Please note that this section includes a dedicated page on atrial fibrillation, one of the most common cardiac arrhythmias, affecting more than 15 million people worldwide. Untreated cardiac arrhythmias are a potentially serious medical condition. If left untreated, they can be the cause of serious heart problems and even lead to death. Early detection and treatment are crucial in preventing more serious health problems. It has also been observed that the magnesium level in the right atrial tissue is lower in adult patients with postoperative cardiac arrhythmias compared to patients without arrhythmias after heart surgery.