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Öğe A comparative analyses effects of dexmedetomidine and etomidate on motor coordination and analgesia in rats(Scholars Research Library, 2015) Ozcan B.; Barişkaner H.Dexmedetomine selective alfa-2 adrenoreceptor agonist is nonnarcotic analgesic, hypnotic and sedative imidazole derivative agent. Etomidate is short acting hypnotic imidazole derivative anesthesic agent. In this study, we aimed to compare the analgesic and motor coordination effects of etomidate and dexmedetomidine in rats. In our study Wistar rats were used. The animals (n = 7) were randomly seperated 7 equal groups; saline group, etomidate group (2,5 mg/kg, 5 mg/kg, 10 mg/kg) and dexmedetomidine group (12,5 ?g/kg, 30 ?g/kg, 40 ?g/kg). Pain measurement tests (von Frey test) and motor coordination (Rotarod) tests of 0th, 15th, 30th and 60th minutes were separately performed for each animal and datas were recorded. 120th minute added for dexmedetomidene and saline group. In von Frey tests etomidate's all doses were found statistically time-dependent significant differences to 0th minute (p<0,05). In the rotarod test 5 mg/kg and 10 mg/kg doses of etomidate were showed sedation at 15th and 30th minutes (p<0,05). In von Frey test dexmedetomidine was found at 15th, 30th and 60th minutes time-dependent significant differences to 0th minute (p<0,05). Also 30 ?g/kg and 40 ?g/kg doses were showed analgesic effects at 120th minute (p<0,05). Dexmedetomidine was found time and dose-dependent sedative effect in the rotarod test (p<0,05). In ourstudy etomidate and dexmedetomidine were showed effective analgesic and sedative effects on rat models of mechanic pain and rotarod test. These two agents exerted time-dependent analgesic and sedative effects. In von Frey test at 60th minutes, the latency time of the dexmedetomidine higher dose was longer than that etomidate's higher dose. In rotarod test etomidate's higher dose was showed a significant difference at 15th minutes compared dexmedetomidine. However dexmedetomidine's 30 ?g/kg dose was showed a significant difference at 30th minute compared to etomidate.Öğe The effects of sufentanil and remifentanil in the isolated perfused rat kidney [Sufentanil ve remifentanilin izole perfüze rat böbre?i üzerine etkileri](2004) Tuncer S.; Barişkaner H.; Yosunkaya A.; Kiliç M.; Do?an N.; Otelcio?lu Ş.In this study, the effects of indomethacin (prostaglandin synthase inhibitor), propranolol (beta adrenergic receptors blocker), tetraethylammonium (TEA) (calcium-dependent potassium channel blocker) and glibenclamide (ATP-sensitive potassium channel blocker), NG nitro-L-arginine (NO synthetase inhibitor) and naloxame (nonselective opioid receptor antagonists) on the responses induced by sufentanil and remifentanil were investigated in the isolated perfused rat kidney. Renal arter was cannulated. Then the kidney was perfused continueously with warmed (37 °C) and aerated (95% O 2 and 5% CO 2). Krebs Henselieit solution by using a peristaltic pump delivering a constat flow (8-10 ml/min). Vascular responses were detected as changes in perfussion pressure, which was monitored continuously with a pressure transuder and recorded on polygraph. After phenilephrine (PE)-induced vasoconstriction had reached a platoe, sufentanil or remifentanil were given. Vasodilatation was recorded. Antagonists or inhibitors were added and responses were recorded. At the end of each experiment; papaverine was used to obtain the maximum dilatation. None of the used antagonists or inhibitors were not effected the submaximum PE construction. The used opioids were not alter in basal perfusion pressure. Antagonists or inhibitors had no effect on papaverine-induced dilatation. Bolus addition of sufentanil and remifentanil produced concentration dependent vasodilation. Indomethacine L-NAME, propranolol, naloxone and glibenclamide did not significantly alter responses of both of the opioids (p>0.05). But, sufentanil and remifentanil induced dilatation were significantly affected by TEA (p<0.05). The present results demonstrated that sufentanil and remifentanil decrease perfusion pressure in the isolated rat kidney and such mechanism may involve the calcium actived K + channels activation.Öğe Systemic effects of epidural betamethasone injection(2004) Tuncer S.; Barişkaner H.; Yosunkaya A.; Reisli R.; Ökesli S.A single epidural injection of a steroid may produce a suppression of the adrenocortical secretion. We aimed to evaluate systemic effects of a single epidural injection of betamethasone in this study. The study included 33 patients with low back pain. None of the patients had received local or systemic steroid therapy within 2 months before the injection. The epidural injection consisted of 10 mg of betamethasone diluted in 8 ml 0.25% bupivacaine. Injections were performed between 8:00 and 9:00 a.m. Before the injection in the same day (D0) cortisol, ACTH, fasting levels of glucose, triglycerides, cholesterol, sodium, and potassium were checked in the blood. The same assays were done again by the same laboratory at 15, 30, 45 min, and 7 (D7) and 21 (D21) days after the steroid injections. In all patients, cortisol and ACTH were normal at D0. ACTH and cortisol significantly decreased 45 min and at D7 after steroid injection, but returned to normal on D21. There were no significant changes in mean fasting glucose, sodium, potassium, triglycerides or cholesterol levels during the study. Blood pressure values were normal in all patients. As a result, it is concluded that a single epidural injection of betamethasone is associated with transient adrenal suppression.
