What are the changes in the electrocardiogram (ECG) in hypokalemia?

Patient's question:

Because of a certain disease, I have been unable to stop taking medication for a long time. Due to the medication, my endocrine system has become problematic. Now, I want to stop taking the medication and regulate my body. Could you please tell me about the changes in the electrocardiogram for hypokalemia?

Doctor's answer:

Hypokalemia refers to a decrease in serum potassium levels. The normal range of serum potassium is 3.5 to 5.4 millimoles per liter. Patients with hypokalemia may experience recurrent numbness in the extremities. On an electrocardiogram (ECG), the main manifestations include flattened or inverted T waves, the reappearance of U waves, downward movement of the ST segment, sinus tachycardia, and ventricular premature beats. Paroxysmal tachycardia is common. Treatment involves potassium supplementation, which can be administered orally or intravenously.

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