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Öğe Apelin has inhibitory effect of endothelium-independent relaxation in the human internal mammary artery(2019) Kacar, Emine; Burma, Oktay; Serhatlioglu, Ihsan; Ulker, Nazife; Uysal, Ayhan; Yardimci, Ahmet; Kelestimur, HalukAim: Apelin has important effects on the circulatory system and heart. The main aim of this study was to investigate the effects of apelin-13 on the contraction induced by norepinephrine (NE), and the endothelium-independent relaxation induced by sodium nitroprusside (SNP) in human internal mammary artery (IMA) obtained from patients undergoing coronary artery bypass grafting (CABG) surgery. Material and Methods: IMA rings, obtained from patients undergoing CABG surgery, were suspended in isolated tissue baths containing Krebs-Henseleit solution, which were continuously gassed with 95% O2 and 5% CO2 at 37°C. Results: The IMA rings were pre-contracted with increasing concentrations of norepinephrine (NE 10-9–10-4 mol/l) and the endothelium-independent relaxation responses to sodium nitroprusside (SNP) were studied. Apelin-13 (10 μM) caused a dosedependent relaxation in NE pre-contracted IMA rings. Apelin also facilitated the endothelium-independent relaxation induced by SNP. Conclusion: According to the results, apelin facilitated the endothelium-independent relaxation and inhibited the contractile activity of IMA. These results suggest that apelin may be a physiological agent against the deterioration of vascular elasticity caused by endothelial damage especially in atherosclerotic cardiac patients and hypertensive patients.Öğe Derin ven trombozu sonrası asemptomatik pulmoner emboli tanısında ventilasyon/ perfüzyon sintigrafisi ve multidedektör bilgisayarlı tomografinin karşılaştırılması(2014) Yücedağ, Eflatun; Uysal, Ayhan; Burma, Oktay; Özgüler, İbrahim Murat; Çolak, Mehmet Cengiz; Ansal Balcı, TanselÖz: Amaç: Pulmoner tromboemboli (PTE) sistemik venöz sistemde oluşan pıhtıların pulmoner vasküler yatağa göçü ile ortaya çıkan klinik tabloya verilen isimdir. Akut derin ven trombozu (DVT) sonrası ortalama %40-60 oranında asemptomatik PTE görülmekte ve bu durum sessiz klinik seyir nedeniyle fark edilmemektedir. Bu çalışmamızda akut alt ekstremite DVTsine bağlı gelişen asemptomatik PTE tanısında hala günümüzde önemli bir yer tutan ventilasyon-perfüzyon (V/P) sintigrafisi ile son yıllarda kullanılmaya başlanan multi-detektor bilgisayarlı tomografinin (MDBT) sensitivite ve spesifitesini karşılaştırmayı amaçladık. Yöntemler: Çalışma alt ekstremite akut DVT nedeniyle kliniğimize yatırılarak tedavisi planlanan 25 hastada ger- çekleştirildi. Gebeler, nüks DVT vakaları, müracaat esnasında semptomatik PTE tablosu olanlar, vena kavaya uzanım gösteren trombüsü olanlar, önceden geçirilmiş PTE öyküsü olanlar çalışmaya dahil edilmedi. Hastalarda DVT tanısı renkli doppler USG ile konulup, D-dimer testiyle teyit edildi. Hastalara yatışının 1.ve 8. günlerinde V/P sintigrafisi ve MDBT yapılarak asemptomatik PTE varlığı araştırıldı. Bulgular: Pulmoner tromboemboli açısından asemptomatik olan 25 DVT hastasının 24ünde D-dimer normalin üstünde ölçüldü. MDBT ile 10 hastaya PTE tanısı konuldu. Akut DVTye bağlı %40 oranında asemptomatik PTE geliştiği tespit edildi. Sonuç: Multi-detektor bilgisayarlı tomografi tanı değeri açısından V/P sintigrafisinden daha faydalı bulundu.Öğe Immunohistochemical evaluation of the effects of nebivolol on intimal hyperplasia following endothelial injury(Tubitak Scientific & Technological Research Council Turkey, 2011) Akar, Ilker; Rahman, Ali; Colak, M. Cengiz; Ustundag, Bilal; Ozercan, Ibrahim Hanifi; Uysal, AyhanAim: Intimal hyperplasia is a vascular remodeling process. It is a clinical problem that forms in the vascular wall as a result of smooth muscle cell migration, proliferation, and extracellular matrix accumulation. In this study we examined the immunohistochemical evaluation of the effects of nebivolol on intimal hyperplasia in damaged endothelial tissue. Materials and methods: The study was conducted using 21 rabbits equally divided into 3 groups: control, solvent, and nebivolol. The rabbits in the control group only underwent balloon injury of the abdominal aorta. The rabbits in the solvent group and nebivolol group underwent balloon injury and were treated with solvent and nebivolol intraperitoneally during the study. At the end of the study, the abdominal aortas were harvested. The intimal and medial areas were measured and the intima/media ratios were calculated. Tissue nitric oxide levels were determined and immunohistochemical findings were evaluated. Results: Statistically there were no differences between the control and solvent groups with respect to the intimal and medial areas, intima/media ratios, or the tissue nitric oxide (NO) levels. The neointimal thickening was significantly less in the nebivolol group than in the control and solvent groups (P < 0.001). Intima/media ratio was decreased in the nebivolol group (P < 0.001). Tissue nitric oxide levels were greater in the nebivolol group than in the control and solvent groups (P < 0.01). Immunohistochemical data in the nebivolol group were significantly lower as compared with the other groups (P < 0.05). Conclusion: Nebivolol may be a useful agent in early restenosis after vascular reconstructive procedures.Öğe Perioperative High-Dose Amiodarone Elevates Nitric Oxide Levels in Patients Undergoing Coronary Artery Bypass Surgery.(Allied Acad, 2013) Uysal, Ayhan; Azak, Soner; Colak, M. Cengiz; Burma, Oktay; Ozguler, I. Murat; Ustundag, Bilal; Bayar, Mustafa KemalThe aim of the current study was to assess the effects of the Class III antiarrhythmic drug amiodarone on arterial blood Nitric oxide (NO) levels together with malondialdehyde (MDA), superoxide dismutase (SOD), glutathione peroxidase (GSH-px), and catalase (CAT) levels in patients undergoing coronary artery bypass surgery (CABG). Twenty patients undergoing CABG were included in the study. The patients were divided into control and amiodarone groups (n=10 in each group). The patients in group 1 did not receive any drugs. The patients in group II received 4X400 mg/day amiodarone on the day before surgery, 2X600 mg/day amiodarone on the day of surgery, and 2X400 mg/day amiodarone for the first consecutive four days after the surgery. NO, MDA, SOD, GSH-px, and CAT values were measured for biochemical evaluation of oxidative stress before the induction of anesthesia (T-A), before CPB (T-CPB), five minutes after the clamp was removed (T-c), after protamine (T-P), and on postoperative days 1 (T-1), 3 (T-3), and 5 (T-5). Hemodynamic changes of all patients were recorded at before the induction of anesthesia (TA), before CPB (TCPB), after protamine (T-P), and on postoperative day 1 (T1). Amiodarone elevated NO levels at all times during the study period but did not cause changes in MDA, SOD, GSH-px, or CAT. In addition, amiodarone decreased mean pulmonary artery pressure, pulmonary capillary wedge pressure, and heart rate in these patients. No side effect due to drug was observed. Heart rate was found more decreased in amiodarone group at T-1 and T-2 stages when compared with controls (p<0.05). Perioperative high- dose amiodarone might be beneficial for patients who are pulmonary hypertensive and are undergoing CABG.Öğe Relationship of vitamin D level, fasting blood sugar, and body mass index, to carpal tunnel syndrome severity(2021) Guntel, Murat; Uysal, AyhanAim: This study aims to investigate the relationship between Idiopathic Carpal Tunnel Syndrome (CTS) and Vitamin D Level, Body Mass Index (BMI), and Fasting Blood Sugar.Materials and Methods: 54 CTS patients diagnosed electrophysiologically were included in the study. These patients' ages, genders, height and body weights, and body mass index values were recorded. Laboratory tests including vitamin D levels and fasting blood sugars were performed for each participant. The CTS stage was determined electrophysiologically and the Boston questionnaire and the visual analogue scale (VAS) were filled to assess total pain scores, symptom severities (CNS), and functional states (FSS).Results: There was a statistically significant difference between the distribution of CTS stages in female patients and male patients (p = 0.008). There was no statistically significant difference between mild, moderate, and severe CTS stages in terms of age, body mass index, and fasting blood glucose (p = 0.459; p = 0.232; p = 0.413, respectively). There is a statistically significant difference between CTS stages in terms of vitamin D levels (p0.001). Vitamin D averages were observed to decline from mild to severe stages of CTS. According to the Boston Carpal Tunnel Syndrome functional status scale, it was determined that there is marginal statistical significance between the stages of CTS. It was observed that the mean functional status scale scores increased from the mild stage to the severe stage (p = 0.055). There was no statistically significant difference between mild, moderate, and severe CTS stages in terms of VAS pain and paresthesia scores and the Boston Carpal Tunnel Syndrome symptom severity scale (p = 0.340; p = 0.359; p = 0.250, respectively).Conclusion: We found a significant relationship between the vitamin D level and the CTS stage. According to Boston Carpal Tunnel Syndrome Questionnaire, we found that there is a marginal statistical significance between the stages of CTS.
