Browsing by Author "Aksoy, Mehmet"

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Comparative Investigation of Protective Effects of Metyrosine and Metoprolol Against Ketamine Cardiotoxicity in Rats
(Humana Press inc, 2015) Ahiskalioglu, Ali; Ince, Ilker; Aksoy, Mehmet; Ahiskalioglu, Elif Oral; Comez, Mehmet; Dostbil, Aysenur; Suleyman, Bahadir
This study investigated the effect of metyrosine against ketamine-induced cardiotoxicity in rats and compared the results with the effect of metoprolol. In this study, rats were divided into groups A, B and C. In group A, we investigated the effects of a single dose of metyrosine (150 mg/kg) and metoprolol (20 mg/kg) on single dose ketamine (60 mg/kg)-induced cardiotoxicity. In group B, we investigated the effect of metyrosine and metoprolol, which were given together with ketamine for 30 days. In group C, we investigated the effect of metyrosine and metoprolol given 15 days before ketamine and 30 days together with ketamine on ketamine cardiotoxicity. By the end of this process, we evaluated the effects of the levels of oxidant-antioxidant parameters such as MDA, MPO, 8-OHGua, tGSH, and SOD in addition to CK-MB and TP I on cardiotoxicity in rat heart tissue. The experimental results show that metyrosine prevented ketamine cardiotoxicity in groups A, B and C and metoprolol prevented it in only group C.
New Determinants for Casual Peripheral Mechanism of Neurogenic Lung Edema in Subarachnoid Hemorrhage Due To Ischemic Degeneration of Vagal Nerve, Kidney and Lung Circuitry. Experimental Study
(Acta Cirurgica Brasileira, 2019) Soyalp, Celaleddin; Kocak, Mehmet Nuri; Ahiskalioglu, Ali; Aksoy, Mehmet; Atalay, Canan; Aydin, Mehmet Dumlu; Ozmen, Sevilay
Purpose: To evaluate whether there is a relationship between renal artery vasospasm related low glomerular density or degeneration and neurogenic lung edema (NLE) following subarachnoid hemorrhage. Methods: This study was conducted on 26 rabbits. A control group was formed of five animals, a SHAM group of 5 to which saline and a study group (n=16) injected with homologous blood into the sylvian cisterna. Numbers of degenerated axons of renal branches of vagal nerves, atrophic glomerulus numbers and NLE scores were recorded. Results: Important vagal degeneration, severe renal artery vasospasm, intrarenal hemorrhage and glomerular atrophy observed in high score NLE detected animals. The mean degenerated axon density of vagal nerves (n/mm(2)), atrophic glomerulus density (n/mm(3)) and NLE scores of control, SHAM and study groups were estimated as 2.40 +/- 1.82, 2.20 +/- 1.30, 1.80 +/- 1.10, 8.00 +/- 2.24, 8.80 +/- 2.39, 4.40 +/- 1.14 and 154.38 +/- 13.61, 34.69 +/- 2.68 and 12.19 +/- 1.97 consecutively. Degenerated vagal axon, atrophic glomerulus and NLE scores are higher in study group than other groups and the differences are statistically meaningful (p<0.001). Conclusion: Vagal complex degeneration based glomerular atrophy have important roles on NLE following SAH which has not been extensively mentioned in the literature.
The Suppression of Endogenous Adrenalin in the Prolongation of Ketamine Anesthesia
(Churchill Livingstone, 2014) Aksoy, Mehmet; Ince, Ilker; Ahiskalioglu, Ali; Dostbil, Aysenur; Celik, Mine; Turan, Mehmet Ibrahim; Suleyman, Halis
This study investigated whether or not the anesthetic effect of ketamine in rats is dependent on adrenal gland hormones. The study was performed on two main rat groups, intact and adrenalectomized. Rat were divided into subgroups and given appropriate doses of ketamine, metyrapone or metyrosine. Durations of anesthesia in the groups were then recorded. Endogenous catecholamine levels were measured in samples taken from peripheral blood. This experimental results showed that ketamine did not induce anesthesia in intact rats at doses of 15 or 30 mg/kg, and that at 60 mg/kg anesthesia was established for only 11 min. However, ketamine induced significant anesthesia even at a dose of 30 mg/kg in animals in which production of endogenous catecholamine (adrenalin, noradrenalin dopamine) was inhibited with metyrosine at a level of 45-47%. Ketamine at 60 mg/kg in animals in which endogenous catecholamine was inhibited at a level of 45-47% established anesthesia for 47.6 min. However, ketamine at 30 and 60 mg/kg induced longer anesthesia in adrenalectomized rats with higher noradrenalin and dopamine levels but suppressed adrenalin production. Adrenalin plays an important role in the control of duration of ketamine anesthesia, while noradrenalin, dopamine and corticosterone have no such function. If endogenous adrenalin is suppressed, ketamine can even provide sufficient anesthesia at a 2-fold lower dose. This makes it possible for ketamine to be used in lengthy surgical procedures. (C) 2014 Elsevier Ltd. All rights reserved.