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Öğe Evaluation of the therapeutic effects of calcium dobesilate in sciatic nerve crush injury in rats(Elsevier Sci Ltd, 2022) Akkaya, Suleyman; Ogden, Mustafa; Kartal, Bahar; Say, Bahar; Ceylan, Asli Fahriye; Akkaya, Merva Aydemir; Bakar, BulentIntroduction: Proinflammatory cytokines released from nerve endings and surrounding injured tissue af-ter nerve damage can prolong the inflammation process, delay nerve healing or result in poor quality nerve healing. In this case, due to the loss of function in the muscles innervated by the damaged nerve, the patient may have neurological and functional difficulties which may reduce the patient's quality of life and create an economic burden. Although the attempts of many pharmacological agents to heal crush injury of peripheral nerves have been recorded in literature, a drug that can provide adequate recovery of the crushed nerve and can be applied in daily life has not been defined as yet. This study aimed to assess the effects of calcium dobesilate on sciatic nerve crush injury in a rat model. Methods: A total of 26 male Wistar albino rats were separated into four groups as follows: CONTROL group (healthy subjects, n = 6); SHAM group (crush injury was created, n = 6); MP group (after created crush injury, methylprednisolone was administered, n = 7); and CAD group (after created crush injury, cal-cium dobesilate was administered, n = 7). A crush injury was created, then the electrophysiological find-ings and sciatic nerve functional index (SFI) were recorded before euthanasia. After the euthanasia of all the rats, samples of the crushed nerve and gastrocnemius muscle were evaluated histopathologically, immunohistochemically, and biochemically. Results: Both pharmacological agents were histopathologically effective in axon regeneration and repair. Calcium dobesilate did not preserve total muscle mass but was seen to prevent atrophy microscopically. Immunohistochemistry and biochemistry results showed that calcium dobesilate and methylprednisolone had anti-inflammatory, anti-oxidant, anti-apoptotic, and anti-autophagic activity in the crushed sciatic nerve. Neither calcium dobesilate nor methylprednisolone improved the nerve conductance level. SFI val-ues obtained on day 30 from the CAD group were numerically closer to the values of the healthy animals but not at a statistically significant level. Conclusion: The study results demonstrated that calcium dobesilate could suppress inflammatory pro-cesses and provide histopathological and functional improvements in the injured nerve in rats. Therefore, further clinical studies are recommended to investigate in detail the therapeutic effects of calcium dobe-silate on peripheral nerve crush injury. (c) 2022 Elsevier Ltd. All rights reserved.Öğe The Healing Effects of Thymoquinone and Dexpanthenol in Sciatic Nerve Compression Injury in Rats(Taylor & Francis Inc, 2019) Ogden, Mustafa; Karaca, Sahika Burcu; Aydin, Gulcin; Yuksel, Ulas; Dagli, Ahmet Turan; Akkaya, Suleyman; Bakar, BulentIntroduction: Functional healing of peripheral nerve injuries is still difficult. In this study, potential healing effects of thymoquinone and dexpanthenol in sciatic nerve compression injury (SCI) were investigated. Method: Twenty-four male Wistar albino rats which were applied compression injury to their sciatic nerves were randomly separated into four groups as following: "control" group contained six rats administered no pharmacological agent; "TMK" group consisted of six rats administered 10 mg/kg intraperitoneal thymoquinone once a day for one week; "DXP" group contained six rats administered 50 mg/kg intraperitoneal dexpanthenol once a day for one week; and "TMK-DXP" group consisted of six rats administered separately 10 mg/kg intraperitoneal thymoquinone and 50 mg/kg intraperitoneal dexpenthanol once a day for one week. Four weeks later from SCI, sciatic nerve function index (SFI) was applied before sacrifice of all rats, and then their crushed sciatic nerves were histopathologically examined, in terms of "Schwann cell count", "axon and myelin degeneration", "axon shape/size differences", "fibrosis", and "neovascularisation". Results: "Schwann cell count" (p = 0.011), "axon and myelin degeneration" (p = 0.001), "axon shape/size differences" (p = 0.011), and "fibrosis and neovascularisation" (p = 0.026) scores were different between the control and TMK-DXP groups. SFI scores were different between the control and TMK groups (p = 0.002), between the control and TMK-DXP groups (p < 0.001), and between the DXP and TMK-DXP groups (p = 0.029). Conclusions: This study results revealed that these pharmacological agents used alone had no histopathological healing effect in rats with SCI, but thymoquinone could improve walking function. However, thymoquinone and dexpanthenol used together had a significant histopathological and functional healing effect.Öğe Letter to the editor: "Cavernous sinus and abducens nerve in human fetuses near term"(SPRINGER FRANCE, 2020) Akkaya, Suleyman; Ozveren, Mehmet Faik[Özet Yok]Öğe Mature cystic teratoma mimicking meningomyelocele(Springer, 2021) Balci, Mahi; Yuksel, Ulas; Akkaya, Merva Aydemir; Akkaya, Suleyman; Sagsoz, NevinTeratomas are benign germ cell tumors originating from at least two germ layers, mostly of ectodermal and mesodermal origin. Mature teratomas are the most common subtype and develop from well-differentiated germ cells. Although the location is extragonadal in infants and young children, gonadal involvement occurs in adults. Midline defects can be diagnosed on prenatal imaging. In this case report, a newborn with mature cystic teratoma and a prenatal lumbar midline closure defect was presented. The perinatal preliminary diagnosis was meningomyelocele. However, a cystic sac containing exophytic solid tumoral tissues approximately 5 x 5 x 3 cm in size was seen macroscopically in the lumbar region after the birth, and this tumor was totally resected. After tumor excision, spina bifida aperta and vertebral exophytic bony tissue compatible with diastematomyelia were observed at the bottom of the surgical field and were totally resected. In the short-term follow-up, no additional problem occurred. The histopathological diagnosis was mature cystic teratoma. In conclusion, extragonadal teratoma accompanying diastematomyelia could easily be mistaken for meningomyelocele or other common malformations. Perinatal diagnosis should be provided using radiodiagnostic methods, and total surgical excision and accurate pathological diagnosis are essential to avoid the risk of recurrence.Öğe Possible predictive clinical and radiological markers in decision making for surgical intervention in patients with Chiari Malformation type 1(Taylor & Francis Ltd, 2022) Yuksel, Ulas; Burulday, Veysel; Akkaya, Suleyman; Baser, Selcuk; Ogden, Mustafa; Alhan, Aslihan; Bakar, BulentBackground The first aim of this study was to compare the clinical data and posterior fossa morphometry obtained during the admission to the hospital between control group individuals (who had not Chiari Malformation (CM) type 1) and CM type 1 patients treated surgically or not. The second aim was to create a valid and reliable scale that can predict the decision-making for surgical intervention simply and easily in these patients. Materials Medical data and radiological images of 70 CM type 1 patients during their admission to the hospital were compared with the data of 69 control group individuals. Results Conservative treatment and/or follow-up was applied to 58 (82.9%) patients, and 12 (17.1%) patients underwent surgery. ROC analysis showed that the presence of myelopathy, tonsillar herniation >8 mm, Chamberlain line >84 mm, McRae line >44.50 mm, and odontoid process-McRae line angle <10.50 degrees could be used as predictive markers in decision-making for surgical intervention (p < 0.05). Logistic Regression analysis revealed that symptoms severity, and McRae line value would be the 'best parameters' in decision-making for surgical intervention (p < 0.05). A scale named the CHIASURG scale developed using this study's parameters showed that the parameters of 'depth of tonsillar herniation', 'Chamberlain line', and 'McRae line' could predict the surgical intervention risk. Conclusion It was found that symptoms severity and McRae line value could be used as predictive markers in decision-making for surgical intervention. Additionally, it was concluded that a new scale called CHIASURG could predict surgical intervention risk validly and reliably.
