Magnesium is essential for healthy heart rhythm.
It is involved in transporting electrolytes, such as calcium and potassium -which are important for sending nerve signals and muscle contractions (heartbeat)- into cells.
Research indicates that magnesium deficiency, or restricted magnesium intake, increases instances of arrhythmia (irregular heartbeats).
When a heart is healthy, it contains more magnesium than other muscles and when magnesium levels are low, the levels in the heart cells drop more than in other muscles. Muscles need magnesium in order to function as each molecule of myosin (muscle protein) contains one atom of magnesium. ‘Magnesium is a vital structural component of all muscle cells, and the heart is mainly a muscle.’
In hospital settings..
Magnesium has been administered for acute myocardial infarction (heart attack) patients and cardiac arrhythmia (irregular beating of the heart) with positive results.
Magnesium is also used for treating angina.
The importance of magnesium with regard to heart health can be summarised as follows:
Post heart attack, magnesium…
Before heart problems arise, be sure to take care of your magnesium levels! This can be through eating more magnesium-rich foods; daily applications of magnesium oil, lotion or gel, and regular magnesium flakes foot soaks and baths.
,  Mildred S. Seeling and Andrea Rosanoff, ‘The Magnesium Factor’, (New York: Avery Books, 2003) p.10
 “Magnesium Is Found to Aid Bypass Patients – NYTimes.com.” The New York Times – Breaking News, World News & Multimedia. 06 Nov. 1992. [accessed: 12.01.2011] <http://query.nytimes.com/gst/fullpage.html?res=9E0CE1D9103CF935A35752C1A964958260&scp=8&sq=Magnesium&st=nyt>
 Carolyn Dean, M.D., N.D., ‘The Magnesium Miracle’, (New York: Ballantine Books, 2007) p.xix
 Mark Sircus, Ac., O.M.D., ‘Transdermal Magnesium Therapy’, (Chandler: Phaelos Books, 2007) p.127
 “Medicinal Ingredients – Magnesium.” Medical Explorer – Medical Advice, Drug Information, Health Articles. [accessed: 12.01.2011] <http://www.medical-explorer.com/medicinal-ingredients-m/magnesium_1.html>.
 Carolyn Dean, M.D., N.D., ‘The Magnesium Miracle’, (New York: Ballantine Books, 2007) pp. 99
 A build up of scarring and fats in the arterial walls that are referred to as ‘plaques’, which cause hardening, narrowing and loss of elasticity of arteries.