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Öğe Can calcium dobesilate be used safely for peripheral microvasculopathies that require neoangiogenesis?(Int Scientific Literature, Inc, 2013) Demirtas, Sinan; Caliskan, Ahmet; Guclu, Orkut; Yazici, Suleyman; Karahan, Oguz; Yavuz, Celal; Mavitas, BinaliBackground: Calcium dobesilate (CaD) is a member of the synthetic veno-active drug family. Only a small number of reports are available that describe the micro-angiogenic effects of CaD in the current literature. Material/Methods: The antiangiogenic potential of CaD was compared with bevacizumab (Bb), which is a potent angiogenesis inhibitor, in a chick chorioallantoic membrane model. Four different concentrations (10-7, 10-6, 10-5, and 10-4 M) of drug pellet were prepared for each drug. Changes in vessel formation were scored and compared for each drug according to the previous literature. Result: The antiangiogenic behavior of CaD was lower than Bb, despite the significant dose-dependent manner of escalation. The anti-angiogenic scores of CaD were determined as 0.20, 0.47, 0.66, 1.0 in 10-7, 10-6, 10-5, and 10-4 M concentrations, respectively (average score >0.5 was significant). Conclusions: According to the data obtained, this agent should be used carefully for cases in which angiogenesis plays an important role in healing.Öğe Can elevated prolidase activity predict the duration of ischemic exposure in different types of ischemia?(Baycinar Medical Publ-Baycinar Tibbi Yayincilik, 2013) Yavuz, Celal; Guclu, Orkut; Demirtas, Sinan; Karahan, Oguz; Yazici, Suleyman; Caliskan, Ahmet; Celik, YusufBackground: This study aims to determine the relationship between serum prolidase activity and ischemia duration in different ischemia types. Methods: Forty male Sprague Dawley rats were divided into five equal groups. The rats were sacrificed and blood samples were obtained to determine the basal serum prolidase levels in group 1 (control group) without any intervention. In groups 2 and 3, the superior mesenteric arteries were clamped with simple laparotomy to induce mesenteric ischemia. In groups 4 and 5, the right common femoral artery was clamped to induce peripheral ischemia and blood samples were taken at 120 and at 360 minutes, respectively. The serum prolidase levels were measured using the samples obtained from each group. Results: The basal prolidase level in rats was found to be 266.8 +/- 20.5 U/L. The serum prolidase levels increased after two-hours of peripheral (404.0 +/- 105.6 U/L) and mesenteric ischemia (317.1 +/- 121.4 U/L). However, the serum prolidase levels decreased after six-hours of peripheral (346.1 +/- 104.9 U/L) and mesenteric ischemia (233.4 +/- 36.6 U/L). Although the serum prolidase levels were elevated in the second hour of mesenteric ischemia, they were lower than the enzyme levels obtained after two-hours of peripheral ischemia (p=0.006). Conclusion: The serum prolidase level may be an important predictive biomarker for identifying the duration of ischemia.Öğe Diagnostic value of plasma C-type natriuretic peptide levels in determination of the duration of mesenteric ischaemia(Clinics Cardive Publ Pty Ltd, 2014) Demirtas, Sinan; Karahan, Oguz; Yazici, Suleyman; Guclu, Orkut; Caliskan, Ahmet; Tezcan, Orhan; Yavuz, CelalObjective: Mesenteric arteries release C-type natriuretic peptide (CNP), which hyperpolarises vascular smooth muscle. We measured the levels of this peptide after inducing mesenteric ischaemia over a series of time intervals, so as to determine its predictive value in demonstrating the severity of ischaemia in a rat model. Methods: A total of 32 rats were allocated to four groups containing eight rats each. Basal CNP reference levels were measured in the control group, which was not exposed to any intervention. In groups I, II and III, mesenteric ischaemia was induced over three, six and nine hours, respectively, and plasma CNP levels were measured afterwards. Mesenteric ischaemia was induced by clamping the superior mesenteric artery. Results: In comparison with the controls (2.38 +/- 0.18 pg/ml), CNP levels were relatively lower in group I (2.54 +/- 0.42 pg/ml). However, significant increases in plasma CNP levels were observed over longer periods of ischaemia in group II, at 5.23 +/- 0.22 pg/ml, and in group III, at 6.19 +/- 0.67 pg/ml (p < 0.05). A significant direct relationship was determined between plasma CNP levels and prolonged intervals of mesenteric ischaemia (R = 0.56, p < 0.001). Conclusion: Measuring plasma CNP levels in patients with acute mesenteric ischaemia may be beneficial in estimating the time period over which the ischaemic injury has occurred.Öğe DIETARY ADDITION OF CAFFEIC ACID PHENETHYL ESTER PROTECTS MYOCARDIAL TISSUE AGAINST ETHAMBUTOL INDUCED OXIDATIVE STRESS(Nobel Ilac, 2013) Yavuz, Celal; Demirtas, Sinan; Yazici, Suleyman; Caliskan, Ahmet; Guclu, Orkut; Karahan, Oguz; Mavitas, BinaliObjective: The myocardial effect of ethambutol (ETM) has not yet been clarified. The main purpose of this study was to determine both the oxidative status in myocardial tissue after administration of ETM and the adjuvant benefits of caffeic acid phenethyl ester (CAPE). Material and Method: Twenty four male rats were divided into three experimental groups as follows: a control group (without any drug administration) was created for obtaining normal myocardial tissue; an ETM group (rats received only ETM for thirty days) was created for ethambutol administration; and an ETM+CAPE group was created for administration of the full regimen (rats received ETM+CAPE for thirty days). Rats were sacrified at the end of day 30 and heart tissues were obtained for histopathological and biochemical examination. Oxidant and antioxidant parameters were biochemically investigated in all tissue samples. Results: In the ETM group, myocardial malondialdehyde (MDA) levels and total oxidant status (TOS) were significantly higher than in the control group (p<0.001). Conversely, total antioxidant capacity (TAC), the activity of superoxide dismutase (SOD) and of serum paraoxonase (PON1) were reduced in the ETM group (p<0.05). Furthermore, MDA and TOS activity was significantly reduced in the ETM+CAPE group (p<0.05); TAC, SOD and PON1 activities were increased with adjuvant CAPE therapy (in the ETM+CAPE group) rather than in the ETM group. Conclusion: ETM may lead to increased myocardial oxidative stress due to lipid peroxidation. Nevertheless, adjuvant CAPE administration seems to provide a partial enhancement of myocardial damageÖğe Evaluating the anti-angiogenic properties of Iloprost and Dipyridamole in the chick embryo chorioallantoic membrane model(Allied Acad, 2014) Guclu, Orkut; Karahan, Oguz; Yazici, Suleyman; Caliskan, Ahmet; Demirtas, Sinan; Yavuz, Celal; Muratoglu, AbdurrahmanDipyridamole is an antithrombotic agent that is widely used in the treatment of many vascular disorders. Also, the prostacyclin analogue iloprost has been utilized to salvage limbs in patients with severe limb ischemia. In this study we investigated whether dipyridamole and iloprost have anti-angiogenic properties and their anti-angiogenic properties were compared to bevacizumab, a known inhibitor of angiogenesis, using the in vivo chick chorioallantoic membrane animal model. Agar pellets were prepared with three different drug concentrations at 10(-6) M, 10(-5) M, and 10(-4) M. For each drug concentration twenty fertilized eggs were used. The entire experiment was performed in duplicate. Blood vessel density and loss were examined and scored under a stereoscopic microscope. For the 10(-4) M, 10(-5) M and 10(-6) M concentrations, the anti-angiogenic scores of iloprost were 0.2, 0.1 and 0.05, respectively. In the same order, the anti-angiogenic scores for dipyridamole were 0.2, 0.3 and 0.8. The antiangiogenic scores for bevacizumab were significantly higher than dipyridamole and iloprost over all concentrations (p<0.05). There were no significant differences found between the anti-angiogenic scores for iloprost and dipyridamole for all concentrations (p>0.05). Iloprost demonstrated no anti-angiogenic properties in the chorioallantoic membrane animal model, while dipyridamole did exhibit very weak anti-angiogenic activity only at very high doses of 10(-4) M. These results reveal that both agents can be prescribed safely for the treatment of medical conditions that require angiogenesis to facilitate healing.Öğe Evaluation of Pericardial Fluid C-Type Natriuretic Peptide Levels in Patients Undergoing Coronary Bypass Surgery(Georg Thieme Verlag Kg, 2017) Guclu, Orkut; Karahan, Oguz; Karabacak, Mustafa; Yuksel, Volkan; Huseyin, Serhat; Mavitas, BinaliBackground Neurohumoral and hemodynamic mechanisms have an effect on cardiac activity. C-type natriuretic peptide (CNP) is accessible in the cardiovascular system. The aim of this study was to determine whether CNP concentrations in pericardial fluid and blood are related to cardiac dysfunction in patients undergoing coronary artery bypass graft surgery. Materials and Methods In this study, 40 patients undergoing coronary artery bypass grafting were enrolled. The patients were separated into two groups according to left ventricular (LV) ejection fraction (EF): group 1 contained 28 patients with normal LV systolic function (LVEF >= 50%) and group 2 contained 12 patients with impaired LV systolic function (LVEF < 45%). Plasma and pericardial fluid samples were acquired during surgery to measure CNP levels. Results In group 1, CNP levels were detected to be 0.46 +/- 0.10 ng/mL in plasma and 0.66 +/- 0.8 ng/mL in pericardial liquid. In group 2, these levels were 0.51 +/- 0.09 and 0.79 +/- 0.12 ng/mL, respectively. CNP levels were determined to be significantly higher in patients with low EF compared with those with normal EF in pericardial fluid concentrations (p = 0.013). Conclusions CNP level in pericardial fluid is a more sensitive and proper marker of LV dysfunction than CNP levels in plasma. To the best of our knowledge, this study is the first to examine pericardial fluid CNP levels in patients undergoing coronary artery bypass surgery. It may have a valuable role in organizing cardiac remodeling and hypertrophy.Öğe Evaluation of the Vasoplegic impact of Papaverine in the rat aorta(Pakistan Medical Assoc, 2014) Yavuz, Celal; Callskan, Ahmet; Karahan, Oguz; Demirtas, Sinan; Yazici, Suleyman; Guclu, Orkut; Donmez, SonerObjective: To identify the degree of vasoplegic affinity of papaverine to rat thoracic aortas following constriction caused by adrenalin, serotonin and potassium chloride in an in-vitro model. Methods: The in vitro vasoplegic efficacy of papaverine against adrenalin (10(-5) M), serotonin (5HT) (10(-4) M), and KCI (60 mM) was assessed, using a rat aortic vasospasm model in an organ bath. First, aortic rings were constricted with a submaximal dose of vasoconstrictor agents. The samples were then incubated with papaverine (3x10(-4) M) for 20 minutes, followed by readministration of the same vasoconstrictor agents. The first vasospastic response (before papaverine incubation) and the new vasoconstrictor responses (after papaverine incubation) of the vessels were then compared. Results: The vasoplegic effect of vasoconstrictor agents in decreasing order was observed as adrenalin>KCI>5HT. This different affinity for the vasoplegic effect is considered to be a temporary impact of the drugs and the maximal inhibition of vasoconstriction was detected for the adrenalin receptor. Conclusion: The relevance of the macromolecules is responsible for the permanent efficacy of the drugs. Different degrees of vasoconstriction were also obtained after papaverine administration, which suggests that different responses can occur as a result of different stimulation of receptor modulators.Öğe Factor-Xa inhibitors protect against systemic oxidant damage induced by peripheral-ischemia reperfusion(Springer, 2014) Caliskan, Ahmet; Yavuz, Celal; Karahan, Oguz; Yazici, Suleyman; Guclu, Orkut; Demirtas, Sinan; Mavitas, BinaliFactor-Xa inhibitors are often used for prophylaxis and for the treatment of thrombotic vascular disorders. However, it is not known whether they are beneficial during the recanalization of the thrombotic vascular segment and during tissue reperfusion. Herein, we describe an animal study that was designed to investigate the possible protective effects and antioxidant properties of factor-Xa inhibitors. Forty rats were included in the study and were randomly divided into five equal groups. The first group served as a control group from which we obtained basal oxidant and antioxidant parameters. Peripheral ischemia was induced in the second group (sham group) for 6 h, and plasma levels of nitrogen oxide (NOx), prolidase and malondialdehyde (MDA) were obtained after 30 min of reperfusion. The sham group did not receive any drugs. Oral rivaroxaban (3 mg/kg) was administrated to Group III, intraperitoneal enoxaparin sodium (250 U/kg) was administrated to Group IV, and intraperitoneal bemiparine sodium (250 U/kg) was administrated to Group V 1 week prior to the induction of peripheral ischemia (for 6 h)-reperfusion. After 30 min of reperfusion, blood samples were obtained and NOx, prolidase and MDA levels in these groups were detected, and the rats were sacrificed. NOx levels were statistically similar (p > 0.05) between Groups I, II, III, IV, and V (20.7 +/- A 10.4, 17.4 +/- A 9.7, 25.9 +/- A 24.2, 27.0 +/- A 11.9, 23.3 +/- A 17.3 mu mol/L, respectively). MDA levels were significantly lower (p < 0.05) in Groups III (rivaroxaban), IV (enoxaparin sodium), and V (bemiparine sodium) (24.9 +/- A 11.9, 25.9 +/- A 4.4, 25.4 +/- A 10.8 mu mol/L, respectively) when compared with the sham group (Group II) (75.6 +/- A 24.3 mu mol/L). Prolidase levels were higher (p > 0.05) in the ischemia reperfusion groups (659.2 +/- A 130.6 in II (sham), 1,741.0 +/- A 1,530.6 in III (rivaroxaban), 2,453.8 +/- A 1,590.4 in IV (enoxaparin sodium), and 889.2 +/- A 574.7 U/g in V (bemiparine sodium) than in the control group (144.6 +/- A 131.8 U/g). Ischemia-reperfusion events may occur in prothrombotic disorders. During these events, prophylactic or therapeutic factor-Xa inhibitors can protect against thrombosis and oxidative reperfusion injury. The new oral factor-Xa inhibitor, rivaroxaban, appears to provide the same antioxidant support as injectable low molecular weight heparins (LMWHs).Öğe Human ischemia modified albumin can be a predictive biomarker for the detection of peripheral ischemia duration(Drunpp-Sarajevo, 2012) Yavuz, Celal; Caliskan, Ahmet; Yazici, Suleyman; Karahan, Oguz; Guclu, Orkut; Demirtas, SinanBackground: Human ischemia modified albumin (IMA) provides diagnostic and prognostic information for acute coronary ischemia. However, its role in peripheral ischemic disorders is unclear. The aim of this study is to detect the association between ischemia duration and the discriminator value of serum IMA levels in rat model with created peripheral ischemia. Methods: Thirty-two male Sprague-Dawley rats were included in the study. The rats were divided into four equal groups. The rats in Group I were sacrificed to determine the basal serum values of IMA without any application. The rats in Group II, the sham group, were applied with simple femoral incision only. The rats in Group III and IV had their common femoral artery clamped with classic femoral incision. Blood samples were taken after 120 minutes of ischemia in Group III and after 360 minutes of ischemia in Group IV, respectively. The serum ischemia modified albumin levels were detected using the blood samples. The results were compared statistically. Results: Obtained IMA levels were similar in the sham (Group II) and baseline (Group I) groups (p>0.05). The serum IMA levels were determined as 33 +/- 4 (33) mu/L, 36 +/- 9 (34) mu/L and 57 +/- 19 (61) mu/L in Groups I, III and IV, respectively. High IMA levels were found in advanced ischemia duration. The increase in serum IMA levels with time was statistically significant as can be seen in Figure 1 (p<0.05). Conclusion: Peripheral ischemic disorders can cause extremity loss if not treated immediately. In addition, delayed treatments may have fatal results. Therefore, timing is important in such cases. We suggest that serum IMA levels may be beneficial for the determination of ischemia duration in peripheral ischemia. They may also improve the predictive values of other standard biomarkers of ischemia.Öğe Investigation of possible prophylactic, renoprotective, and cardioprotective effects of thromboprophylactic drugs against ischemia-reperfusion injury(Elsevier Taiwan, 2015) Demirtas, Sinan; Karahan, Oguz; Yazici, Suleyman; Guclu, Orkut; Caliskan, Ahmet; Tezcan, Orhan; Kaplan, IbrahimThe aim of this study was to investigate whether anticoagulant and antiaggregant agents have protective effects against oxidative damage induced by peripheral ischemia ereperfusion (I/R). Groups were created as follows: control group, I/R group (sham group), I/R plus acetylsalicylic acid (Group I), I/R+clopidogrel (Group II), I/R+rivaroxaban (Group III), I/R+bemiparin sodium (Group IV), and I/R+enoxaparin sodium (Group V). In Groups I, II, III, IV, and V, drugs were administered daily for 1 week before I/R creation. Peripheral I/R was induced in the I/R groups by clamping the right femoral artery. The rats were sacrificed 1 hour after reperfusion. Nitrogen oxide levels, malondialdehyde (MDA) levels, paraoxonase-1 (PON1) activity, and prolidase activity were evaluated in both cardiac and renal tissues. There was no significant difference in nitrogen oxide levels between the groups. However, cardiac and renal MDA were significantly higher and PON1 activity was markedly lower in the I/R groups compared with the control group (p < 0.05). Although elevated prolidase activity was detected in both the cardiac and renal tissue of the I/R groups, only the sham group and Group V had significantly higher renal prolidase activity (p < 0.05). Group V had significantly higher cardiac MDA, PON1, prolidase levels, and renal prolidase activity compared with the sham group (p < 0.05). Significant improvement in renal MDA levels was only observed in Group III, and marked improvement was observed in the cardiac MDA levels of Group II when compared with the sham group (p < 0.05). Thromboprophylactic agents appear to provide partial or prominent protection against I/R injury. Copyright (C) 2015, Kaohsiung Medical University. Published by Elsevier Taiwan LLC. All rights reserved.Öğe Investigation of the antiangiogenic behaviors of rivaroxaban and low molecular weight heparins(Lippincott Williams & Wilkins, 2014) Yavuz, Celal; Caliskan, Ahmet; Karahan, Oguz; Yazici, Suleyman; Guclu, Orkut; Demirtas, Sinan; Mavitas, BinaliAntithrombotic agents play important roles in the prophylactic and therapeutic management of many cardiovascular disorders. Therefore, many researchers have focused on developing new strategies for anticoagulation. New oral anticoagulants and factor Xa inhibitors are products of such research. Although they are identified as advantageous, there are limited data available about their multisystemic interactions. Thus, the antiangiogenic behaviors of oral factor Xa inhibitors and low molecular weight heparins (LMWHs) were investigated in this study. The chick chorioallantoic membrane (CAM) model was designed to investigate the antiangiogenic potential of new oral factor Xa inhibitors (rivaroxaban) and LMWHs (enoxaparin sodium and tinzaparin sodium). Four different molar concentrations (10(-4), 10(-5), 10(-6), and 10(-7) mu mol/l) were studied for each drug. Each concentration was studied on 20 fertilized eggs. Vessel structures were evaluated under a stereoscopic microscope, and vessel formation was scaled according to previous literature. Both enoxaparin and tinzaparin sodium have increased antiangiogenic efficacy on CAM in a dose-dependent manner. However, this increased efficacy did not reach significant levels (average score < 0.5). On the contrary, while rivaroxaban showed dose-dependent antiangiogenic properties similar to enoxaparin and tinzaparin, a significant average antiangiogenic score (0.7) was detected at 10(-4) mu mol/l concentrations. New oral anticoagulants seem to be more favorable. However, their safety for the cardiovascular system needs to be clarified through microsystem studies on, for example, angiogenesis.Öğe Multi-Genetic Origins of Phenotypic Markers of the Risk of Cardiovascular Disease(Hellenic Cardiological Soc, 2013) Guclu, Orkut; Yavuz, Celal; Karahan, Oguz[Abstract Not Available]Öğe Neutrophil gelatinase-associated lipocalin as a biomarker for acute kidney injury in patients undergoing coronary artery bypass grafting(Cardiology Academic Press, 2013) Demirtas, Sinan; Caliskan, Ahmet; Karahan, Oguz; Yavuz, Celal; Guclu, Orkut; Cayir, Mustafa Cagdas; Toktas, FarukBACKGROUND/OBJECTIVE: The development of acute renal injury (ARI) is an important indicator of clinical outcomes after cardiac surgery. Neutrophil gelatinase-associated lipocalin (NGAL) has been certified as a predictive biomarker of hypoxic ARI. The present study aimed to determine the predictive role of NGAL in coronary bypass graft (CABG) surgery. METHOD: A total of 72 consecutive patients undergoing elective CABG were enrolled in the study. NGAL levels were determined preoperatively and postoperatively after 6 h, 24 h and 72 h for all participants. The participants were then divided into two groups according to their preoperative creatinine levels (group I, creatinine 111.38 mu mol/L to 361.55 mu mol/L; group II, creatinine <111.38 mu mol/L). RESULTS: There was no statistically significant difference between the groups according to their NGAL values (P>0.05), except at 6 h (P=0.045). Three patients required continuous hemodialysis. Comparison of the NGAL levels of these three patients with those of the other participants did not reveal any correlation with serum creatinine levels. In contrast, the NGAL levels were significantly lower in the continuous hemodialysis patients (1.9 +/- 1 ng/mL) compared with those of the other participants (22.6 +/- 12.8 ng/mL; P=0.001). CONCLUSION: NGAL is one of the most frequently used biomarkers for ARI after cardiac operations, especially in younger patients. The participants in the present study were coronary artery disease patients and were, therefore, older than patients in previous reports. These results support the view that NGAL is not a relevant predictive factor for ARI in patients with CABG, including older patients.Öğe Protective effects of ginseng extracts and common anti-aggregant drugs on ischaemia-reperfusion injury(Clinics Cardive Publ Pty Ltd, 2015) Caliskan, Ahmet; Karahan, Oguz; Yazici, Suleyman; Demirtas, Sinan; Guclu, Orkut; Tezcan, Orhan; Yavuz, CelalObjective: Ginseng is a traditional herbal medicinal product widely used for various types of diseases because of its cellular protective effects. Possible protective effects of ginseng were investigated in blood, cardiac and renal tissue samples and compared with common anti-aggregant agents in an animal ischaemia-reperfusion (I/R) model. Methods: Twenty rats were equally divided into four different groups as follows: control group (I/R-induced group without drug use), group I (acetylsalicylic acid-administered group), group II (clopidogrel bisulfate-administered group), group III (ginsenoside Rb-1-administered group). For the groups assigned to a medication, peripheral I/R was induced by clamping the femoral artery one week after initiation of the specified medication. After reperfusion was initiated, cardiac and renal tissues and blood samples were obtained from each rat with subsequent analysis of nitrogen oxide (NOx), malondialdehyde (MDA), paraoxonase 1 (PON1) and prolidase. Results: NOx levels were similar in each group. Significant decrements were observed in serum PON1 levels in each group when compared with the control (p < 0.05). Serum MDA levels were significantly lower in groups II and III (p < 0.05). Ameliorated renal prolidase levels were detected in study groups (p < 0.05) and recovered cardiac prolidase levels were obtained in groups II and III (p < 0.05). Conclusion: These findings indicate that ginseng extracts may have a potential beneficial effect in I/R injury. However, more comprehensive studies are required to clarify the hypothetical cardiac, renal and systemic protective effects in reperfusion-induced oxidative damage.Öğe The relationship between complete blood count parameters and Fontaine's Stages in patients with peripheral arterial disease(Sage Publications Ltd, 2014) Demirtas, Sinan; Karahan, Oguz; Yazici, Suleyman; Guclu, Orkut; Caliskan, Ahmet; Yavuz, Celal; Kucuker, AslihanObjective: The aim of the present study is to evaluate whether blood count parameters differ according to the stages of Fontaine's classification and to investigate the relationship between hemogram parameters and the severity of the disease. Method: Eighty-two peripheral arterial disease patients were examined prospectively. Patients were classified according to the Fontaine classification system. Fifty newly diagnosed patients were included in the study. The neutrophil-to-lymphocyte ratio, mean platelet volume, and red blood cell distribution width values were recorded. Results: Mean neutrophil-to-lymphocyte ratio values were found to be 3.31 +/- 1.1% in Stage I, 3.11 +/- 1.3% in Stage II, and 3.48 +/- 1.1% in Stage III (p > 0.05). Mean platelet volume values were found to be 7.8 +/- 0.6 fl (Stage I), 8.2 +/- 1.0 fl (Stage II), and 9.0 +/- 0.9 fl (Stage III) (p < 0.05). Red blood cell distribution width values were found to be 13.6 +/- 1.0% in Stage I, 14.8 +/- 1.7% in Stage II, and 15.4 +/- 2.3% in Stage III, being significantly different among all three stages (p < 0.05). Conclusion: Both red blood cell distribution width and mean platelet volume are found to be associated with the severity of atherosclerotic disease in patients with peripheral arterial disease. This finding hypothesizes that complete blood counting parameters may serve as a beneficial and cost-effective method for monitoring atherosclerotic peripheral disease.Öğe Rosuvastatin may have Neuroprotective Effect on Spinal Cord Ischemia Reperfusion Injury(Bentham Science Publ, 2013) Yavuz, Celal; Demirtas, Sinan; Guclu, Orkut; Karahan, Oguz; Caliskan, Ahmet; Yazici, Suleyman; Mavitas, BinaliIschemia reperfusion injuries can be threatening to end organ viability and can progress, with mortal and morbid outcomes. In particular, neural tissues are highly sensitive to hypoxia and reperfusion stress. This study aimed to determine the neuroprotective effects of rosuvastatin on spinal cord ischemia reperfusion injury. Forty male Sprague-Dawley rats were divided into four equal groups: group I (control), group II (sham with simple laparotomy), group III (ischemia-reperfusion), group IV (ischemia-reperfusion group with continuous rosuvastatin utilization), and group V (ischemia-reperfusion group with rosuvastatin-withdrawal after reperfusion). Spinal cord ischemia was induced by clamping the aorta below the left renal artery and above the aortic bifurcation. Reperfusion was provided after 72nd hours of ischemia. After reperfusion, blood samples and spinal cord tissue samples were taken from all the rats. Oxidative and antioxidant markers from both serum and tissue samples were evaluated, and tissues were examined histopathologically. There were no significant differences between the control and sham groups. A notable increase in oxidative markers was observed in group III compared to group I. In addition, a significant decrease in antioxidant markers was detected in group III. However, there was a marked preservation in the tissue and blood samples of groups IV and V compared to group III in terms of oxidative damage. Additionally, definitive prophylaxes were seen in the histopathological examination of the tissue samples in groups IV and V compared with group III. These significant findings show that rosuvastatin has a considerable protective effect on neural tissue against oxidative damage. Likewise, the early withdrawal of rosuvastatin has a clear neuroprotective effect similar to that of continuous therapy. Nevertheless, other systematic effects and beneficial neural effects of statins should be investigated in further clinical trials.Öğe Serum nitric oxide level could be a predictive biomarker for detection of critical ischaemia duration(Taylor & Francis Ltd, 2013) Yavuz, Celal; Yazici, Suleyman; Karahan, Oguz; Demirtas, Sinan; Caliskan, Ahmet; Guclu, Orkut; Ertas, FarukObjective: To investigate the predictive value of serum nitrate (nitrogen oxide: NOx) levels in the detection of peripheral and mesenteric ischaemia durations. Methods: Rats were sacrificed for determining the basal serum values of NOx in Group I without any intervention. The superior mesenteric artery was clamped in Groups II and III and blood samples were taken at 120 minutes in Group II and at 360 minutes in Group III. The right common femoral artery was clamped in Groups IV and V and blood samples were taken at 120 minutes in Group IV and at 360 minutes in Group V. Results: The peak values of NOx were obtained in Group II and Group IV. NOx levels were reduced in advanced periods of ischaemia. In the other words, the NOx levels were significantly higher at two hours of ischaemia (p<0.05), and NOx levels were reduced to normal ranges at the sixth hour of ischaemia. Conclusion: Early diagnosis and rapid treatment are important for acute ischaemic disorders. Serum NOx levels can be a decisive biomarker for prediction of the critical ischaemia period.Öğe Values of troponin T and myoglobin predictive of non-cardiac ischemia in rats(Mashhad Univ Med Sciences, 2014) Guclu, Orkut; Caliskan, Ahmet; Karahan, Oguz; Demirtas, Sinan; Yazici, Suleyman; Yavuz, Celal; Mavitas, BinaliObjective(s): Biochemical markers are important for the timely diagnosis and follow-up of ischemic events. Most of the markers have been previously studied in the context of cardiac ischemia. However, research on markers of non-cardiac events has been insufficient. Therefore, we investigated the relationship between troponin and myoglobin which are commonly used markers of cardiac ischemia, in non-cardiac ischemia. Materials and Methods: Forty-eight rats were equally divided into six groups. Group I was the control group. Group II was the sham group and received a simple laparotomy. The superior mesenteric artery was clamped in groups III and IV in order to create mesenteric ischemia. The left femoral artery was clamped in groups V and VI in order to create peripheral ischemia. Intracardiac blood samples were taken from all groups (during the 3rd hour of ischemia in groups III and V and the 6th hour of ischemia in group IV and VI) and troponin T and myoglobin levels were measured. Results: Troponin and myoglobin levels were statistically similar in groups I and II. Moreover, increments were detected for troponin and myoglobin in ischemia groups according to group I and II. Furthermore, higher troponin Tlevels were detected after three hours of mesenteric ischemia and higher myoglobin values were observed after six hours of mesenteric ischemia (P<0.05). Conclusion: Troponin T and myoglobin are not specific for non-cardiac ischemia, and they may be useful for detecting other ischemic events.
