Person: KALKAN, SENAD
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KALKAN
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SENAD
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- PublicationOpen AccessComparison of Scoring Systems in Predicting Success of Percutaneous Nephrolithotomy(2019-01-01T00:00:00Z) AKÇAY, MUZAFFER; Tosun, Muhammed; GEVHER, FATİH; KALKAN, Senad; ERSÖZ, CEVPER; Kayali, Yunus; Tepeler, Abdulkadir; AKÇAY, MUZAFFER; TOSUN, MUHAMMED; GEVHER, FATİH; KALKAN, SENAD; ERSÖZ, CEVPER; KAYALI, YUNUSBackground: Scoring systems are useful to inform the patients about the success and complication rates of the operation prior the surgery. Aims: To determine the applicability of the popular scoring systems (Guy’s, stone size, tract length, obstruction, number of involved calices, and essence/stone density and Clinical Research Office of the Endourological Society) by means of examining preoperative data of patients treated with percutaneous nephrolithotomy. Study Design: Cross sectional study. Methods: We retrospectively reviewed files of the patients who had undergone percutaneous nephrolithotomy in our center between 2011 and 2015. Excluded from the study were patients aged <18 years, and those who were not assessed preoperatively with computed tomography. Preoperative computed tomography images of all patients were assessed by a single observer, and patients were graded based on three scoring system. Demographic data were analyzed along with perioperative data (operation, fluoroscopy, length of hospital stay, changes in hematocrit values, location, and number of access sites, stone-free and complication rates). Results: A total of 298 patients who had been treated with 300 procedures were enrolled into the study. Mean age, stone burden, number of stones, and density were 48.1±12.9 years, 663.5±442.8 mm2, 1.8±1.1 and 888.3±273 HU respectively. Scores of the cases based on Guy’s, stone size, tract length, obstruction, number of involved calices, and essence/stone density, and Clinical Research Office of the Endourological Society scoring system were calculated as 2, 7.6, and 222.1 points respectively. 81.6% of the patients were stonefree. Complications were detected in 30 (9.9%) patients. Based on receiver operating characteristic curve analysis a positive correlation was detected between success rate and scoring systems, i.e., Guy’s (p=<0.001, r=-0.309), stone size, tract length, obstruction, number of involved calices, and essence/stone density (p=<0.001, r=-0.295), and Clinical Research Office of the Endourological Society (p=<0.001, r=0.426). The Clinical Research Office of the Endourological Society scoring system had the highest predictive value. The sensitivity rates rates for Guy’s, Clinical Research Office of the Endourological Society and Stone scoring system were as 78.78%, 80% and 82.34% respectively. Conclusion: All of scoring systems predicted correctly the success of the percutaneous nephrolithotomy procedures. The Clinical Research Office of the Endourological Society scoring system had the highest predictive value. Keywords: Percutaneous nephrolitotomy, scoring methods, specificity and sensitivity, urinary calculi
- PublicationMetadata onlyA Modified Antegrade Stenting Technique for Laparoscopic Pyeloplasty in Infants and Children(2016-01-01) Kalkan, SENAD; Ersoz, CEVPER; ARMAGAN, Abdullah; TASCI, Ali Ihsan; SILAY, Mesrur Selcuk; KALKAN, SENAD; ERSÖZ, CEVPERObjective: There are 2 critical steps of stent placement during laparoscopic pyeloplasty (LP) in children. Introduction to the ureteropelvic junction and passing through the ureterovesical junction. We aimed at overcoming those 2 steps by creating a modified technique. Methods: Consecutive 27 children undergoing transperitoneal laparoscopic dismembered pyeloplasty by a single surgeon were prospectively enrolled into this study. The modifications of our technique are using an Amplatz dilator and a closed tip stent. Results: The mean age of the children was 6.7 (range 4 months-17 years). The mean time of stent insertion was 2.7 +/- 2.0 (2-6) min and the operative time was 128.3 +/- 17.6 (90-180) min. The mean number of days of hospital stay was 2.0 +/- 0.4 (1-3). After a mean follow-up period of 20.3 +/- 4.2 (14-30) months, no operative failure was detected. Conclusion: Our modified technique is a completion of the current armamentarium for stent placement during LP in infants and children. (C) 2016 S. Karger AG, Basel
- PublicationMetadata onlyPenile fraktüre eşlik eden komplet üretra rüptürü(2017-10-14T00:00:00Z) Tosun, Muhammed; Ersöz, Cevper; İlktaç, Abdullah; Kalkan, Senad; Doğan, Bayram; Kayalı, Yunus; Hamidli , Seyidali; ERSÖZ, CEVPER; İLKTAÇ, ABDULLAH; KALKAN, SENAD; DOĞAN, BAYRAM; AKÇAY, MUZAFFER
- PublicationMetadata onlyLIVING DONOR KIDNEY TRANSPLANTATION WITH VASCULAR ANOMALIES: EXPERIENCE OF BEZMIALEM VAKIF UNIVERSITY(2018-10-21) ERSÖZ, CEVPER; AYDOĞDU, İBRAHİM; KALKAN, SENAD; AKÇAKAYA, ADEM; ERSÖZ, CEVPER; AYDOĞDU, İBRAHİM; KALKAN, SENAD; AKÇAKAYA, ADEM
- PublicationOpen AccessRemoval of a retroperitoneal foreign body through single port laparoscopy using nephroscope(2017-09-01T00:00:00Z) Basibuyuk, Ismail; Tosun, Muhammed; KALKAN, Senad; Tepeler, Abdulkadir; TOSUN, MUHAMMED; KALKAN, SENADForeign bodies are rare and challenging issues leading to symptoms according to the location. Laparoscopy is a popular and minimally invasive method used for removal of foreign bodies in the abdominal cavity or retroperitoneum. We herein report a case with retroperitoneal foreign body that was removed through retroperitoneal single- port laparoscopy using nephroscope. To our knowledge this is the first case of removal of a retroperitoneal foreign body through single- port laparoscopy using nephroscope.
- PublicationOpen AccessHigh D-dimer levels are associated with prostate cancer(2020-05-01T00:00:00Z) KALKAN, Senad; Caliskan, Selahattin; KALKAN, SENADProstate cancer is one of the most common types of cancer among men in the world1 and a significant health problem in developed and developing countries2 . The association between cancer and hemostasis has been shown in several studies3 . The main risk factors for coagulation activation and thrombosis are aging and malignancy4 . The increased risk of thrombosis in cancer patients may be associated with high levels of coagulation markers (fibrinogen), and thrombogenesis markers (D-dimer) are likely evidence of this process5 . Fibrinogen is an acute-phase protein that is mainly synthesized by hepatocytes and converted into insoluble fibrin by activated thrombin. It is also an important indicator of the coagulation system6 . The plasma fibrinogen level increases in some circumstances, such as malignancy and systemic inflammation. D-dimer is a degradation product of fibrin which is produced by plasmin-induced fibrinolytic activity7 . It is a biomarker that indicates the activation of hemostasis and fibrinolysis. Elevated plasma levels may be associated with some scenarios such as cancer, pregnancy, infectious diseases, trauma, surgery, and venous thromboembolism. When fibrinogen levels are increased, they are deemed to be an unfavorable prognostic factor in some malignancies, such as those of the digestive system, gynecologic malignancies, urologic neoplasms, and soft tissue sarcomas6 . A high level of D-dimer is a prognostic factor associated with increased mortality risk in patients with brain tumors, lymphomas, breast, lung, stomach, colorectal, pancreatic, and prostate cancers7 . We investigated the levels of D-dimer and fibrinogen in patients with prostate cancer and benign prostate hyperplasia.
- PublicationMetadata onlyMesh related vesıcoperitoneal fistula presenting with urinary ascites. A case report.(2018-11-01) İLKTAÇ, ABDULLAH; ERSÖZ, CEVPER; DOĞAN, BAYRAM; KALKAN, SENAD; ERSÖZ, CEVPER; DOĞAN, BAYRAM; KALKAN, SENAD
- PublicationOpen AccessAssociation of intrinsic sphincter deficiency with urine flow acceleration measurement(2020-09-01T00:00:00Z) GÖKMEN KARASU, AYŞE FİLİZ; Aydin, Serdar; KALKAN, Senad; ERSÖZ, CEVPER; GÖKMEN KARASU, AYŞE FİLİZ; KALKAN, SENAD; ERSÖZ, CEVPERBackground Intrinsic sphincter deficiency (ISD) is associated with an inability to maintain mucosal coaptation either at rest or in the presence of stress resulting from damage to muscles or nerves that maintain tonus. The purpose of our trial was to determine the role of urodynamic measurements of flow such as maximum flow rate, flow time, and acceleration speed of flow to assess the urethral resistance on prediction of stress incontinence and ISD. Materials and Methods Our study was based on a retrospective analysis of urodynamic records of female patients performed for urinary incontinence. Mean flow rate, maximum flow rate, detrusor pressure at maximum flow, vesical pressure at maximum flow, maximum detrusor pressure, and flow rate at maximum detrusor pressure measurements were extracted from the voiding phase of urodynamic charts. The slope of the maximum flow was used to calculate acceleration of flow (Qacc). The urodynamic records of 142 women were reviewed and Qacc was measured. Results The mean age of the ISD group was 53.3 +/- 12.5 (24-78) and of the non-ISD group 53.7 +/- 12.5 (35-74). The mean Qacc (30.3 +/- 16.1 degrees [mL/s(2)]) in the ISD group was significantly higher than in the non-ISD group (21.6 +/- 9.6 degrees [mL/s(2)]). Urodynamic bladder capacity of the non-ISD group (432.3 +/- 90.4 mL) was higher than the ISD group (389.2 +/- 109) (P = .01). Conclusion The Valsalva leak point pressure and maximum urethral closure pressure measurements in assessing urethral function are not useful for predicting incontinence surgery failure. We demonstrated that Qacc is higher in ISD stress incontinent women than stress incontinent women. Qacc may demonstrate urethral resistance and tonus in a more reliable manner.
- PublicationMetadata onlyTam Üretral Rüptüre Eşlik Eden Penil Kırıkların Cerrahi Tedavisi(2022-02-01T00:00:00Z) Ersöz, Cevper; İlktaç, Abdullah; Çolakoğlu, Yunus; Şimşek, Abdulmuttalip; Kalkan, Senad; ERSÖZ, CEVPER; İLKTAÇ, ABDULLAH; KALKAN, SENAD
- PublicationMetadata onlyLokalize Prostat Kanserinde Kalıcı Brakiterapi Deneyimimiz(2020-03-01T00:00:00Z) İlktaç, Abdullah; Kalkan, Senad; İLKTAÇ, ABDULLAH; KALKAN, SENAD
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