In this trial of patients with aneurysmal subarachnoid hemorrhage, they were randomized to IV magnesium versus placebo, for 10 days followed by a taper (with a goal level 2-2.5 mmol/L). Delayed ischemic infarction occurred significantly less in the magnesium group (22% vs 51%, assessed by CT), as did vasospasm (67% vs 85%, assessed by USG). This relatively simple and inexpensive intervention holds promise for patients with SAH (abstract)
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