What does hypokalemia typically look like on an EKG?

What does hypokalemia typically look like on an EKG?

• A. Flattened or inverted T wave with a U wave following
• B. Shortened QT interval
• C. Large S wave in lead I
• D. Widened QRS complex

Answer: (A)

Hypokalemia typically manifests on an EKG with flattened or inverted T waves and the presence of a U wave following the T wave. The T wave changes are indicative of the altered repolarization that occurs due to low potassium levels. In hypokalemia, the decreased serum potassium affects the myocardial cells, particularly impacting their ability to repolarize normally after depolarization. The U wave, which is a small positive deflection that follows the T wave, is specifically associated with hypokalemia and can be a key diagnostic marker.

Other potential EKG abnormalities related to potassium imbalances, such as a shortened QT interval or widened QRS complex, are more closely associated with other electrolyte disturbances. Therefore, recognizing the specific EKG changes associated with hypokalemia is crucial for accurate diagnosis and timely intervention.