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Ocal F Ceyda Akin,Kavus Haluk,Satar Bulent,Pehli̇van Davut 대한청각학회 2022 Journal of Audiology & Otology Vol.26 No.2
The purpose of this study was to evaluate the clinical and genetic findings of 53-year-old monozygotic twins who had bilateral otosclerosis and right-sided superior semicircular canal near dehiscence (SSCND). Monozygotic twins at the age of 53 presented with conductive hearing loss and normal tympanic membranes. Detailed audiovestibular testing and computed tomography scan revealed that both patients had concurrent otosclerosis and SSCND. Conservative management (hearing aids) was the treatment for these patients. Exome sequencing (ES) for the twins and their affected mother identified a heterozygous missense variant in the EYA4 (c.1744G>A; p.Glu582Lys) gene. This is the first case report to present these separate entities identified in monozygotic twins with a heterozygous missense variant in the EYA4 gene. Our ES data may imply a possible causal relationship or association between variants in the EYA4 gene and concurrent otosclerosis and SSCND.
Ocal, Irfan,Avci, Arzu,Cakalagaoglu, Fulya,Can, Huseyin Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.4
Background: In this study prognostic correlations of histopathologic parameters and the Ki-67 proliferation index and as well as the diagnostic value of immunohistochemical markers in pheochromocytomas were evaluated. Materials and Methods: A total of 22 patients diagnosed with a pheochromocytoma between 2000-2010 in Izmir Katip Celebi University Ataturk Training and Research Hospital were included. Diagnostic value of the PASS scoring system, and prognostic correlations of histopathologic parameters and Ki-67 proliferation index were investigated. SPSS for Windows 17.0 software was used for statistical analysis. Results: There was no statistically significant correlation between recurrence and clinicopathologic parameters or the PASS score (PASS>4). In addition, there were no statistically significant correlations between PASS score and clinicopathologic parameters, such as diameter (5 cm), weight (>100g), gender (female/male ratio) and age (25-45/45-55/>55). Besides, there were no significant correlation between diameter and clinicopathological parameters and also recurrence. However, there was a statistically significant correlation between Ki-67 proliferation index and capsule invasion (p=0.047). Conclusions: Some but not most of the findings in our study were concordant with the literature. To clarify relationships, investigations with standard scoring systems which are not affected by subjective factors and feature appropriate histopathological criteria should be made on larger study groups.
Ocal F Ceyda Akin,Karacayli Ceren,Coban Volkan Kenan,Satar Bulent 대한청각학회 2021 Journal of Audiology & Otology Vol.25 No.2
Background and Objectives: The aim of the study was to compare effects of tone-burst (TB) and narrow-band (NB) Claus Elberling (CE)-chirp stimuli on amplitude, latency and interaural asymmetry ratio (IAR) of cervical vestibular evoked myogenic potentials (cVEMP) in healthy individuals.Subjects and Methods: The study included 50 healthy volunteers. cVEMP procedure was carried out using 500 Hz TB and NB-CE-chirp stimulus (360-720 Hz, up-chirp) in random order. cVEMP were recorded at 100 dB nHL. For each ear and each stimulus, P1 latency, N1 latency and P1N1 amplitude were measured. IAR was also calculated.Results: Mean age was 26.66±9.48 years. cVEMP’s in response to both TB and NB CE-chirp stimuli were obtained in all subjects. No statistically significant difference in P1 latency, N1 latency, and P1N1 amplitude was found between the right and left ears for both TB and NB CE-chirp stimuli (<i>p</i>>0.05). In both sides, P1 and N1 latencies were significantly shorter in NB CE-chirp stimulation compared to TB stimulation (<i>p</i>=0.000). In both sides, no statistically significant difference was found in P1N1 amplitude between two types of stimuli (<i>p</i>>0.05).Conclusions: The chirp stimulus produces robust but earlier cVEMP than TB does. This largest series study on NB chirp cVEMP shows that NB chirp is a good and new reliable alternative.
Omur Ocal,Atilla Bir 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Coefficient Diagram Method (CDM) is one of the most important controller design method used in control engineering. It is now successfully and commonly used. By applying CDM, it is possible to obtain systems which are stable and robust with relative small settling time without overshoot. All these capabilities of the system are regulated by changing some adjusted parameters in CDM according to design targets. A Model Reference Adaptive System (MRAS) is an adaptive system that changes the control parameters according to a certain system model. The control system follows the model system output. If stable model systems (with poles far away from the origin of s-domain axes) are chosen, good system responses are obtained. Although, the investigated control and system output signals may have some undesired overshoots; it is still possible that the output system can follow the output signal of the model reference system. In this paper, we describe a new hybrid controller that consists of a combination of the MRAS and CDM. This hybrid structure is called an MRAS-CDM controller. First, the CDM and then MRAS-CDM structure are briefly introduced and then as a real-time application a process control application investigated. The benefits of the MRAS-CDM are obvious. It is shown that the system outputs which are obtained with MRAS-CDM are much better for the poles near the origin as well as for the poles which are far away in the negative s-plane.
Giant solitary pancreatic stone in a chronic pancreatitis patient
Osman Cagin Buldukoglu,Serkan Ocal,Tugrul Cakir,Ahmet Sukru Alparslan,Ayhan Hilmi Cekin 소화기인터벤션의학회 2023 International journal of gastrointestinal interven Vol.12 No.3
Chronic pancreatitis (CP) is a chronic, progressive, inflammatory disease of the pancreas. Pancreatolithiasis is a complication of CP. In this case report, we present a patient with a giant solitary pancreatic stone that necessitated surgery. A 34-year-old patient with CP presented to our outpatient clinic with abdominal pain. Computed tomography revealed near-total atrophy of the pancreatic parenchyma and an 85-mm-long stone within the main pancreatic duct. Due to abdominal pain refractory to medical treatment and the long-term malignancy risk in the near-totally atrophic pancreas, the decision was made to perform surgery based on a multidisciplinary team meeting. Total pancreatectomy was carried out and a 30 × 85 mm pancreatic stone filling the main pancreatic duct was found in the specimen. Intractable pain, local complications of adjacent organs, and suspicion of a malignant lesion are indications for surgery in patients with CP. A case-based clinical approach is necessary for the management of pancreatic stones.
Effects of Tumor Necrosis Factor Alpha Blocker Adalimumab in Experimental Spinal Cord Injury
Borcek, Alp Ozgun,Civi, Soner,Ocal, Ozgur,Gulbahar, Ozlem The Korean Neurosurgical Society 2015 Journal of Korean neurosurgical society Vol.57 No.2
Objective : Tumor necrosis factor alpha (TNF-${\alpha}$) have proven effects in pathogenesis of neuroinflammation after spinal cord injury (SCI). Current study is designed to evaluate the effects of an anti-TNF-${\alpha}$ agent, adalimumab, on spinal cord clip compression injury in rats. Methods : Thirty two male adult Wistar rats were divided into four groups (sham, trauma, infliximab, and adalimumab groups) and SCI was introduced using an aneurysm clip. Animals in treatment groups received 5 mg/kg subcutaneous adalimumab and infliximab right after the trauma. Malondialdehyde (MDA) levels were studied in traumatized spinal cord tissues 72 hours after the injury as a marker of lipid peroxidation. Results : Animals that received anti-TNF-${\alpha}$ agents are found to have significantly decreased MDA levels. MDA levels were significantly different between the trauma and infliximab groups (p<0.01) and trauma and adalimumab groups (p=0.022). There was no significant difference in neurological evaluation of the rats using Tarlov scale. Conclusion : These results suggest that, like infliximab, adalimumab has favorable effects on lipid peroxidation induced by spinal cord trauma in rats.