Question

What electrolyte abnormality is most commonly associated with the presence of peaked T waves on an ECG?

Accepted Answer

The electrolyte abnormality most commonly associated with peaked T waves on an electrocardiogram is hyperkalemia, which is an elevated concentration of potassium in the blood. Potassium is an electrolyte that plays a vital role in the electrical activity of heart cells by regulating the resting membrane potential, which is the electrical charge of a cell when it is at rest. When potassium levels rise too high, the resting membrane potential becomes less negative, causing the heart cells to repolarize or reset their electrical charge more rapidly. On an electrocardiogram, which is a recording of the heart&#x27;s electrical activity, the T wave represents ventricular repolarization, the phase where the heart&#x27;s lower chambers reset electrically. Hyperkalemia accelerates this repolarization phase, creating a sharp, narrow, and tall wave known as a peaked T wave. While peaked T waves are a hallmark sign of hyperkalemia, they specifically reflect the heart&#x27;s sensitivity to high extracellular potassium, which can lead to dangerous arrhythmias if not corrected.

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What electrolyte abnormality is most commonly associated with the presence of peaked T waves on an ECG?