A congenital condition (from birth) is unlikely to respond to magnesium supplementation.
Many non-traditional Doctors are familiar with the use of Mg supplementation to help an ailing heart. It can act as an antagonist to calcium helping the heart muscle to beat properly and relax between beats so to speak. Several studies have shown that heart attack victims have a better prognosis if given mg.
Magnesium is a mineral and no body should ever go over board supplementing with it. Every thing has an equal and opposite reaction. Proper balance is always the key. Consult with a knowledgeable heath care adviser.
God bless!