• Levent Ozdogan, Handan Sastim, Dilsen Ornek, Aysun Postaci, Taner Ayerden, and Bayazit Dikmen.
• Anaesthesia and Reanimation Department, Ankara Numune Training and Research Hospital, Turkey.
• Braz J Anesthesiol. 2013 Jan 1;63(1):139-43.

Background And ObjectivesTo assess the potential neurotoxic effects at the ultrastructural level of magnesium sulfate administered intrathecally as a single or multi-dose.MethodsOur study was conducted with 24 Sprague-Dawley rats that weighed 250-300 g. After a 4-hour fast, the rats were given 10 mg.kg(-1) xylazine chloride intraperitoneal and then randomly allocated into three groups. Group I (n = 8) received 0.9% normal saline, Group II (n = 8) was given one intrathecal injection of 0.02 mL of 15% magnesium sulphate, and Group III (n = 8) was given 0.02 mL of 15% magnesium sulphate once a day for seven days. The injections were given within 0.40x50 mm from the lumbar area. After seven days, the animals were sacrificed under anesthesia with an aortic injection of 10% formaldehyde and their tissues were fixed. The medulla spinalis was then examined and histopathologically evaluated under an electron microscope. The Kruskal-Wallis test was used for statistical evaluation. A value of p < .05 was considered to be statistically significant.ResultsSignificant neurodegeneration was detected in rats given single or repeated magnesium sulphate injections compared to the control group. The histopathological evaluation score of this group was also high.ConclusionsBased on electron microscopic examination, we found that intrathecal magnesium sulphate administration induced neurodegeneration.Copyright © 2013 Sociedade Brasileira de Anestesiologia. Published by Elsevier Editora Ltda. All rights reserved.

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