As a medical professional with expertise in cardiology, I can explain that a peaked T wave is a specific alteration in the appearance of the T wave on an electrocardiogram (ECG). The T wave is the part of the ECG that represents the repolarization, or recovery phase, of the ventricles of the heart after they have been depolarized and contracted. Under normal circumstances, T waves are rounded and symmetrical. However, in certain conditions, such as hyperkalemia (elevated levels of potassium in the blood), the T wave can become abnormally tall and narrow. This change is significant because it can be an early sign of a potentially life-threatening condition. **read more >>

Serum potassium is the major intracellular ion that participates in the depolarization and repolarization of myocardial cells. Hence its serum concentration has a profound effect on the QRS and ST-T complex. Narrow and tall peaked T wave (A) is an early sign of hyperkalemia.read more >>