Efficacy and vasodilatory benefit of magnesium prophylaxis for protection against spinal cord ischemia - "...Comparison of changes in spinal circulation revealed less reduction in blood flow during ischemia in the magnesium-treated group. In conclusion, magnesium may have potential prophylactic benefits during ischemia by exerting a neuroprotective effect through vasodilation of the spinal cord vasculature." http://www.ncbi.nlm.nih.gov/pubmed/17484971