That Prolonged QT Warning?! Magnesium for Cardiac Arrhythmias

You get a pop-up warning in the electronic medical record about potentially adverse interaction with a prolonged QT interval. What’s the risk, right? Afraid of a little torsades de pointes? Can’t we just give some prophylactic magnesium and call it a day? Let’s see if there’s any literature out there… First off, let’s review magnesium.
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