Browsing by Author "Demir, M."

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Approaches in the Treatment of Urethral Strictures
(Yuzuncu Yil Universitesi Tip Fakultesi, 2019) Demir, M.; Taken, K.
Urethral strictures are defined as the narrowing of the anterior urethral lumen or as corpus spongiosum fibrosis. Anterior urethral strictures can be divided as iatrogenic, inflammatory, idiopathic, and traumatic based on their etiology. Lower urinary tract septomas develop as a result of this disease. Many complications may occur in untreated patients.Cystoscopy, retrograde urethrography and ultrasonography can be used to diagnose the disease.Treatment methods are endoscopic and open surgery.Endoscopic treatment methods include dilatation, cold knife and laser internal uretrotomy. Recurrent bulbar urethral strictures; ”End-to-end anastomosis urethroplasty“ technique for short stenosis shorter than 2 cm. The technique of like ogmented anastomosis urethroplasty an with buccal graft is used for longer or complicated stenosis. © 2019, Yuzuncu Yil Universitesi Tip Fakultesi. All rights reserved.
Comparison of Focused and Unfocused Eswt in Treatment of Erectile Dysfunction
(Taylor and Francis Ltd., 2020) Eryilmaz, R.; Kaplan, Ş.; Aslan, R.; Demir, M.; Taken, K.
Recently, extracorporeal shock wave therapy (ESWT) is more commonly used in noninvasive treatment of erectile dysfunction (ED). There is no definitive treatment protocol on the use of ESWT. In this study, we aimed to compare focused and unfocused ESWT in ED. We created two groups, each including 20 patients with similar demographics. Focused ESWT is performed in one group, while unfocused ESWT is performed for the other group. Patients are assessed with IIEF-5 and EHS. Mean score of IIEF-5 was increased by 6.3 ± 3.3 (p <.05) from 9.6 ± 2.9 to 15.0 ± 5.0 in 3-month follow-up in the unfocused group. In the focused group, IIEF-5 score increased by 5.34 in average from 10.01 ± 2.5 to 15.4 ± 3.1. In conclusion, IIEF-5 score was significantly higher in the unfocused ESWT group than the focused ESWT group. © 2019 Informa UK Limited, trading as Taylor & Francis Group.
Could Bladder Wall Elastography Be Used as an Indicator for the Diagnosys of Bladder Outlet Obstruction by Benign Prostate Hyperplasia
(Yuzuncu Yil Universitesi Tip Fakultesi, 2020) Eryılmaz, R.; Aslan, R.; Arslan, H.; Demir, M.; Türkoğlu, S.; Araz, Ş.; Taken, K.
Benign prostatic hyperplasia (BPH) is one of the most common causes of bladder outlet obstruction in men. In this study we aimed to evaluate the elasticity of the bladder by Acoustic Radiation Force Impulse (ARFI) elastography in BPH patients. Fifty benign prostate patients were included in the study. After evaluation of patients in the outpatient clinic. A RFI elastography was performed with full bladder. Elastography was performed separately on the anterior, right and left walls of the bladder. Then the patient underwent uroflowmetry. The maximum flow rate and post-mix residual values in uroflowmetry were recorded. The mean age of the patients was 45.6 ± 3.77 The average of bladder anterior wall elasticity 3.39 ± 0.89, Bladder left wall elasticity 2,69 ± 0,82 and Bladder right wall elasticity was 3.69 ± 0.89.The mean prostate size 52.58 ± 24.16 The average of Qmax11.96 ± 4.85 The mean of PMR 77.8 ± 59.6 and mean of prostate elasticity was 2.97 ± 1.1 Urinary bladder wall elasticity with ARFI can be a diagnostic indicator for bladder outlet obstruction due to BPH. © 2020, Yuzuncu Yil Universitesi Tip Fakultesi. All rights reserved.
The Distribution and Habitat of Calomera Littoralis Mandli (Mandl, 1967) (Coleoptera: Cicindelidae) on the Coastal Margin of Lake Van in Turkey
(2006) Özgökçe, M.S.; Atlihan, R.; Kasap, İ.; Özgökçe, F.; Yıldız, Ş.; Demir, M.; Polat, E.
The tiger beetle Calomera littoralis mandli was found at Lake Van in eastern Anatolia at 20 out of 47 localities surveyed during 2004–2005. It occurs in open habitats with fine sand mixed with clay or in salt-marshes and with little plant cover. Three groups of larval burrows were determined, with average openings of 1.54 mm, 2.46 mm and 3.80 mm. These correspond to the 1st, 2nd and 3rd larval instars. © 2006 Taylor & Francis Group, LLC.
Evaluation of Renal Colic Patients Attending the Emergency Department When the Covid 19 Pandemic Was First Announcement
(Yuzuncu Yil Universitesi Tip Fakultesi, 2022) Ertaş, K.; Gizli, G.; Demir, M.; Sevim, M.; Eryılmaz, R.; Aslan, R.; Taken, K.
Renal colic cases, which have an important place among patients presenting to the emergency department with pain complaints, have an important place in urological emergencies. In this study, patients who applied to the emergency department with suspected renal colic diagnosis during the Covid-19 pandemic were compared with those in the pre-pandemic period. Patients who applied to the Emergency Department with the colic type flank pain between March 2020 and May 2020 were included in the study. Diagnostic and treatment parameters of 1699 patients, inclu ding 199 pandemic and 1500 pre-pandemic control group, were evaluated in this study. As a result of the evaluation made, it was seen that emergency physicians preferred ultrasonography less during the pandemic period, and mostly resorted to computer tomography method, and in this period, a decrease in the rate of observed kidney stones, an increase ureter stones were observed. During the pandemic period, there has been a considerable decrease in the rate of hospital admissions As a result of postponing treatment of patients with urinary system stones, secondary pyonephrosis and pyelonephritis rates increased approximately 10 times compared to the pre-pandemic period. © 2022, Yuzuncu Yil Universitesi Tip Fakultesi. All rights reserved.
Feature Selection With the Whale Optimization Algorithm and Artificial Neural Network
(Institute of Electrical and Electronics Engineers Inc., 2017) Canayaz, M.; Demir, M.
Feature selection is addressed an important problem in data mining. To be high dimension of the data obtained from the sources is encountered as an issue in many issues such as computation cost. For this reason, eliminating the unnecessary ones among these data and choosing the appropriate ones makes it possible to evaluate the information correctly. In this study, it is tried to suggest a method that can be used in feature selection on data sets. In this method, The Whale Optimization Algorithm, which is one of the new meta-heuristic algorithms, is used to select appropriate features. Training with artificial neural networks takes place during the evaluation process of selected features. At the end of the training, the features that provide the minimum error value are selected. In the performance evaluation of the method, known data sets will be used and the results will be given in comparison with the Particle Swarm Optimization method. © 2017 IEEE.
Fluoroscopy Free Flexible Ureteroscopy: the Report of 248 Cases
(Yuzuncu Yil Universitesi Tip Fakultesi, 2023) Taken, K.; Eryilmaz, R.; Aslan, R.; Ertaş, K.; Demir, M.; Deniz, B.; Duran, A.M.
The goal of this study was to assess the results of 248 patients who underwent fluoroscopy-free retrograde intrarenal surgery. Between January 2017 and March 2020, 248 cases of retrograde intrarenal surgery (RIRS) were conducted using an access sheath and guidewire. Using ureteroscopy, two hydrophilic guide wires were inserted into the renal pelvis under direct eyesight (URS). When the ureter could not be entered with the 9.5 Fr URS, the ureter was first entered using the 7.5 Fr URS. Then, without flouroscopy, an access sheath was pushed u p to the proximal ureter while examining the opening with URS. When an access sheath could not be placed, a double J stent was implanted. The operation was repeated after 3 weeks. The procedure's success rate was determined by the absence of stones or the presence of leftover fragments smaller than 3 mm. The study included 161 (64.9%) male and 87 (35.1%) female patients with a mean age of 44.03 (± 16.04), (range 18-81) years. Mean stone size was 14.7 (± 3.7) mm. The mean operation time was 62.34 (± 8.2) minutes. Stone-free rate was 88.7% (n: 220). 28 of the patients had residual stone. Twenty patients (8%) had minor complications, including hematuria and fever and in 2 patients (0.8%) subcapsular hematoma was developed. Kidney stones can be treated successfully with minimal morbidity and mortality. The insertion of an access sheath under urs guidance is possible without the need of fluoroscopy. Patients and surgeons are exposed to less radiation as a result of this procedure. © 2023, Yuzuncu Yil Universitesi Tip Fakultesi. All rights reserved.
Is Accompanying Organ Damage Related With Mortality in Renal Trauma
(Yuzuncu Yil Universitesi Tip Fakultesi, 2018) Eryılmaz, R.; Demir, M.; Aslan, R.; Taken, K.
Our aim in this study was to retrospectively review the accompanying organ damage, treatment and follow-up processes of patients in our clinic who had had renal trauma within the last five years. 78 patients who were followed due to renal injury were retrospectively reviewed. The cases were evaluated in terms of age, sex, trauma mechanism, accompanying injuries, injury severity, hematuria, treatment type, blood transfusion, hospitalization duration and results. Of the 78 patients, renal injury was observed in 33 (42.3%) patients due to a motor vehicle accident and in 16 (20.5%) patients due to falling. Conservative treatment was applied for 77% (n=60) of the patients, while 23% (n=18) of the patients underwent nephrectomy. The most common intra-abdominal injury was observed as a hepatic injury in 18 (23%) patients. In our study, six (7.7%) of the 78 patients had died. Accompanying organ damage was observed in all patients who died, and all of them had high grade renal injury. Conservative treatment is still important today regardless of the severity of the renal trauma after providing hemodynamic stability. High-grade renal injury and accompanying organ damage are important risk factors in terms of mortality. © 2018, Yuzuncu Yil Universitesi Tip Fakultesi. All rights reserved.
A Novel Indicator for Erectile Dysfunction: S100a4
(Yuzuncu Yil Universitesi Tip Fakultesi, 2024) Demir, M.; Huyut, Z.; Huyut, M.T.; Ertaş, K.; Aslan, R.; Eryılmaz, R.; Taken, K.
This study aimed whether S100A4 would be useful in predicting Erectile Dysfunction (ED) and ED severity. This prospective study included 88 male volunteers aged 18-80 years. The control group consisted of 44 healthy patients and the diabetic group consisted of 44 patients with type-2 diabetes (T2DM). Age, body mass index, smoking status, hypertension status, International Index of Erectile Function 1-5 scores of all the volunteers were evaluated, and also glucose, HbA1c, cholesterol, testosterone, prolactin and S100A4 levels were measured in the serum samples. The relationships between S100A4 and erectile functions were investigated with appropriate statistical analyzes. The mean age of the T2DM group was 51.98 ±10.91 years, while the control group’s mean age was 53.77 ±12.46 years and there was no significant difference between them (p=0.31). Glucose, HbA1c, mean ED severity and S100A4 levels in the T2DM group were higher than in the control group, while testosterone level was lower than in the control (p≤0.05). In addition, it was found that S100A4 levels increased due to the increase in ED severity in both groups (p<0.001). In addition to ED severity, smoking and hypertension were seen as the factors that most affected S100A4. The results indicated that S100A4 may be a useful biomarker in determining ED and ED severity. © 2024, Yuzuncu Yil Universitesi Tip Fakultesi. All rights reserved.
A Rare Case of Fip1l1-Pdgfr Clonal Hypereosinophilia
(Pergamon-elsevier Science Ltd, 2018) Dogan, A.; Demircioglu, S.; Ekinci, O.; Kaskalan, C.; Gocuncu, S.; Demir, M.; Demir, C.
The Urinary System Infections Caused by Extended-Spectrum Escherichia Coli and Klebsiella Pneumoniae Strains
(Yuzuncu Yil Universitesi Tip Fakultesi, 2016) Taken, K.; Parlak, M.; Günes, M.; Ergün, M.; Eryılmaz, R.; Demir, M.; Gecit, I.
Production of β-Lactamase enzymes is an important mechanism of resistance in Gram-negative bacteria. The aim of this study was to investigate the relationship between the Extended-Spectrum β-Lactamase (ESBL)-positive Escherichia coli (E. coli) and Klebsiella pneumoniae (K. pneumoniae) strains isolated from the urine cultures and the underlying diseases and also to assess the antibiotic resistance. The bacteria were identified according to conventional methods including colony morphology, gram stains, oxidase test and biochemical tests (indole production, Triple Sugar Iron (TSI) agar, Simmon’s Citrate agar, Christensen’s Urea agar, and motility test medium). BD Phoenix automated system (Becton Dickinson, USA) was used for further identification of the bacteria that were identified as E. coli and K. pneumoniae and for assessing the resistance rates and ESBL production. A total of 401 E. coli and 58 K. pneumoniae strains were isolated from the urinary specimens. Of these, 159 (39.6%) of E. coli and 26 (44.8%) of K. pneumoniae strains were ESBL-positive. The most active antibiotics against ESBL-positive E. coli and K. pneumoniae strains were carbapenems. Underlying diseases were detected in a total of 148 ESBL-positive strains (80%), including 127 (79.8%) of E. coli and 21 (80.8%) of K. pneumoniae strains. Common underlying diseases were benign prostate hyperplasia (BPH), urolithiasis, neurogenic bladder, urethral stricture, vesicoureteral reflux (VUR), hypospadias, ureteropelvic junction (UPJ) obstruction, vesicointestinal fistula, and cystocele (p<0.05). In the treatment of urinary system infections, ESBL-positive E. coli and K. pneumoniae strains should be kept in mind and the underlying diseases should be studied and treated. © 2016, Yuzuncu Yil Universitesi Tip Fakultesi. All rights reserved.
Using Different Machine-Learning Algorithms To Predict Dissolved Oxygen Concentration in Rainbow Trout Farms
(Central Fisheries Research Institute, 2026) Karataş, B.; Çakmakçı, C.; Yücel, E.S.; Demir, M.; Şen, F.
Dissolved oxygen (DO) is a vital parameter in intensive rainbow trout aquaculture, directly influencing fish growth, health, and survival. As such, accurate monitoring and prediction of DO levels are crucial for ensuring sustainable and efficient aquaculture practices. This study assessed and compared the predictive performance of four machine learning algorithms Multivariate Adaptive Regression Splines (MARS), Random Forest (RF), Extreme Gradient Boosting (XGBoost), and Averaged Neural Networks (avNNet) in estimating DO concentrations based on a range of water quality parameters. A total of 120 samples were collected from 12 rainbow trout farms across Türkiye. The input variables included suspended solids, electrical conductivity, turbidity, nitrate, nitrite, ammonia, ammonium, orthophosphate, pH, water temperature, and total phosphorus. DO levels ranged between 8 and 15 mg/L. Model performance was evaluated using Mean Absolute Error (MAE), Root Mean Square Error (RMSE), Mean Absolute Percent Error (MAPE), and the coefficient of determination (R²). All models demonstrated strong predictive accuracy, with XGBoost achieving the best overall performance (MAE: 0.44, RMSE: 0.58, MAPE: 0.04, R²: 0.78), followed by RF, avNNet, and MARS. These findings highlight XGBoost as a robust predictor of dissolved oxygen levels in aquaculture systems, which may contribute to improving water quality management and increasing productivity in rainbow trout aquaculture. © 2026, Central Fisheries Research Institute. All rights reserved.