conflicting information re: magnesium for afib

On one page you say:

"Full blown health problems, and not just minor problems, can ALSO be magnesium deficiency symptoms- and most people with health problems benefit greatly from a high Magnesium Dosage therapy. Diseases such as:

Heart Disease
Atrial Fibrillation"


On another page you say:
"You should also NOT take magnesium if you currently have an excessively slow heart rate, myasthenia gravis or a heart condition called Atrial Fibrillation unless you specifically get instructions from your doctor to do so."


So which is it; you should take magnesium for atrial fibrillation or you should not take magnesium for atrial fibrillation?

Randy Parkes