What is a common ECG finding in hypokalemia?

In the context of hypokalemia, the most notable ECG finding is the presence of U waves. U waves can appear following the T wave and are associated with electrolyte imbalances, specifically low potassium levels. This occurrence is primarily due to the delayed repolarization of the cardiac myocytes, which leads to the characteristic wave that is seen on the ECG when potassium levels drop.

Monitoring U waves is essential because they can serve as an early indicator of hypokalemia and may help in preempting further cardiac complications associated with this electrolyte disturbance.

In contrast, while QT prolongation, ST elevation, and QRS widening are significant ECG changes associated with other conditions or electrolyte imbalances, they are not specifically characteristic of hypokalemia. While QT prolongation might be seen in various circumstances, including hypokalemia, it is more commonly linked to other factors rather than being a direct result of low potassium alone.