ECG variations in electrolyte imbalances, specifically focusing on changes caused by calcium and potassium levels. Here's an interpretation: 1. Potassium (K) imbalances: Elevated potassium (K↑) can cause changes in the T wave (e.g., peaked T waves). Low potassium (K↓) might lead to flattened T waves or the appearance of U waves. 2. Calcium (Ca ) imbalances: Increased calcium (Ca ↑) shortens the QT interval (due to ST segment shortening). Decreased calcium (Ca ↓) prolongs the QT interval.