Brief Answer: Yes, ECG can be affected by disbalanced mineral levels in blood. You should take mineral supplements based on their blood level and correct your diet. Detailed Answer: Hello, Thank you for using HCM. The gastric by pass and the diet may cause a disbalance in mineral levels in blood, which may be reflected in EKG trace. Because electrolytes have so many different roles within the body, their imbalance can affect lot of systems, that s why they should have a special consideration. You should test the level of sodium, potassium, chloride, phosphate, calcium and magnesium in blood in way to correct their level by taking needed supplements as treatment. Meanwhile you can begin immediately correcting your diet. Take plenty of vegetables and fruits that provide potassium and magnesium such as leafy greens, broccoli, cabbage, sweet potatoes, squash, bananas, and avocados. You should give up from junk foods, takeout and restaurant foods, while instead you should cook more fresh foods at home. Eat a lot of fruits such as: Coconut water, Celery, Watermelon, Cucumber, Kiwi etc, to avoid dehidration. Drink approximately 2-3 liter of water per day. Finally, to obtain enough calcium naturally you should eat foods like organic probiotic yogurt, cultured raw cheeses and raw milk. Hope this is helpful. Let me know if you need more clarifications. Otherwise please close and rate the answer. Kind Regards, Dr. Juarda