Peaked T waves

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Peaked T waves refers to the pointed, tall, peaked shape of T waves on the EKG in the setting of certain abnormalities such as hyperkalemia.

Causes

• Earliest sign of hyperkalemia
• Occurs with K > 5.5 meq/li
• Differential diagnosis of this EKG change includes the T wave changes of bradycardia or stroke.
• Prominent U waves and QTc prolongation are more consistent with stroke than hyperkalemia.

Electrocardiographic Examples

Progression of T wave changes in hyperkalemia