The Resuscitation Team Suspects That Hyperkalemia is the Cause of Cardiac Arrest in a Patient Brought to the Emergency Department.

The resuscitation team suspects that hyperkalemia is the cause of cardiac arrest in a patient brought to the emergency department. Which finding on a 12-lead ECG would confirm this suspicion?

A. Wide-complex ventricular rhythm and tall, peaked T waves
B. ST-segment changes, T-wave inversion
C. Flat T waves, prominent U waves and possibly prolonged QT intervals
D. Narrow-complex ventricular tachycardia

Correct answer is option A. Explanation: In hyperkalemia the patient's 12-lead ECG rhythm strip will show wide-complex ventricular rhythm and tall, peaked T waves.