystalline lens extraction. Perfluorodecaline was used intraoperatively. Three weeks postoperatively, perfluorodecaline was observed in the anterior chamber in contact with the corneal endothelium (Figure 2). No tilt or dislocation of the crystalline lens was detected on sli
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