What effect does hypokalemia have on the T wave?

• A. Elevated
• B. Flat or inverted
• C. Peaked
• D. No effect

Answer: (B)

Hypokalemia, which is a condition characterized by low levels of potassium in the blood, has a specific effect on the T wave in an electrocardiogram (ECG). When potassium levels are low, the T wave can become flat or inverted. This change is due to the critical role that potassium plays in cardiac repolarization. During repolarization, potassium ions exit the cardiac cells, and a deficiency can disrupt this process, resulting in altered T wave morphology.

The flat or inverted T wave is an important diagnostic feature in recognizing hypokalemia in the context of an ECG interpretation. Clinicians often monitor the T wave closely in patients suspected of having electrolyte imbalances, as these changes can be indicative of more serious underlying conditions and can help guide appropriate treatment measures. This characteristic T wave change serves as a valuable tool in identifying and managing patients with hypokalemia effectively.