What EKG changes will you see if a patient has hyperkalemia?

In hyperkalemia, the EKG changes typically include peaked T waves, which are often the earliest sign. As the condition progresses, you may also see widening of the QRS complex, a prolonged PR interval, and eventually, a sine wave pattern or even ventricular fibrillation. These changes reflect the effect of elevated potassium levels on cardiac conduction and repolarization.