Background: Cardiac arrhythmias. especially atrial fibrillation. are among the most common early complications of open-heart surgery. Hypomagnesemia is one of the clinical mechanisms associated with the pathogenesis of postoperative atrial fibrillation. https://safeersappliancers.shop/product-category/neff-ki1413ff0-n70-in-column-integrated-fridge-with-freshsafe/