Which abnormality can be observed in a patient with hyperkalemia on an ECG?

• A. Shortened QT interval
• B. Peaked T waves
• C. Inverted P waves
• D. Widened QRS complex

Answer: (B)

In patients with hyperkalemia, the most characteristic abnormality observable on an electrocardiogram (ECG) is peaked T waves. This finding occurs due to the elevated potassium levels affecting the cardiac action potentials, leading to increased repolarization of the myocardium. The peaked T waves reflect a change in the ventricular repolarization pattern, which typically progresses with more severe hyperkalemia to other alterations such as QRS widening and possibly the loss of P waves as the condition worsens.

Peaked T waves represent an initial and critical change that healthcare providers look for when assessing a patient's potassium levels and potential cardiac events. Identifying this abnormality early can be critical for timely intervention, as hyperkalemia can lead to more serious arrhythmias and cardiac implications if not addressed.