A prolonged QT interval has a variety of causes and can be a very serious ECG finding, as it may lead to the potentially ... hypomagnesemia and hypokalemia) and certain disease states (ie ...

This is depicted below, followed by full 12-lead ECG examples of digoxin toxicity ... in higher serum potassium levels. In states of hypokalemia, or low potassium, digoxin toxicity is actually ...