Person: KOÇ, MEHMET
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KOÇ
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MEHMET
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Publication Metadata only Waist circumference is associated with carotid intima media thickness in peritoneal dialysis patients(SPRINGER, 2013) VELİOĞLU, ARZU; Asicioglu, Ebru; Kahveci, Arzu; Arikan, Hakki; Koc, Mehmet; Tuglular, Serhan; Ozener, Cetin IshakAtherosclerosis is responsible for the high mortality rate in end-stage renal disease patients. Defining risk factors for atherosclerosis may lead to reduction in cardiovascular disease through modification of these factors. Peritoneal dialysis (PD) patients are subjected to high glucose loads on a daily basis, which results in considerable weight gain and an increase in waist circumference (WC). WC as an indicator of abdominal obesity is a risk factor for atherosclerosis in the general population. Carotid artery intima media thickness (CIMT) measurement is a reliable method for the detection of early atherosclerosis. The aim of this study was to investigate the relationship between WC and CIMT and to define risk factors associated with CIMT in PD patients. Fifty-five PD patients and 40 healthy controls were included. Atherosclerosis was assessed using measurement of CIMT. Fasting blood was collected for analysis. Anthropometric parameters (age, weight, BMI, and WC) were measured. Peritoneal dialysis patients had higher WC (93.9 +/- A 1.7 vs. 87.3 +/- A 1.2 cm, p < 0.05) and CIMT (0.70 +/- A 0.02 vs. 0.57 +/- A 0.01 mm, p < 0.01) than the control group. On univariate analysis, age, WC, plaque formation, and D/P creatinine were positively correlated with CIMT, whereas residual renal function, albumin, ultrafiltration volume, and D/D0 glucose were negatively correlated. On multivariate analysis, only age, WC, and plaque formation showed correlation (p < 0.001). Carotid artery intima media thickness is associated with age, plaque formation, and WC in PD patients. WC measurement is a simple, inexpensive, reproducible, and reliable method of evaluating atherosclerosis risk in PD patients and should be assessed at every visit. Appropriate counsel should be provided to patients with greater WC who are deemed to be at risk for atherosclerosis.Publication Metadata only Baseline carotid intima-media thickness is associated with cardiovascular morbidity and mortality in peritoneal dialysis patients(WILEY, 2021) VELİOĞLU, ARZU; Asicioglu, Ebru; Velioglu, Arzu; Arikan, Hakki; Koc, Mehmet; Tuglular, Serhan; Ozener, CetinCarotid intima-media thickness (CIMT) is an early marker of atherosclerosis and is increased in peritoneal dialysis (PD) patients. Association of CIMT with cardiovascular disease (CVD) or mortality is less clear. Fibroblast growth factor-23 (FGF-23) is a hormone associated with vascular calcification, atherosclerosis, and mortality in the hemodialysis population. We investigated whether baseline CIMT and FGF-23 are associated with CVD and mortality in PD patients. Fifty-five PD patients were included. CVD was defined as ischemic heart disease, stroke, or peripheral artery disease. Intact FGF-23 was measured in plasma. CIMT was measured by ultrasonography. Twenty-one patients developed CVD and 12 died over 47.1 +/- 33.8 months. Patients with CVD were older (55.9 +/- 10.5 vs. 42.5 +/- 12.9 years, P < .01), had lower albumin (3.8 +/- 0.5 vs. 4.2 +/- 0.3 g/dL, P < .01) and higher CIMT (0.87 +/- 0.22 vs. 0.61 +/- 0.11 mm, P < .01). Patients with mortality were also older (53.5 +/- 11.5 vs. 45.8 +/- 13.8 years, P = .05), had lower albumin (3.7 +/- 0.6 vs. 4.1 +/- 0.3 g/dL, P < .01), higher CRP (15.0 +/- 8.5 vs. 7.6 +/- 8.4 mg/L, P < .01) and CIMT (0.9 +/- 0.3 vs. 0.6 +/- 0.1 mm, P < .01). Albumin and CIMT were associated with CVD and CIMT > 0.75 mm was associated with cardiovascular mortality. FGF-23 did not show any correlations. CIMT at baseline is associated with CVD and mortality in PD patients.Publication Metadata only Peri̇ton di̇yali̇zi̇ hastasında leclerci̇a adecarboksi̇lata peri̇toni̇ti̇(2015-10-21) BARUTÇU ATAŞ, DİLEK; VELİOĞLU, ARZU; ARIKAN, İZZET HAKKI; KOÇ, MEHMET; TUĞLULAR, ZÜBEYDE SERHAN; AŞICIOĞLU, EBRU; BARUTÇU ATAŞ D., VELİOĞLU A., AŞICIOĞLU E., AYKENT M. B., ARIKAN İ. H., KOÇ M., TUĞLULAR Z. S., ÖZENER İ. Ç.Giriş: Peritonit, sürekli ayaktan periton diyalizinin (SAPD) en sık ve önemli komplikasyonudur. Leclercia adecarboksilata, Enterobactericea ailesinden gram negatif, hareketli bir basildir. Periton diyalizi (PD) ilişkili peritonitin çok nadir bir sebebidir. Olgu Sunumu: Kronik glomerulonefrite bağlı son dönem böbrek yetmezliği (SDBY) nedeniyle 12 yıldır SAPD tedavisi gören 72 yaşında kadın hasta ateş, bulantı, kusma, karın ağrısı ve diyalizatta bulanıklaşma şikayeti ile hastaneye başvurdu. Fizik muayenede kan basıncı 90/60 mm/Hg, ateş 38,8 C°, batında yaygın hassasiyet saptandı. Diyaliz sıvısında silme lökosit izlendi. Laboratuvar tetkiklerinde WBC 4.600/µL, CRP 135 mg/L (N: 0-5) ve prokalsitonin 63 ng/mL (N: 0-0.5) izlendi. Kan ve periton sıvısı kültürleri alındıktan sonra ampirik olarak intraperitoneal sefuroksim ve oral siprofloksasin başlandı. Ertesi gün hastada klinik kötüleşme oldu ve periton sıvısı kültüründe Acinetobacter Baumanii ve Leclercia Adecarboksilata üremesi bildirildi. Antibiyograma göre tedaviye intravenöz imipenem ile devam edildi. Klinik düzelme sağlandı, Diyalizat hücre sayısı tedavinin 5. gününde negatifleşti. 2 hafta sonra antibiyotik rezistansını önlemek için imipenem kesilerek intraperitoneal amikasin ve oral siprofloksasine geçildi. Toplam üç hafta süren antibiyotik tedavisi sonrası hasta tamamen iyileşti ve tekrarlayan kültürlerde üreme olmadı. PD katateri çekilmeyen hastanın takiplerinde relaps peritonit izlenmedi. Tartışma: Gram negatif mikroorganizmalarla ilişkili peritonitlerde mortalite daha yüksektir ve daha sık olarak PD kateterinin çıkarılması gerekmektedir. Leclercia Adecarboxilata tek başına ya da bizim hastamızda olduğu gibi polimikrobial infeksiyonların bir komponenti olarak izole edilebilir. Epidemiyolojisi tam olarak bilinmemekle birlikte hastaların çoğunluğu immunsupresiftir. Ancak Leclercia Adecarboksilatanın etken olduğu infeksiyonların çoğunluğu hayati tehdit oluşturmaz. Acinetobacter Baumanii gibi tehlikeli bir mikroorganizma ile birlikte üretilmesine rağmen uygun antibiyotik tedavisi ile başarılı bir sonuç alınmıştır.Publication Metadata only Determinants of hemoglobin variability in stable peritoneal dialysis patients(SPRINGER, 2014) VELİOĞLU, ARZU; Arikan, Hakki; Asicioglu, Ebru; Velioglu, Arzu; Nalcaci, Serdar; Birdal, Gurdal; Guler, Derya; Koc, Mehmet; Tuglular, Serhan; Ozener, CetinSignificant within-patient hemoglobin (Hb) level variability is well recognized in particularly hemodialysis patients. Several factors such as hospitalizations, intercurrent diseases and IV iron therapy are found to be related to Hb variability (Hb-var). In this observational study, we aimed to identify predictors and outcome of Hb-var in peritoneal dialysis (PD) patients without hospitalization, intercurrent disease and IV iron therapy during the study period. All patients were in the maintenance phase of short-acting erythropoiesis-stimulating agents (ESAs) therapy. The target range of Hb was 11-12 g/dL according to KDOQI Guidelines in 2007. The desired range of Hb was 11-12.5 g/dL. Patients' demographic and laboratory data were collected at baseline. Atherosclerotic disease was assessed using carotid intima-media thickness (CIMT). We assessed Hb variability with various methods using SD Hb(mean), SD Hb(range) and the velocity of Hb change. Hb deflect(positive), Hb deflect(negative), Hb values and ESA dosing were recorded monthly for 6 months. This study included 50 prevalent PD patients (mean age 46.9 +/- A 13.7 years, 25 women). The mean velocity of Hb change was negatively correlated with age and positively correlated with frequent ESA dose changes. Higher albumin and residual renal function (RRF) were also positively correlated with Hb deflect(positive). Patients with CIMT a parts per thousand yen0.7 cm had lower SD Hb range compared to CIMT < 0.7 cm. Cumulative survival was better in patients with Hb levels consistently a parts per thousand yen10 g/dL compared to patients who had Hb < 10 g/dL for at least 1 month. However, Hb-var was not associated with mortality. In PD patients without hospitalization, intercurrent disease(s) or IV iron therapy, young age, higher albumin or RRF and lower CIMT were associated with greater oscillations in response to ESA therapy. Careful and appropriate ESA dose changes considering these parameters could minimize Hb variability in these patients.Publication Metadata only Primr FSGS ve ikinci FSGShastalarında karaciğer yağlanmasının karşılaştırılması(2019-10-16) ARIKAN, İZZET HAKKI; AKÇAY, SEÇKİN; TUĞCU, MURAT; VELİOĞLU, ARZU; KOÇ, MEHMET; TUĞLULAR, ZÜBEYDE SERHAN; AŞICIOĞLU, EBRU; Erbatur N. H., ARIKAN İ. H., AKÇAY S., TUĞCU M., VELİOĞLU A., AŞICIOĞLU E., KOÇ M., TUĞLULAR Z. S., ÖZENER İ. Ç.Giriş: Fokal segmental glomerüloskleroz (FSGS) çeşitli etiyolojiler sonrasında oluşan, podosit hasarı ve renal kitlede azalmadan kaynaklanan, glomerüllerin bir kısmında (fokal) ve etkilenen glomerülün bir bölümünde (segmental) skleroz ile karakterize histolojik bir lezyondur. FSGS genel olarak primer ve ikincil alt gruplarına ayrılır. Bu alt grupların bazı ortak klinik ve patolojik özellikleri olsa da tedavileri ve prognozları farklıdır ve bu nedenle ayrımları önemlidir. Bu ayrımda en önemli basamak olan elektron mikroskopunun ülkemizde rutin olarak uygulanmaması nedeni ile primer ve ikincil FSGS ayrımı güç olabilmektedir. Non-alkolik yağlı karaciğer hastalığı (NAFLD) ve kronik böbrek hastalığı (KBH) ilişkisi de göz önüne alındığında NAFLD’in ikincil FSGS etiyolojisinde rol oynayabileceği hipotezi kurulmuştur. Bizim çalışmamızın amacı primer ve ikincil FSGS ayrımın zor olduğu durumlarda ve hemodinamik FSGS’nin bilinen nedenlerinin (obezite, uyku apnesi) gösterilemediği durumlarda, tanıya yönlendirme amacı ile ikincil FSGS ile NAFLD arasındaki ilişkiyi araştırmaktır. Yöntem: Çalışmaya Marmara Üniversitesi Eğitim Araştırma Hastanesi’nde 2004 ile 2018 yılları arasında nefroloji bölümünden takipli ve böbrek biyopsisi ile FSGS tanısı alan 73 hasta dahil edildi. 18 yaş altı, ailesel/genetik FSGS, Fabry hastalığı, Virüs ilişkili FSGS, ilaç ilişkili FSGS tanılı hastalar çalışmaya dahil edilmedi. Hastane arşivinden ve elektronik veri sisteminden hastaların demografik özellikleri ve laboratuvar verileri retrospektif olarak toplandı. Nefrotik sendromun tüm komponentlerinin olduğu ve bilinen ikincil bir neden olmayan hastalar primer FSGS, hipoalbüminemi ve ödemi olmayan diğer hastalar ikincil FSGS kabul edildi. Primer ve ikincil FSGS tanılı hastalar demografik, klinik, laboratuvar ve ultrason (USG) ile tanımlanan karaciğer yağlanması açısından karşılaştırıldı. Bulgular: Hastaların 46’sı (%63) erkek, 27’si (%37) kadındı. Hastaların 29’u (%39,7) primer FSGS, 44’ü (%60,3) ikincil FSGS olarak değerlendirildi. Primer FSGS tanılı 2 (%6,9) hastada hepatosteatoz saptandı, 27 hastada (%93,1) ise hepatosteatoz yoktu, ikincil FSGS tanılı 26 (%59,1) hastada hepatosteatoz saptandı, 18 hastada (%40,9) ise hepatosteatoz yoktu. İkincil FSGS tanılı hastalarda hepatosteatoz primer FSGS hastalarına göre daha sık olup anlamlı fark bulunmaktadır. (P<0,001) Sonuç: Çalışmamızda ikincil FSGS tanılı hastalarda karaciğer yağlanmasının, primer FSGS hastalarına göre daha sık görüldüğü bulunmuştur. Bu sonuç NAFLD KBH arasındaki ilişki de göze alındığında NAFLD’ın ikincil FSGS ile ilişkili olabileceğini desteklemektedir. Primer ve ikincil FSGS ayrımı hem elektron mikroskopuna ulaşım güçlüğü hem de bilinen bir biyomarker olmaması nedeni ile zorluğunu korumaktadır. Primer ve ikincil FSGS ayrımın zor olduğu durumlarda ve hemodinamik FSGS’nin bilinen nedenlerinin (obezite, uyku apnesi) gösterilemePublication Open Access Unusual presentation of peritonitis with persistent clear aspirate: a case report(2010-12) VELİOĞLU, ARZU; Asicioglu, Ebru; Kahveci, Arzu; Bakir, Elif Ari; Bulur, Atilla; Arikan, Hakki; Koc, Mehmet; Tuglular, Serhan; Ozener, CetinPublication Metadata only Fibroblast Growth Factor-23 Levels Are Associated With Uric Acid But Not Carotid Intima Media Thickness in Renal Transplant Recipients(ELSEVIER SCIENCE INC, 2014) VELİOĞLU, ARZU; Asicioglu, E.; Kahveci, A.; Arikan, H.; Koc, M.; Tuglular, S.; Ozener, C.Introduction. Cardiovascular disease (CVD) is the leading cause of mortality in chronic kidney disease (CKD) patients. Fibroblast growth factor-23 (FGF-23) is associated with atherosclerosis and cardiovascular mortality in CKD patients and healthy subjects. However, data in renal transplant recipients (RTR) are scarce. We aimed to determine factors associated with FGF-23 and to explore its relationship to atherosclerosis. Methods. Forty-six patients and 44 controls were included. FGF-23 was measured from plasma. Carotid intima media thickness (CIMT) was evaluated ultrasonographically. Results. Patients had higher waist circumference (WC; 92.2 +/- 14.9 vs 85.3 +/- 11.0 cm; P < .05), glucose (99.8 +/- 17.2 vs 90.3 +/- 6.5 mg/dL; P < .01), creatinine (1.43 +/- 0.6 vs 0.86 +/- 0.1 mg/dL; P < .01), triglyceride (160.4 +/- 58.9 vs 135.6 +/- 59.8 mg/dL; P < .05), white blood cells (WBC; 7938.6 +/- 2105.2 vs 6715.7 +/- 1807.5 WBC/mm(3); P < .01), ferritin (217.0 +/- 255.8 vs 108.3 +/- 142.4 ng/mL; P < .05), uric acid (6.5 +/- 1.6 vs 4.7 +/- 1.3 mg/dL; P < .01), C-reactive protein (CRP; 8.2 +/- 18.2 vs 5.3 +/- 7.9 mg/L; P < .01), parathyroid hormone (PTH; 89.7 +/- 59.2 vs 44.1 +/- 16.7 pg/mL; P < .01), and alkaline phosphatase (ALP; 162.5 +/- 86.6 vs 74.2 +/- 21.9 U/L; P < .01). FGF-23 was higher in patients (11.7 +/- 7.2 vs 9.6 +/- 6.8 pg/mL; P < .05). CIMT was similar (0.58 +/- 0.09 vs 0.57 +/- 0.1 mm; P > .05). WC, creatinine, and uric acid were positively correlated with FGF-23, whereas albumin showed negative correlation. On multivariate analysis only creatinine and uric acid were determinants of FGF-23. Conclusion. FGF-23 levels are associated with uric acid in RTR. Larger studies are needed to confirm this finding.Publication Metadata only Kronik böbrek hastalığı olan yaşlı hastalarda mortalite belirteci: Prognostik beslenme indeksi(2021-09-22) TUĞCU, MURAT; VELİOĞLU, ARZU; ARIKAN, İZZET HAKKI; KOÇ, MEHMET; BARUTÇU ATAŞ, DİLEK; TUĞLULAR, ZÜBEYDE SERHAN; AŞICIOĞLU, EBRU; BARUTÇU ATAŞ D., TUĞCU M., AŞICIOĞLU E., VELİOĞLU A., ARIKAN İ. H., KOÇ M., TUĞLULAR Z. S.Publication Metadata only Streptococcus bovis bacteremia related to colon adenoma in a chronic hemodialysis patient(WILEY-BLACKWELL PUBLISHING, INC, 2010) VELİOĞLU, ARZU; Kahveci, Arzu; Ari, Elif; Arikan, Hakki; Koc, Mehmet; Tuglular, Serhan; Ozener, CetinWe report the case of a 54-year-old hemodialysis patient who presented with recurrent fever due to Streptococcus bovis bacteremia related to colonic tubulovillous adenoma. Following polypectomy and broad-spectrum antibiotic therapy, the patient totally recovered. In this paper, we discussed the relation between S. bovis bacteremia, colonic adenomas, and hemodialysis. Awareness of this association is critical for early diagnosis and management.Publication Open Access Fibroblast Growth Factor-23 Levels Are Associated with Vascular Calcifications in Peritoneal Dialysis Patients(KARGER, 2013) VELİOĞLU, ARZU; Asicioglu, Ebru; Kahveci, Arzu; Arikan, Hakki; Koc, Mehmet; Tuglular, Serhan; Ozener, Cetin IshakBackground: The aim of the study was to assess the relationship between fibroblast growth factor-23 (FGF-23) and vascular calcifications (VC) in peritoneal dialysis (PD) patients. Methods: A cross-sectional study was performed in 55 PD patients who underwent pelvic X-ray to assess for VC. Patients with and without linear calcifications were recorded. Results: Fifteen patients (27.3%) had linear calcifications on pelvic X-ray. FGF-23 levels were higher in patients with VC (299.5 (30.4-2,410.0) vs. 74.4 (14.8-1,030) pg/ml, p < 0.01). Diabetic patients had lower FGF-23 values (43.2 (14.9-134.0) vs. 103.5 (14.8-2,410) pg/ml, p < 0.01). Patients with residual renal function (RRF) had lower FGF-23 levels (70.6 (14.8-513) vs. 179.5 (30.4-2,410) pg/ml, p = 0.06); however, this did not reach statistical significance. FGF-23 levels, age, creatinine, Ca, dialysis duration and HbA1c were positively correlated with VC, whereas RRF, Ca intake and ALP were negatively associated. Multivariate logistic analysis confirmed FGF-23 levels, age, dialysis duration and RRF to be associated with VC. Conclusions: FGF-23 levels are associated with VC in PD patients. Further studies are needed to clarify whether it is simply a marker or a potential factor. It may prove to be an important therapeutic target for VC management. (C) 2013 S. Karger AG, Basel