I am not claiming I know what happen. After all if a car stops it does not mean necessarily it is out of gas. There are a lot of reasons for a car to stop functioning or fail. Same with the heart. There are lots of different types of irregularities that have very different significance to the professional. Not so much to the lay person.
But what do we know. We know that the general population is very low in magnesium. It is pandemic for everyone in the US. What does this mean. This means several things, but most importantly it tends to give a person a tendency toward irregular heart beat. Irregular heart beats can mean anything from almost insignificant to you are dying. Depends on the type of irregularity. Depends on the cause.
Sometimes the cause is low magnesium. I must admit many live with low magnesium all there life, but when a irregularity occurs it was not helped by having a low magnesium. In FACT a normal magnesium will frequently correct a irregular heart beat because it the underlying cause for it.
A caveat. There are many magnesium compounds. (Magnesium oxide, the most common type, is a laxative. I recommend magnesium malate and I take 425 mg a day. Women 300 mg a day). If you have insufficient or impaired kidneys do not take magnesium. Normal kidneys no problem. If you have atrial fib do not take magnesium without a doctors advice. It has implications I am not going into now.
Enough said. As always check it out on line. Doc's just do not recommend magnesium supplementation. Ask them why. I think I know why!