103 results on '"Karadag, C"'
Search Results
2. Defining activities in neurovascular microsurgery training: entrustable professional activities for vascular neurosurgery.
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Lieshout, J.H. van, Malzkorn, B., Steiger, H.J., Karadag, C., Kamp, Marcel A., Vajkoczy, P., Beck, J., Peschillo, S., Rohde, V., Walsh, D., Lukshin, V., Korja, M., Cenzato, M., Raabe, A., Gruber, A., Hänggi, D., Boogaarts, H.D., Lieshout, J.H. van, Malzkorn, B., Steiger, H.J., Karadag, C., Kamp, Marcel A., Vajkoczy, P., Beck, J., Peschillo, S., Rohde, V., Walsh, D., Lukshin, V., Korja, M., Cenzato, M., Raabe, A., Gruber, A., Hänggi, D., and Boogaarts, H.D.
- Abstract
01 januari 2023, Item does not contain fulltext, BACKGROUND: Entrustable professional activities (EPAs) represent an assessment framework with an increased focus on competency-based assessment. Originally developed and adopted for undergraduate medical education, concerns over resident ability to practice effectively after graduation have led to its implementation in residency training but yet not in vascular neurosurgery. Subjective assessment of resident or fellow performance can be problematic, and thus, we aim to define core EPAs for neurosurgical vascular training. METHODS: We used a nominal group technique in a multistep interaction between a team of experienced neurovascular specialists and a medical educator to identify relevant EPAs. Panel members provided feedback on the EPAs until they reached consent. RESULTS: The process produced seven core procedural EPAs for vascular residency and fellowship training, non-complex aneurysm surgery, complex aneurysm surgery, bypass surgery, arteriovenous malformation resection, spinal dural fistula surgery, perioperative management, and clinical decision-making. CONCLUSION: These seven EPAs for vascular neurosurgical training may support and guide the neurosurgical society in the development and implementation of EPAs as an evaluation tool and incorporate entrustment decisions in their training programs.
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- 2023
3. Initial Temporal Muscle Thickness and Area: Poor Predictors of Neurological Outcome in Aneurysmal Subarachnoid Hemorrhage in a Central European Patient Cohort
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Karadag, C., Kamp, Marcel A., Fischer, I., Boogaarts, H.D., Beseoglu, K., Muhammad, S., Cornelius, J.F., Hofmann, Bjoern B., Karadag, C., Kamp, Marcel A., Fischer, I., Boogaarts, H.D., Beseoglu, K., Muhammad, S., Cornelius, J.F., and Hofmann, Bjoern B.
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Item does not contain fulltext
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- 2023
4. Novel Insights into Pathophysiology of Delayed Cerebral Ischemia: Effects of Current Rescue Therapy on Microvascular Perfusion Heterogeneity
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Hofmann, Bjoern B., Karadag, C., Rubbert, Christian, Schieferdecker, Simon, Neyazi, Milad, Abusabha, Yousef, Boogaarts, H.D., Kamp, Marcel A., Cornelius, J.F., Hofmann, Bjoern B., Karadag, C., Rubbert, Christian, Schieferdecker, Simon, Neyazi, Milad, Abusabha, Yousef, Boogaarts, H.D., Kamp, Marcel A., and Cornelius, J.F.
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Item does not contain fulltext
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- 2023
5. Lack of effect of ceftriaxone, a GLT-1 transporter activator, on spatial memory in mice
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Karaman, Ipek, Kizilay-Ozfidan, Gulnur, Karadag, C. Hakan, and Ulugol, Ahmet
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- 2013
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6. EBI following aneurysmal SAH results in a homogeneous perfusion impairment in early CT perfusion imaging
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Hofmann, BB, Fischer, I, Donaldson, DM, Karadag, C, Beseoglu, K, van Lieshout, JH, Muhammad, S, Turowski, B, Hänggi, D, Rubbert, C, Kamp, MA, Hofmann, BB, Fischer, I, Donaldson, DM, Karadag, C, Beseoglu, K, van Lieshout, JH, Muhammad, S, Turowski, B, Hänggi, D, Rubbert, C, and Kamp, MA
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- 2022
7. Development and Internal Validation of the ARISE Prediction Models for Rebleeding After Aneurysmal Subarachnoid Hemorrhage
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Lieshout, J.H. van, Mijderwijk, H.J., Nieboer, D., Lingsma, H.F., Ahmadi, S.A., Karadag, C., Muhammad, S., Porčnik, A., Wasilewski, D., Wessels, L., Donkelaar, C.E. van, Dijk, J.M.C. van, Hänggi, D., Boogaarts, H.D., Lieshout, J.H. van, Mijderwijk, H.J., Nieboer, D., Lingsma, H.F., Ahmadi, S.A., Karadag, C., Muhammad, S., Porčnik, A., Wasilewski, D., Wessels, L., Donkelaar, C.E. van, Dijk, J.M.C. van, Hänggi, D., and Boogaarts, H.D.
- Abstract
Item does not contain fulltext, BACKGROUND: Aneurysmal rerupture is one of the most important determents for outcome after aneurysmal subarachnoid hemorrhage and still occurs frequently because individual risk assessment is challenging given the heterogeneity in patient characteristics and aneurysm morphology. OBJECTIVE: To develop and internally validate a practical prediction model to estimate the risk of aneurysmal rerupture before aneurysm closure. METHODS: We designed a multinational cohort study of 2 prospective hospital registries and 3 retrospective observational studies to predict the risk of computed tomography confirmed rebleeding within 24 and 72 hours after ictus. We assessed predictors with Cox proportional hazard regression analysis. RESULTS: Rerupture occurred in 269 of 2075 patients. The cumulative incidence equaled 7% and 11% at 24 and 72 hours, respectively. Our base model included hypertension, World Federation of Neurosurgical Societies scale, Fisher grade, aneurysm size, and cerebrospinal fluid drainage before aneurysm closure and showed good discrimination with an optimism corrected c-statistic of 0.77. When we extend the base model with aneurysm irregularity, the optimism-corrected c-statistic increased to 0.79. CONCLUSION: Our prediction models reliably estimate the risk of aneurysm rerupture after aneurysmal subarachnoid hemorrhage using predictor variables available upon hospital admission. An online prognostic calculator is accessible at https://www.evidencio.com/models/show/2626 .
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- 2022
8. Non-adjustable gravitational valves or adjustable valves in the treatment of hydrocephalus after aneurysmal subarachnoid hemorrhage patients?
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Arts, S.H.H.M.J., Lieshout, J.H. van, Bilsen, M.W. van, Karadag, C., Beez, T., Abbeele, L. van den, Aquarius, R.J., Vinke, R.S., Bartels, R.H.M.A., Lindert, E.J. van, Hänggi, D., Boogaarts, H.D., Arts, S.H.H.M.J., Lieshout, J.H. van, Bilsen, M.W. van, Karadag, C., Beez, T., Abbeele, L. van den, Aquarius, R.J., Vinke, R.S., Bartels, R.H.M.A., Lindert, E.J. van, Hänggi, D., and Boogaarts, H.D.
- Abstract
Contains fulltext : 286922.pdf (Publisher’s version ) (Open Access), PURPOSE: Hydrocephalus requiring permanent CSF shunting after aneurysmal subarachnoid hemorrhage (aSAH) is frequent. It is unknown which type of valve is optimal. This study evaluates if the revision rate of gravitational differential pressure valves (G-DPVs, GAV® system (B Braun)) (G-DPV) is comparable to adjustable pressure valves (Codman Medos Hakim) (APV) in the treatment of post-aSAH hydrocephalus. METHODS: The use of a gravitational differential pressure valve is placed in direct comparison with an adjustable pressure valve system. A retrospective chart review is performed to compare the revision rates for the two valve systems. RESULTS: Within the registry from Radboud University Medical Center, 641 patients with a SAH could be identified from 1 January 2013 until 1 January 2019, whereas at the Heinrich Heine University, 617 patients were identified, totaling 1258 patients who suffered from aSAH. At Radboud University Medical Center, a gravitational differential pressure valve is used, whereas at the Heinrich Heine University, an adjustable pressure valve system is used. One hundred sixty-six (13%) patients required permanent ventricular peritoneal or atrial shunting. Shunt dysfunction occurred in 36 patients: 13 patients of the 53 (25%) of the gravitational shunt cohort, and in 23 of the 113 (20%) patients with an adjustable shunt (p = 0.54). Revision was performed at a mean time of 3.2 months after implantation with the gravitational system and 8.2 months with the adjustable shunt system. Combined rates of over- and underdrainage leading to revision were 7.5% (4/53) for the gravitational and 3.5% (4/113) for the adjustable valve system (p = 0 .27). CONCLUSION: The current study does not show a benefit of a gravitational pressure valve (GAV® system) over an adjustable pressure valve (CODMAN ® HAKIM®) in the treatment of post-aSAH hydrocephalus. The overall need for revision is high and warrants further improvements in care.
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- 2022
9. Effect of Activation of the GLT-1 Transporter by a Beta-Lactam Antibiotic on Serotonin-Induced Scratching Behavior in Mice
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Gunduz, O., Topuz, R. D., Todurga, Z. G., Duvan, K., Karadag, C. H., and Ulugol, A.
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- 2015
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10. Analysis of the anti-allodynic effects of combination of a synthetic cannabinoid and a selective noradrenaline re-uptake inhibitor in nerve injury-induced neuropathic mice
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Gunduz, O., Topuz, R. D., Karadag, C. H., and Ulugol, A.
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- 2016
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11. Synergistic effect of 5-amino-levulinic acid and gold nanoparticles in photodynamic therapy of immortalised human vestibular schwannoma cells
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Karadag, C, Gull, HH, Kahlert, UD, Hänggi, D, and Cornelius, JF
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ddc: 610 ,otorhinolaryngologic diseases ,610 Medical sciences ,Medicine - Abstract
Objective: Vestibular schwannoma (VS) is a common benign brain tumor. Current management includes wait and scan, surgery or stereotactic irradiation or a combination. Photo-dynamic therapy (PDT) was shown to be effective in a number of tumors. In order to explore novel adjuvant treatment strategies,[for full text, please go to the a.m. URL], 72. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), Joint Meeting mit der Polnischen Gesellschaft für Neurochirurgie
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- 2021
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12. The association of parent vessel asymmetry with the formation of an anterior communicating artery aneurysm
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Wetzel-Yalelis, A, Mijderwijk, HJ, Turowski, B, Hofmann, BB, Karadag, C, Gousias, K, Li, L, Kaiser, M, Agrawal, R, Petridis, A, Wetzel-Yalelis, A, Mijderwijk, HJ, Turowski, B, Hofmann, BB, Karadag, C, Gousias, K, Li, L, Kaiser, M, Agrawal, R, and Petridis, A
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- 2021
13. MTT Heterogeneity in Perfusion CT Imaging as a Predictor of Outcome after Aneurysmal SAH
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Hofmann, B.B., primary, Fischer, I., additional, Engel, A., additional, Jannusch, K., additional, Donaldson, D.M., additional, Karadag, C., additional, van Lieshout, J.H., additional, Beseoglu, K., additional, Muhammad, S., additional, Turowski, B., additional, Hänggi, D., additional, Kamp, M.A., additional, and Rubbert, C., additional
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- 2021
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14. Asymmetric dimethylarginine levels in thyroid diseases
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Arikan, E., Karadag, C. H., and Guldiken, S.
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- 2007
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15. Cultivation of primary chordoma cells and examination of 5-aminolevulinic acid based photodynamic therapy
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Gull, H, Karadag, C, Senger, B, Steiger, HJ, Hänggi, D, and Cornelius, JF
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musculoskeletal diseases ,ddc: 610 ,genetic structures ,610 Medical sciences ,Medicine - Abstract
Objective: Chordoma is a locally aggressive, osteodestructive and metastasizing tumor. Current adjuvant treatment is ineffective. New effective treatment modalities have to be explored. 5-ALA PDT has shown promise in proof of principle- experiments with im-mortalized human chordoma cell lines. The objective[for full text, please go to the a.m. URL], 71. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), 9. Joint Meeting mit der Japanischen Gesellschaft für Neurochirurgie
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- 2020
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16. Quality of life after neuro-surgery for haemangioblastoma - Von-Hippel-Lindau-Disease (VHL) versus Non-Von-Hippel-Lindau-Disease (NVHL)
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Karadag, C, Hänggi, D, Cornelius, JF, Karadag, C, Hänggi, D, and Cornelius, JF
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- 2020
17. Involvement of NMDA receptors and nitric oxide in the thermoregulatory effect of morphine in mice
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Ulugol, A., Dost, T., Dokmeci, D., Akpolat, M., Karadag, C. H., and Dokmeci, I.
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- 2000
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18. Optimization of beam profiles for improved piezoelectric energy harvesting efficiency
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Karadag, C. Volkan, primary, Ertarla, Seyda, additional, Topaloglu, Nezih, additional, and Okyar, A. Fethi, additional
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- 2020
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19. Verbessert sich die gesundheitsbezogene Lebensqualität für Patienten nach Vestibularisschwannomentfernung ?
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Kristin, J, additional, Glaas, M, additional, Schäfer, R, additional, Karadag, C, additional, Cornelius, JF, additional, and Schipper, J, additional
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- 2020
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20. Does health-related quality of life improve for patients after vestibular swannoma removal ?
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Kristin, J, additional, Glaas, M, additional, Schäfer, R, additional, Karadag, C, additional, Cornelius, JF, additional, and Schipper, J, additional
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- 2020
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21. Is there A Relationship between route of delivery, perinatal characteristics, and neonatal outcome in preterm birth?
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Dolgun, ZN, primary, Inan, C, additional, Altintas, AS, additional, Okten, SB, additional, Karadag, C, additional, and Sayin, NC, additional
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- 2018
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22. Relationship between Annexin A2 levels and response to chemoradiotherapy in patients with local advanced stage non-small cell lung cancer
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Yılmaz, Semih, Çimen, Leyla, Ülker Çakır, Dilek, Tufanoglu, Nur, Karadag, C, Eroğlu, Celalettin, Tekin, B, Çifçi, Ahmet, Çetin, Aysun, and Zararsız, Gökmen
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- 2016
23. Direct Borohydride Fuel Cell
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İyigün Karadağ, Ç
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- 2015
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24. Investigation Of Carbon Supported Nanostructured Ptau Alloy As Electrocatalyst For Direct Borohydride Fuel Cell
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Karadag, C. Iyigun, Behmenyar, G., San, F. G. Boyaci, and Sener, T.
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Carbon supported bimetallic PtAu electrocatalysts for sodium borohydride electrooxidation are prepared by a modified citrate stabilized NaBH4 reduction process at different pH and temperature values. The physical properties of the materials are characterized by X-ray diffraction spectroscopy, energy dispersive spectrometry, X-ray photoelectron spectroscopy and transmission electron microscopy. Nano sized electrocatalysts have narrow size distributions and are uniformly dispersed on the surface of carbon support. Electrochemical performances of catalysts for sodium borohydride electrooxidation are tested with 25 cm(2) single fuel cell. The highest performance is obtained at a peak power density of 161 mWcm(-2) with 20 wt. % PtAu/C catalyst of 7.03 nm. Impact of the fuel cell operation parameters including concentration of NaBH4, flow rates of oxidant and fuel, and fuel cell operation temperature are investigated. The best operation parameters are obtained at 1 M NaBH4 concentration, 3 cm(3) min(-1) NaBH4 flow rate, 0.2 dm(3) min(-1) oxygen flow rate and 65 degrees C fuel cell temperature.
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- 2015
25. Ethical Dilemmas In Disaster Medicine
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Ozge Karadag, C, Kerim Hakan, A, and Halk Sağlığı
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Disasters ,Ethics ,Public health ,Disaster medicine ,Review Article ,Bioethics - Abstract
Background Disasters may lead to ethical challenges that are different from usual medical practices. In addition, disaster situations are related with public health ethics more than medical ethics, and accordingly may require stronger effort to achieve a balance between individual and collective rights. This paper aims to review some ethical dilemmas that arise in disasters and mainly focuses on health services. Disasters vary considerably with respect to their time, place and extent; therefore, ethical questions may not always have `one-size-fits-all` answers. On the other hand, embedding ethical values and principles in every aspect of health-care is of vital importance. Reviewing legal and organizational regulations, developing health-care related guidelines, and disaster recovery plans, establishing on-call ethics committees as well as adequate in-service training of health-care workers for ethical competence are among the most critical steps. It is only by making efforts before disasters, that ethical challenges can be minimized in disaster responses.
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- 2012
26. ABSTRACT 858
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Telhan, L., primary, Oral, A., additional, Karadag, C., additional, Usta, M., additional, and Kamaci, T., additional
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- 2014
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27. Efficacy of royal jelly on methotrexate-induced systemic oxidative stress and damage to small intestine in rats
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Kaynar, L, primary, Cetin, A, additional, Hacioglu, SK, additional, Eser, B, additional, Koçyigit, I, additional, Canöz, Ö, additional, Tasdemir, A, additional, Karadag, C, additional, Kurnaz, F, additional, Saraymen, R, additional, and Silici, S, additional
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- 2012
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28. Evaluation of Iloprost to Prevent Vasospasm in Coronary Artery Bypass Grafts.
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EGE, T., GUR, O., KARADAG, C. H., and DURAN, E.
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- 2010
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29. The efficacy of linear polarized polychromatic light on burn wound healing: an experimental study on rats.
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Akci Karadag C, Birtane M, Aygit AC, Uzunca K, Doganay L, Karadag, Ceyda Akci, Birtane, Murat, Aygit, A Cemal, Uzunca, Kaan, and Doganay, Latife
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- 2007
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30. Red blood cell in preeclampsia: attenuated nitric oxide generation and enhanced reactive oxygen species formation and eryptosis.
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Turan Butun T, Özen N, Ozturk N, Yildirim A, Kilavuz E, Karadag C, Aykan Yuksel B, Basrali F, Karadag B, and Ulker P
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Preeclampsia (PE) pathogenesis is strongly related to diminished nitric oxide (NO) bioavailability and enhanced oxidative stress. Emerging evidence suggests that red blood cells (RBCs) eNOS enzyme contributes to systemic NO bioavailability by its ability of both NO and ROS generation. We aimed to investigate RBC eNOS enzyme activity, NO and ROS generation capacity, eryptosis index and aggregation levels in preeclamptic and uncomplicated pregnant women. Fifty-eight PE patients and 36 healthy pregnant women were included to the investigation. RBC eNOS enzyme activity, intracellular NO, calcium and ROS concentrations and eryptosis levels were determined via flow cytometric methods. RBC deformability and aggregation were measured via LORRCA. Intracellular NO and phosphorylated RBC eNOS levels decreased in PE group compared to healthy pregnant group ( p < 0.05, p < 0.001 respectively). Intracellular ROS and calcium levels, eryptosis values and aggregation indexes in the PE group were significantly higher than healthy pregnant group ( p < 0.05, p < 0.01, p < 0.05, p < 0.05 respectively). Our results demonstrate for the first time that RBC produce lower NO and higher ROS under PE conditions. Further, RBC of PE patients were more prone to eryptosis and aggregation compared to control group. Our results suggest that, in addition to endothelial cells, RBC also contribute to decreased plasma NO bioavailability via producing less NO and high ROS in PE. Considering increased tendency to eryptosis and aggregation, RBC seem to play role in haemodynamic changes of PE pathogenesis.
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- 2024
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31. The rupture of an anterior communicating artery aneurysm does not associate with an asymmetry in the A1 or A2 arteries: a retrospective study of radiological features.
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Wetzel-Yalelis A, Karadag C, Li L, Turowski B, Bostelmann R, Abusabha Y, Hofmann BB, Gousias K, Agrawal R, König M, Kaiser M, Mijderwijk HJ, and Petridis AK
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- Humans, Retrospective Studies, Female, Male, Middle Aged, Aged, Adult, Anterior Cerebral Artery diagnostic imaging, Aged, 80 and over, Risk Factors, Intracranial Aneurysm diagnostic imaging, Aneurysm, Ruptured diagnostic imaging, Cerebral Angiography
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Background and Objectives: Although the formation and rupture risk of an anterior communicating artery (ACoA) aneurysm has been the subject of many studies, no previous study has primarily searched for the relationship of the parent and daughter vessels and the impact of their size/diameter ratio on the potential rupture risk of an AcoA aneurysm. The objective of this study is to explore this link and to further analyse the surrounding vasculature of the anterior communicating artery aneurysm., Materials and Methods: We conducted a retrospective analysis of 434 patients: 284 patients with an ACoA aneurysm (121 unruptured and 162 ruptured) and 150 control patients without an ΑCoA aneurysm. Radiological angiography investigations were used to assess the diameter ratios of the parent vessels in addition to ACoA aneurysm morphology parameters., Results: When comparing the ruptured to the unruptured cases, we observed no significant difference in the parent or daughter vessel diameter ratios. Younger patient age (OR 0.96, p = 0.00) and a higher aneurysm size ratio (OR 1.10, p = 0.02) were of prognostic importance concerning the rupture risk of the aneurysm. The A1 diameter ratio and the A2 diameter were not statistically significant (OR 1.00, p = 0.99, and OR 3.38, p = 0.25 respectively)., Conclusions: In our study, we focused on asymmetry in the parent and daughter vessels as well as traditional ACoA aneurysm morphological characteristics. We were able to label younger patient age and a greater size ratio as independent prognostic factors for ACoA aneurysm rupture. We were unable to label parent and daughter vessel asymmetry as prognostic factors. To validate our findings, parent and daughter vessel asymmetry should be subjected to future prospective studies.
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- 2024
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32. Revisiting the WFNS Score: Native Computed Tomography Imaging Improves Identification of Patients With "False Poor Grade" Aneurysmal Subarachnoid Hemorrhage.
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Hofmann BB, Fischer I, Neyazi M, Karadag C, Donaldson DM, Abusabha Y, Muhammad S, Beseoglu K, Cornelius JF, and Hänggi D
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- Humans, Treatment Outcome, Retrospective Studies, Tomography, X-Ray Computed, Societies, Subarachnoid Hemorrhage diagnostic imaging, Subarachnoid Hemorrhage surgery
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Background and Objectives: In patients suffering from aneurysmal subarachnoid hemorrhage (aSAH), the optimal time to determine the World Federation of Neurosurgical Societies (WFNS) score remains controversial because of possible confounding factors. Goals of this study were (1) to analyze the most sensitive timepoint to determine the WFNS score in patients with aSAH and (2) to evaluate the impact of initial native computed tomography (CT) imaging on reducing the mismatch of "false poor grade" patients., Methods: We retrospectively analyzed daily WFNS scores from admission until day 7 in 535 aSAH patients and evaluated their predictive value for the modified Rankin Scale at discharge and 6 months postbleeding. Patients with an initial WFNS score of IV-V who showed improvement to a WFNS score of I-II within the first 7 days (even short-term) were defined as "false poor grade" patients. We tried to identify the "false poor grade" patients using parameters of the initial native CT imaging., Results: Later determination of the WFNS score (day 1 vs 7; pseudo-R 2 = 0.13 vs 0.21) increasingly improved its predictive value for neurological outcome at discharge ( P < .001). We identified 39 "false poor grade" patients who had significantly better outcomes than "real poor grade" patients (N = 220) (modified Rankin Scale-discharge: 0-2, 56% vs 1%, P < .001; 3-5: 41% vs 56%, P = .12; 6: 3% vs 43%, P < .001). "False poor grade" patients differed significantly in initial CT parameters. A predictive model called "initial CT WFNS" ( ICT WFNS) was developed, incorporating SEBES, Hijdra score, and LeRoux score (sensitivity = 0.95, specificity = 0.84, accuracy = 0.859, F1 = 0.673). ICT WFNS scores of ≤4.6 classified patients as "false poor grade.", Conclusion: The initial WFNS score may misclassify a subgroup of patients with aSAH as poor grade, which can be avoided by later determination of the WFNS score, at days 3-4 losing its usefulness. Alternatively, the initial WFNS score can be improved in its predictive value, especially in poor-grade patients, using criteria from the initial native CT imaging, such as the Hijdra, LeRoux, and Subarachnoid Hemorrhage Early Brain Edema score, combined in the ICT WFNS score with even higher predictive power., (Copyright © Congress of Neurological Surgeons 2023. All rights reserved.)
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- 2024
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33. Novel Insights into Pathophysiology of Delayed Cerebral Ischemia: Effects of Current Rescue Therapy on Microvascular Perfusion Heterogeneity.
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Hofmann BB, Karadag C, Rubbert C, Schieferdecker S, Neyazi M, Abusabha Y, Fischer I, Boogaarts HD, Muhammad S, Beseoglu K, Hänggi D, Turowski B, Kamp MA, and Cornelius JF
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General microvascular perfusion and its heterogeneity are pathophysiological features of delayed cerebral ischemia (DCI) that are gaining increasing attention. Recently, CT perfusion (CTP) imaging has made it possible to evaluate them radiologically using mean transit time (MTT) and its heterogeneity (measured by cvMTT). This study evaluates the effect of multimodal rescue therapy (intra-arterial nimodipine administration and elevation of blood pressure) on MTT and cvMTT during DCI in aneurysmal subarachnoid haemorrhage (aSAH) patients. A total of seventy-nine aSAH patients who underwent multimodal rescue therapy between May 2012 and December 2019 were retrospectively included in this study. CTP-based perfusion impairment (MTT and cvMTT) on the day of DCI diagnosis was compared with follow-up CTP after initiation of combined multimodal therapy. The mean MTT was significantly reduced in the follow-up CTP compared to the first CTP (3.7 ± 0.7 s vs. 3.3 ± 0.6 s; p < 0.0001). However, no significant reduction of cvMTT was observed (0.16 ± 0.06 vs. 0.15 ± 0.06; p = 0.44). Mean arterial pressure was significantly increased between follow-up and first CTP (98 ± 17 mmHg vs. 104 ± 15 mmHg; p < 0.0001). The combined multimodal rescue therapy was effective in addressing the general microvascular perfusion impairment but did not affect the mechanisms underlying microvascular perfusion heterogeneity. This highlights the need for research into new therapeutic approaches that also target these pathophysiological mechanisms of DCI.
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- 2023
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34. Initial Temporal Muscle Thickness and Area: Poor Predictors of Neurological Outcome in Aneurysmal Subarachnoid Hemorrhage in a Central European Patient Cohort.
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Karadag C, Kamp MA, Fischer I, Boogaarts HD, Beseoglu K, Muhammad S, Cornelius JF, and Hofmann BB
- Abstract
The temporalis muscle area (TMA) has been proclaimed as a surrogate parameter for estimating skeletal muscle mass. Pilot studies in Asian populations suggested temporal muscle thickness (TMT) and TMA as prognostic factors for neurological outcomes in aneurysmal subarachnoid hemorrhage (aSAH) patients. This study aimed to validate these findings in a larger European patient cohort. We retrospectively analyzed age, sex, aneurysm location, treatment, World Federation of Neurosurgical Societies (WFNS) grade, Fisher score, and modified Rankin Score (mRS) at six months in patients with aSAH. TMT and TMA measurements were obtained from initial native CT scans. Logistic regression with the dichotomized six-month mRS as the outcome incorporating TMT, weighted average of TMT, or TMA as predictors was performed. Of the included 478 patients, 66% were female, the mean age was 56, and 48% of patients had an mRS of three to six after six months. The mean TMT at the level of the Sylvian fissure was 5.9 (±1.7) mm in males and 4.8 (±1.8) mm in females. The mean TMA was 234.5 (±107.9) mm
2 in females and 380 (±134.1) mm2 in males. WFNS grade ( p < 0.001), Fisher score ( p < 0.001), and age ( p < 0.05) correlated significantly with the mRS after six months. No correlation was found between mRS after six months and the TMT at the Sylvian fissure ( p = 0.3), the weighted average of TMT ( p = 0.1), or the TMA ( p = 0.1). In this central European patient cohort of 478 individuals, no significant associations were found between TMT/TMA and neurological outcomes following aSAH. Further prospective studies in diverse patient populations are necessary to determine the prognostic value of TMA and TMT in aSAH patients.- Published
- 2023
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35. Blood Pressure Affects the Early CT Perfusion Imaging in Patients with aSAH Reflecting Early Disturbed Autoregulation.
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Hofmann BB, Donaldson DM, Fischer I, Karadag C, Neyazi M, Piedade GS, Abusabha Y, Muhammad S, Rubbert C, Hänggi D, and Beseoglu K
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- Humans, Blood Pressure, Retrospective Studies, Tomography, X-Ray Computed methods, Perfusion Imaging, Homeostasis, Subarachnoid Hemorrhage complications, Hypotension
- Abstract
Background: Early computed tomography perfusion (CTP) is frequently used to predict delayed cerebral ischemia following aneurysmatic subarachnoid hemorrhage (aSAH). However, the influence of blood pressure on CTP is currently controversial (HIMALAIA trial), which differs from our clinical observations. Therefore, we aimed to investigate the influence of blood pressure on early CTP imaging in patients with aSAH., Methods: We retrospectively analyzed the mean transit time (MTT) of early CTP imaging within 24 h after bleeding prior to aneurysm occlusion with respect to blood pressure shortly before or after the examination in 134 patients. We correlated the cerebral blood flow with the cerebral perfusion pressure in the case of patients with intracranial pressure measurement. We performed a subgroup analysis of good-grade (World Federation of Neurosurgical Societies [WFNS] I-III), poor-grade (WFNS IV-V), and solely WFNS grade V aSAH patients., Results: Mean arterial pressure (MAP) significantly correlated inversely with the mean MTT in early CTP imaging (R = - 0.18, 95% confidence interval [CI] - 0.34 to - 0.01, p = 0.042). Lower mean blood pressure was significantly associated with a higher mean MTT. Subgroup analysis revealed an increasing inverse correlation when comparing WFNS I-III (R = - 0.08, 95% CI - 0.31 to 0.16, p = 0.53) patients with WFNS IV-V (R = - 0.2, 95% CI - 0.42 to 0.05, p = 0.12) patients, without reaching statistical significance. However, if only patients with WFNS V are considered, a significant and even stronger correlation between MAP and MTT (R = - 0.4, 95% CI - 0.65 to 0.07, p = 0.02) is observed. In patients with intracranial pressure monitoring, a stronger dependency of cerebral blood flow on cerebral perfusion pressure is observed for poor-grade patients compared with good-grade patients., Conclusions: The inverse correlation between MAP and MTT in early CTP imaging, increasing with the severity of aSAH, suggests an increasing disturbance of cerebral autoregulation with the severity of early brain injury. Our results emphasize the importance of maintaining physiological blood pressure values in the early phase of aSAH and preventing hypotension, especially in patients with poor-grade aSAH., (© 2023. The Author(s).)
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- 2023
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36. Evaluation of MTT Heterogeneity of Perfusion CT Imaging in the Early Brain Injury Phase: An Insight into aSAH Pathopysiology.
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Hofmann BB, Fischer I, Donaldson DM, Abusabha Y, Karadag C, Muhammad S, Beseoglu K, Hänggi D, Turowski B, Rubbert C, Cornelius JF, and Kamp MA
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The concept of early brain injury (EBI) is based on the assumption of a global reduction in brain perfusion following aneurysmal subarachnoid hemorrhage (aSAH). However, the heterogeneity of computed tomography perfusion (CTP) imaging in EBI has not yet been investigated. In contrast, increased mean transit time (MTT) heterogeneity, a possible marker of microvascular perfusion heterogeneity, in the delayed cerebral ischemia (DCI) phase has recently been associated with a poor neurological outcome after aSAH. Therefore, in this study, we investigated whether the heterogeneity of early CTP imaging in the EBI phase is an independent predictor of the neurological outcome after aSAH. We retrospectively analyzed the heterogeneity of the MTT using the coefficient of variation (cvMTT) in early CTP scans (within 24 h after ictus) of 124 aSAH patients. Both linear and logistic regression were used to model the mRS outcome, which were treated as numerical and dichotomized values, respectively. Linear regression was used to investigate the linear dependency between the variables. No significant difference in cvMTT between the patients with and those without EVD could be observed ( p = 0.69). We found no correlation between cvMTT in early CTP imaging and initial modified Fisher ( p = 0.07) and WFNS grades ( p = 0.23). The cvMTT in early perfusion imaging did not correlate significantly with the 6-month mRS for the entire study population ( p = 0.15) or for any of the subgroups (without EVD: p = 0.21; with EVD: p = 0.3). In conclusion, microvascular perfusion heterogeneity, assessed by the heterogeneity of MTT in early CTP imaging, does not appear to be an independent predictor of the neurological outcome 6 months after aSAH.
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- 2023
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37. Factors that contribute to the recurrence of mucinous ovarian cancer: Monocenter retrospective evaluation.
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Birge O, Bakır MS, Karadag C, Doğan S, Tuncer HA, and Simsek T
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- Humans, Female, Carcinoma, Ovarian Epithelial, Retrospective Studies, Neoplasm, Residual pathology, Neoplasm Recurrence, Local epidemiology, Neoplasm Recurrence, Local pathology, Prognosis, Neoplasm Staging, Ovarian Neoplasms epidemiology, Ovarian Neoplasms surgery, Adenocarcinoma, Mucinous epidemiology, Adenocarcinoma, Mucinous therapy, Adenocarcinoma, Mucinous pathology
- Abstract
Purpose: In this study, we aimed to put forth the factors that contribute to the recurrence of mucinous ovarian cancer., Materials and Methods: Forty-four mucinous ovarian cancer patients who have presented to our clinic between February 2006 and May 2018 took part in the study. In order to predict the factors that contribute to recurrence, the univariate and the multivariate logistic regressions were utilized. The Kaplan-Meier survival analysis was utilized for survival and the log-rank test was used for the discrepancies between the groups. In the analysis of the data, the Statistical Package for the Social Sciences 22 program was used. It was acknowledged to have statistical meaning when the P value in all the tests was lower than 0.05., Findings: Recurrence was detected in 20 out of 44 patients who participated in the study. The ages of the patients who did not experience recurrence were significantly lower ( P = 0.001). The patients were detected mostly in Stage 1 (36.4%). In the group of patients without recurrence, systemic lymphadenectomy (43.2%) was greater ( P = 0.019). Lymph node metastasis was three times higher in the group that experienced recurrence ( P = 0.047). When the two groups were compared, the platinum resistance was considerably greater in the group with recurrence ( P = 0.005). In terms of residual tumor, the rate of complete resection was (9%) better in the group that experienced recurrence compared to the group that did not experience recurrence, with a rate of 45.5%. While 12 patients who experienced recurrence died, 6 people died in the other group. From the factors that contribute to recurrence, in terms of residual tumor quantity, this was grouped as complete (R0) resection and optimal + suboptimal (R1 + R2) resection and the following were determined: odds ratio (OR) - 5.7 (95% confidence interval [CI]: 1.56-20.9) and P = 0.008 for R1 + R2. In univariate analysis, the OR was determined as 1.16 (95% CI: 1.06-1.27) for age. Possessing a Stage 2 and higher disease statistically contributed considerably to the recurrence compared to Stage 1 disease (OR: 6.33; 95% CI: 1.59-25.22; P = 0.009). Age was determined as an independent prognostic risk factor in the multivariate analysis (OR: 1.10 [95% CI: 1.04-1.25]), P = 0.018. Furthermore, the OR for the advanced-stage (Stage 2 or higher) patients in the multivariate analysis was determined as 7.88 (95% CI: 0.78-78.8) and was found to be statistically significant at limits ( P = 0.079)., Results: We have put forth that the genetic, biological, and clinical characteristics of mucinous ovarian cancers differ from that of other epithelial ovarian cancers, and that age, advanced stage, and residual tumor quantity are prognostic risk factors in terms of recurrence, and that age is an independent prognostic risk factor., Conclusion: Biological and clinical characteristics of mucinous ovarian cancers differ from those of other epithelial ovarian cancers, and we observed that the age, advanced stage, and the amount of residual tumor regarding recurrence are prognostic risk factors, while age was determined as an independent prognostic risk factor., Competing Interests: None
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- 2023
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38. McCall culdoplasty vs. vaginally assisted laparoscopic sacrocolpopexy in the treatment of advanced uterine prolapse: A randomized controlled study.
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Karadag B, Mulayim B, Karadag C, Akdaş BA, Karataş S, Yüksel BA, and Tatar SA
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- Humans, Female, Hysterectomy, Vaginal methods, Valsartan, Treatment Outcome, Gynecologic Surgical Procedures methods, Uterine Prolapse surgery, Pelvic Organ Prolapse surgery, Laparoscopy methods
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Objective: The primary aim of this study was to compare the anatomic outcomes of vaginally assisted laparoscopic sacrocolpopexy (VALS) with those of McCall culdoplasty (McCC) in patients undergoing concurrent vaginal hysterectomy., Materials and Methods: This randomized controlled study presents the outcomes of 68 patients who underwent hysterectomy and vaginal suspension for apical prolapse ≥ Stage III according to the Pelvic Organ Prolapse Quantification (POP-Q) system between October 2017 and December 2020. Among these patients, 33 underwent VALS and 35 underwent McCC. Clinical features, surgical data, concomitant surgical procedures, postoperative complications, and recurrence rates were assessed. Before and after one year of surgery, the short form of the Pelvic Floor Impact Questionnaire and Pelvic Organ Prolapse/Urinary Incontinence Sexual Questionnaire were used to evaluate subjective symptoms. Patient Global Impression of Improvement Questionnaire was used to assess patient satisfaction., Results: The mean follow-up durations were 25.5 ± 7.63 months and 25.6 ± 5.96 months in the VALS and McCC groups, respectively. Prolapse recurrence occurred in 3 (9.1%) women in the VALS group versus 12 (34.3%) women in the McCC group (p = 0.031)., Conclusion: The McCC operation was associated with a shorter operation time, whereas the VALS operation had a significantly higher objective success rate. Based on this study, it may be concluded that McCC is not an effective procedure for advanced uterine prolapse., Competing Interests: Declaration of Competing Interest The authors declared no conflict of interest., (Copyright © 2023. Published by Elsevier B.V.)
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- 2023
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39. Defining activities in neurovascular microsurgery training: entrustable professional activities for vascular neurosurgery.
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van Lieshout JH, Malzkorn B, Steiger HJ, Karadag C, Kamp MA, Vajkoczy P, Beck J, Peschillo S, Rohde V, Walsh D, Lukshin V, Korja M, Cenzato M, Raabe A, Gruber A, Hänggi D, and Boogaarts HD
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- Humans, Competency-Based Education methods, Microsurgery, Clinical Competence, Neurosurgery, Internship and Residency, Aneurysm
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Background: Entrustable professional activities (EPAs) represent an assessment framework with an increased focus on competency-based assessment. Originally developed and adopted for undergraduate medical education, concerns over resident ability to practice effectively after graduation have led to its implementation in residency training but yet not in vascular neurosurgery. Subjective assessment of resident or fellow performance can be problematic, and thus, we aim to define core EPAs for neurosurgical vascular training., Methods: We used a nominal group technique in a multistep interaction between a team of experienced neurovascular specialists and a medical educator to identify relevant EPAs. Panel members provided feedback on the EPAs until they reached consent., Results: The process produced seven core procedural EPAs for vascular residency and fellowship training, non-complex aneurysm surgery, complex aneurysm surgery, bypass surgery, arteriovenous malformation resection, spinal dural fistula surgery, perioperative management, and clinical decision-making., Conclusion: These seven EPAs for vascular neurosurgical training may support and guide the neurosurgical society in the development and implementation of EPAs as an evaluation tool and incorporate entrustment decisions in their training programs., (© 2022. The Author(s).)
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- 2023
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40. Risk of uterine niche following single-layer locked versus unlocked uterine closure: a randomized study.
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Bayraktar R, Mulayim B, Tamburaci E, Karadag C, and Karadag B
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- Humans, Pregnancy, Female, Suture Techniques adverse effects, Uterus surgery, Uterus pathology, Sutures, Cesarean Section adverse effects, Cesarean Section methods, Cicatrix etiology
- Abstract
Introduction: The primary objective of the present study is to evaluate the effect of single-layer locked versus single-layer unlocked uterine closure techniques on the development of uterine niche. The secondary objective is to evaluate the effect of the ratio of lower uterine segment (LUS) to upper uterine segment (UUS) on the development of uterine niche, which was not previously investigated in literature but which the authors consider to be a major risk factor for the development of uterine niche., Methods: Included in this randomized study were 194 patients who were admitted to the Department of Obstetrics and Gynecology at Health Sciences University Antalya Training and Research Hospital and who underwent cesarean section (CS) due to any reason between October 2017 and May 2018. Two different techniques were used in the closure of hysterotomy: Single-layer locked continuous suturing (Group 1) and single-layer unlocked continuous suturing (Group 2). During surgery, the thicknesses of the LUS and UUS were measured using a sterile scale prior to hysterotomy closure. The patients were evaluated for the development of uterine niche at postoperative six months by transvaginal ultrasound., Results: Control transvaginal ultrasound performed at six months after surgery revealed uterine niches in 58 out of 194 patients (29.29%; 34 patients in Group 1 [34.3%] and 24 patients in Group 2 [25.3%]). No significant difference was noted in terms of the development of uterine niche between the two groups ( p = .167). The mean LUS and UUS in patients without uterine niche development were 6.81 ± 1.26 mm and 9.38 ± 1.26 mm, whereas the mean LUS and UUS in patients with uterine niche development were 4.24 ± 1.15 mm and 9.21 ± 2.15, respectively ( p = .001 and p = .236). The mean UUS/LUS ratio is 1.4 ± 0.16 among patients without uterine niche and 2.21 ± 0.31 in patients with uterine niche ( p < .001)., Conclusions: The present study found no statistically significant difference in niche size between the two groups. However, the study reports that the ratio of upper to lower uterine segment that was not previously investigated in literature is a major risk factor for the development of uterine niche.
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- 2022
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41. Non-adjustable gravitational valves or adjustable valves in the treatment of hydrocephalus after aneurysmal subarachnoid hemorrhage patients?
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Arts S, van Lieshout JH, van Bilsen M, Karadag C, Beez T, van den Abbeele L, Aquarius R, Vinke S, Bartels RHMA, van Lindert EJ, Hänggi D, and Boogaarts HD
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- Humans, Retrospective Studies, Postoperative Complications surgery, Gravitation, Cerebrospinal Fluid Shunts, Ventriculoperitoneal Shunt, Subarachnoid Hemorrhage complications, Subarachnoid Hemorrhage surgery, Hydrocephalus etiology, Hydrocephalus surgery
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Purpose: Hydrocephalus requiring permanent CSF shunting after aneurysmal subarachnoid hemorrhage (aSAH) is frequent. It is unknown which type of valve is optimal. This study evaluates if the revision rate of gravitational differential pressure valves (G-DPVs, GAV® system (B Braun)) (G-DPV) is comparable to adjustable pressure valves (Codman Medos Hakim) (APV) in the treatment of post-aSAH hydrocephalus., Methods: The use of a gravitational differential pressure valve is placed in direct comparison with an adjustable pressure valve system. A retrospective chart review is performed to compare the revision rates for the two valve systems., Results: Within the registry from Radboud University Medical Center, 641 patients with a SAH could be identified from 1 January 2013 until 1 January 2019, whereas at the Heinrich Heine University, 617 patients were identified, totaling 1258 patients who suffered from aSAH. At Radboud University Medical Center, a gravitational differential pressure valve is used, whereas at the Heinrich Heine University, an adjustable pressure valve system is used. One hundred sixty-six (13%) patients required permanent ventricular peritoneal or atrial shunting. Shunt dysfunction occurred in 36 patients: 13 patients of the 53 (25%) of the gravitational shunt cohort, and in 23 of the 113 (20%) patients with an adjustable shunt (p = 0.54). Revision was performed at a mean time of 3.2 months after implantation with the gravitational system and 8.2 months with the adjustable shunt system. Combined rates of over- and underdrainage leading to revision were 7.5% (4/53) for the gravitational and 3.5% (4/113) for the adjustable valve system (p = 0 .27)., Conclusion: The current study does not show a benefit of a gravitational pressure valve (GAV® system) over an adjustable pressure valve (CODMAN ® HAKIM®) in the treatment of post-aSAH hydrocephalus. The overall need for revision is high and warrants further improvements in care., (© 2022. The Author(s).)
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- 2022
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42. Evaluation of elderly women with uterin cervical cancer.
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Birge Ö, Bakır MS, Karadag C, Doğan S, Tuncer HA, and Simsek T
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- Aged, Aged, 80 and over, Child, Child, Preschool, Disease-Free Survival, Female, Humans, Retrospective Studies, Risk Factors, Carcinoma, Squamous Cell therapy, Uterine Cervical Neoplasms diagnosis, Uterine Cervical Neoplasms epidemiology, Uterine Cervical Neoplasms therapy
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Background: Uterine cervical cancer rates also increase with aging. Especially, the primary treatments of patients with cervical cancer include surgery, chemotherapy, and radiotherapy., Aim: Our aim is to discuss the effect of clinical and histopathological risk factors on survival in patients over 65 years old with invasive cervical cancer in the light of the literature., Methods and Results: The files of 60 patients aged 65 and over who were diagnosed, examined, and treated for invasive cervical uteri cancer between 2004 and 2021 by the gynecological oncology clinic of Akdeniz University were analyzed retrospectively after obtaining approval from the Akdeniz University ethics committee with the number KAEK-110. Detailed written consent was obtained from all patients and their relatives for data analysis. Patients aged 65 and over who were diagnosed with invasive cervical uteri cancer at all stages who accepted treatment were included in the study. The patients who were not included in the study were those who did not accept treatment, did not continue their follow-up regularly, were under 65 years of age, had preinvasive cervical lesion, had a second primary cancer, had an unknown stage, and died due to accidents or similar reasons. When the demographic data of 60 cases were examined, the mean age was 70.5, the youngest age was 65, and the oldest age was 84. When we divided them into two groups by age groups, 76.7% were between 65 and 75 years old and 23.3% were over 75 years old. When the data of 60 patients who were referred to our hospital, which was a tertiary center in the 15 years duration, were examined, the mean disease-progression free survival (PFS) of patients with locally advanced stage was 45 months, however, it was 4 months for metastatic patients, this difference was significant and a statistically significant difference was found between the two groups (p: .001). When the total survival was examined, the mean was 108.7 months in the locally advanced stage group, while it was 2.9 months in metastatic cases, and this difference was also statistically significant between the two groups (p: .001). When we divide the cases into two groups as between 65 and 75 and over 75 years of age, the mean age of disease-free survival is 76.9 months in the 65-75 years old group, while 16 months in the 76-85 years old group, however, the p value of this difference in PFS between the two groups was not significant (p: 0.154). However, when the total survival was examined, it was seen that the mean was 140.4 in the 65-75 years old group, while it was 56 months in the 76-85 years old group and this difference was significant between the two groups (p: .046)., Conclusion: In parallel with the increased population worldwide, advanced age cancer rates are increasing. In parallel with the population growth, it should be remembered that the patients over 65 years of age who were diagnosed with invasive uterine cervical cancer had difficulty in accessing screening tests, late diagnosis and inadequate treatment regimens due to concomitant diseases, resulting in recurrence in a short time and poor clinical symptoms due to short total survival., (© 2021 The Authors. Cancer Reports published by Wiley Periodicals LLC.)
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- 2022
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43. Development and Internal Validation of the ARISE Prediction Models for Rebleeding After Aneurysmal Subarachnoid Hemorrhage.
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van Lieshout JH, Mijderwijk HJ, Nieboer D, Lingsma HF, Ahmadi SA, Karadag C, Muhammad S, Porčnik A, Wasilewski D, Wessels L, van Donkelaar CE, van Dijk JMC, Hänggi D, and Boogaarts HD
- Subjects
- Cohort Studies, Humans, Prognosis, Prospective Studies, Retrospective Studies, Treatment Outcome, Intracranial Aneurysm complications, Intracranial Aneurysm surgery, Subarachnoid Hemorrhage complications, Subarachnoid Hemorrhage surgery
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Background: Aneurysmal rerupture is one of the most important determents for outcome after aneurysmal subarachnoid hemorrhage and still occurs frequently because individual risk assessment is challenging given the heterogeneity in patient characteristics and aneurysm morphology., Objective: To develop and internally validate a practical prediction model to estimate the risk of aneurysmal rerupture before aneurysm closure., Methods: We designed a multinational cohort study of 2 prospective hospital registries and 3 retrospective observational studies to predict the risk of computed tomography confirmed rebleeding within 24 and 72 hours after ictus. We assessed predictors with Cox proportional hazard regression analysis., Results: Rerupture occurred in 269 of 2075 patients. The cumulative incidence equaled 7% and 11% at 24 and 72 hours, respectively. Our base model included hypertension, World Federation of Neurosurgical Societies scale, Fisher grade, aneurysm size, and cerebrospinal fluid drainage before aneurysm closure and showed good discrimination with an optimism corrected c-statistic of 0.77. When we extend the base model with aneurysm irregularity, the optimism-corrected c-statistic increased to 0.79., Conclusion: Our prediction models reliably estimate the risk of aneurysm rerupture after aneurysmal subarachnoid hemorrhage using predictor variables available upon hospital admission. An online prognostic calculator is accessible at https://www.evidencio.com/models/show/2626 ., (Copyright © Congress of Neurological Surgeons 2022. All rights reserved.)
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- 2022
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44. Non-Animal Models in Experimental Subarachnoid Hemorrhage Research: Potentials and the Dilemma of the Translation from Bench to Bedside.
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Karadag C, Gopalakrishnan J, von Saß C, Cornelius JF, Hänggi D, van Lieshout JH, and Kamp MA
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- Animals, Disease Models, Animal, Subarachnoid Hemorrhage therapy, Vasospasm, Intracranial
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- 2022
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45. Clinicopathological Analysis of Neuroendocrine Carcinoma of the Uterine Cervix: A Single-Institution Retrospective Review of 9 Cases.
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Sağnıç S, Birge Ö, Bakır MS, Karadag C, and Şimşek T
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- Adult, Aged, Antineoplastic Combined Chemotherapy Protocols, Cesarean Section, Female, Humans, Middle Aged, Neoplasm Recurrence, Local pathology, Neoplasm Staging, Prognosis, Retrospective Studies, Carcinoma, Neuroendocrine diagnosis, Carcinoma, Neuroendocrine drug therapy, Carcinoma, Neuroendocrine surgery, Uterine Cervical Neoplasms pathology, Uterine Cervical Neoplasms surgery
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Aim: To evaluate the clinicopathological features affecting the recurrence and survival of 9 cases of neuroendocrine cancer of the cervix., Method: We retrospectively analyzed 9 cervical neuroendocrine cancer cases identified among 453 cervical cancer patients between 2004 and 2021 at Akdeniz University Gynecological Oncology Outpatient Clinic. Kaplan-Meier survival analysis was used for progression-free survival (PFS) and overall survival (OS). Mathematical functions of mean, standard deviation, median, Min-Max values, and frequencies were used for descriptive statistics. The categorical data were expressed in numbers and percentages (%)., Results: Nine patients with neuroendocrine histological subtype were selected out of 453 patients diagnosed with cervical cancer (1.98%). The average overall survival time of the patients was 26 months. The 5-year survival rate was 53.3%, while the PFS was 62.5%. The most common subtype was small cell neuroendocrine cancer. Tumours were mostly locally advanced at the time of diagnosis. 3 patients' stage was 1b2, while 4 patients were 2b, 1 patient was 3c2r, and 1 patient was 4b. All tumours showed the immunohistochemical staining properties of neuroendocrine cancer. The main treatment modality applied to our patients was surgery + adjuvant CRT. The most used chemotherapeutic agents were cisplatin/carboplatin and etoposide. Recurrence was found in 3 cases, including 5 deaths., Conclusion: Neuroendocrine tumour of the cervix is a rare subtype with a poor prognosis. Unfortunately, there is not yet a standard treatment protocol due to the limited number of comparative studies of surgery, chemotherapy, and radiotherapy based treatment schemes., Competing Interests: The authors have no potential conflicts of interest with respect to the research, authorship, and/or publication of this article., (Copyright © 2021 Saliha Sağnıç et al.)
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- 2021
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46. Ciprofloxacin enhances phototoxicity of 5-aminolevulinic acid mediated photodynamic treatment for chordoma cell lines.
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Gull HH, Karadag C, Senger B, Sorg RV, Möller P, Mellert K, Steiger HJ, Hänggi D, and Cornelius JF
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- Aminolevulinic Acid pharmacology, Cell Line, Tumor, Cell Survival, Ciprofloxacin pharmacology, Humans, Photosensitizing Agents pharmacology, Chordoma drug therapy, Photochemotherapy methods
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Background: Chordoma are uncommon aggressive tumors of the skeleton. Surgical resection is often subtotal and adjuvant treatment possibilities are limited as chordomas are highly chemo- and radioresistant. In the present study we examined the impact of 5-ALA PDT on different human chordoma cell lines. Furthermore, we investigated the variation of two parameters: (1.) 5-ALA incubation time and (2.) supplemental use of ciprofloxacin as iron chelator., Methods: Experiments were realized in vitro with three different human chordoma cell lines: U-CH2, U-CH2B and U-CH14. After pre-incubation for 24 h with various concentrations of ciprofloxacin (1.5 - 5.0 μg/ml), different amounts of 5-ALA (15 - 50 μg/ml) were applied to the cells either for a brief (4 h) or a long (6 h) incubation time. Subsequently cells were exposed to photodynamic radiation. Cell viability was exploited by WST-1 assay. Thus, for each of the three cell lines, two drug combinations (ciprofloxacin plus 5-ALA and 5-ALA only) and two incubation times (short, 4 h and long, 6 h) were tested. Negative control groups were also examined., Results: Supplemental use of ciprofloxacin led to increased cell death in each of the cell lines. Different 5-ALA incubation times (4 h vs. 6 h) showed no significant differences in cell viability except for U-CH2., Conclusion: Ciprofloxacin as an ordinary applied antibiotic, enhanced the effect of 5-ALA PDT on different human chordoma cell lines in vitro. The impact was dependent on the dose of ciprofloxacin-5-ALA. There were no notable differences for the tested 5-ALA incubation times. In human chordoma cell lines 5-ALA PDT may effectively be amended by ciprofloxacin., (Copyright © 2021 Elsevier B.V. All rights reserved.)
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- 2021
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47. MTT Heterogeneity in Perfusion CT Imaging as a Predictor of Outcome after Aneurysmal SAH.
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Hofmann BB, Fischer I, Engel A, Jannusch K, Donaldson DM, Karadag C, van Lieshout JH, Beseoglu K, Muhammad S, Turowski B, Hänggi D, Kamp MA, and Rubbert C
- Subjects
- Female, Humans, Male, Perfusion, Retrospective Studies, Tomography, X-Ray Computed, Brain Ischemia diagnostic imaging, Subarachnoid Hemorrhage diagnostic imaging
- Abstract
Background and Purpose: Impairment of tissue oxygenation caused by inhomogeneous microscopic blood flow distribution, the so-called capillary transit time heterogeneity, is thought to contribute to delayed cerebral ischemia after aneurysmal SAH but has so far not been systematically evaluated in patients. We hypothesized that heterogeneity of the MTT, derived from CTP parameters, would give insight into the clinical course of patients with aneurysmal SAH and may identify patients at risk of poor outcome., Materials and Methods: We retrospectively analyzed the heterogeneity of the MTT using the coefficient of variation in CTP scans from 132 patients. A multivariable logistic regression model was used to model the dichotomized mRS outcome. Linear regression was used to eliminate variables with high linear dependence. T tests were used to compare the means of 2 groups. Furthermore, the time of the maximum coefficient of variation for MTT after bleeding was evaluated for correlation with the mRS after 6 months., Results: On average, each patient underwent 5.3 CTP scans during his or her stay. Patients with high coefficient of variation for MTT presented more often with higher modified Fisher ( P = .011) and World Federation of Neurosurgical Societies grades ( P = .014). A high coefficient of variation for MTT at days 3-21 after aneurysmal SAH correlated significantly with a worse mRS score after 6 months ( P = .016). We found no correlation between the time of the maximum coefficient of variation for MTT after bleeding and the patients' outcomes after 6 months ( P = .203)., Conclusions: Heterogeneity of MTT in CTP after aneurysmal SAH correlates with the patients' outcomes. Because the findings are in line with the pathophysiologic concept of the capillary transit time heterogeneity, future studies should seek to verify the coefficient of variation for MTT as a potential imaging biomarker for outcome., (© 2021 by American Journal of Neuroradiology.)
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- 2021
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48. Risk factors that increase recurrence in borderline ovarian cancers.
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Birge O, Bakır MS, Karadag C, Dinc C, Doğan S, Tuncer HA, and Simsek T
- Abstract
Objective: In this study, we aimed to compare the clinical and pathological results of borderline ovarian tumor cases that were operated on in our clinic within the last 15 years and to investigate the factors affecting recurrence., Materials and Methods: The archived files of the patients with borderline ovarian tumors, who had been operated on at the Akdeniz University Medical Faculty Gynecological Oncology Unit between 2006 and 2020 were retrospectively reviewed. A total of 48 cases were identified and included in the study. Oncological results affecting relapse were evaluated using univariate and multivariate analysis models. Disease-free survival was assessed using the Kaplan-Meier method., Results: The median follow-up period of the 48 patients included in our study was 51.5 months and while the shortest follow-up was 2 months, the longest follow-up period was 164 months. The mean age of the patients was 47.6 ± 12.5 years, and the mean BMI was found to be 27.2 ± 3.7. Of the patients, 19 (39.6%) were post-menopausal, and when all stages were included, the 10-year progression free survival (PFS) was 65%, while the 10-year overall survival (OS) was 96.6%. It was observed that 8 (16.6%) patients encountered recurrence during their follow-up. The multivariate analysis of significance found for the operation type, adjuvant chemotherapy and micro-invasion in the univariate analysis of clinical pathological characteristics with regard to recurrence, fertility-sparing surgery and micro-invasion were determined to have a significant difference in recurrence (p: 0,016, p: 0,048)., Conclusion: Borderline ovarian tumors are especially seen in young patients and although their clinical prognosis is very good, a significant difference was found in recurrence in patients who had undergone fertility-sparing surgery, in whom the micro-invasion was positive and in those receiving adjuvant chemotherapy, and disease-free survival was shorter in these patients and close follow-up of these patients is recommended., Competing Interests: None., (AJTR Copyright © 2021.)
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- 2021
49. Bevacizumab in recurrent ovarian cancer.
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Sait Bakir M, Birge O, Karadag C, Ilhan Y, Aykut Tuncer H, Sezgin Göksu S, and Simsek T
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- Aged, Antineoplastic Agents, Immunological economics, Bevacizumab economics, Carcinoma, Ovarian Epithelial mortality, Cost-Benefit Analysis, Female, Humans, Middle Aged, Neoplasm Recurrence, Local mortality, Ovarian Neoplasms mortality, Retrospective Studies, Survival Rate, Antineoplastic Agents, Immunological therapeutic use, Bevacizumab therapeutic use, Carcinoma, Ovarian Epithelial drug therapy, Neoplasm Recurrence, Local drug therapy, Ovarian Neoplasms drug therapy
- Abstract
Purpose: The cost-effectiveness of bevacizumab has been the subject of debate, and we aimed to present our own retrospective data on its effect on survival in recurrent epithelial ovarian cancer., Methods: Patients with recurrent ovarian, tubal and primary peritoneal cancer between October 2007 and June 2018 were grouped according to the platinum-free interval. The progression-free and overall survivals of the patients who had received chemotherapy only and chemotherapy with bevacizumab were calculated., Results: Eighty patients had received chemotherapy (CT) only, and 65 had received CT+BV. In platinum-sensitive recurrent epithelial ovarian cancer (PSREOC) patients, the median progression-free survival (PFS) months was 7 months (95% CI; 5.5-8.4) in the group who had received CT only and 13 months (95% CI; 5.8-20.1) in the group who had received CT+BV (p=0.001) and for CT+BV HR (Hazard Ratio):0.39 (95% CI; 0.24-0.64) (p=0.001). The median PFS of platinum-resistant recurrent epithelial ovarian cancer (PRREOC) patients who had received CT only was determined as 2 (95% CI; 1.4-2.5) and as 10 (95% CI; 6.8-13.1) months for patients who had received CT+BV (p=0.001), for patients who had received CT+BV HR: 0.31 (95% CI; 0.17-0.58) (p=0.001). In both PSREOC and PRREOC patients, there was no difference between CT + BV and CT group in terms of overall survival (p=0.978 and p=0.738, respectively)., Conclusion: A significant effect of bevacizumab on the progression-free survival of both platinum-sensitive and platinum resistant recurrent ovarian cancers has been demonstrated; however, this effect failed to impact overall survival. Therefore, it could be recommended to use bevacizumab, considering the cost-effectiveness in undeveloped and developing countries.
- Published
- 2021
50. The banality of head injury in The Punisher.
- Author
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Donaldson DM, Holtmann H, Nitschke J, Karadag C, Bostelmann R, Hartung B, Li L, and Petridis AK
- Published
- 2021
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