I've always wondered why we use magnesium to deal with many arrhythmias (at least as an adjunct) and have to say that all the doctors I've asked here don't actually know. Anyway today I was reading one of the USMLE books and it says that MgSO4 decreases calcium influx, thus reducing the early afterdepolarizations that perpetuate many arrhythmias. The paragraph was in relation to dig toxicity but I'm guessing the reason applies across the board. Was so excited to finally find the reason for magnesium. :-)
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