Choose the correct statement regarding ECG changes in hyperkalemia.

Correct option is C

In hyperkalemia, elevated potassium levels significantly impact cardiac electrophysiology. ECG changes typically progress with severity. Early signs include tall, peaked T waves. As potassium levels rise further, P waves flatten, PR intervals prolong, QRS complexes widen, and eventually, the ECG may show a sine-wave pattern leading to cardiac arrest. Recognizing these changes is critical for urgent management.
Explanation of options: (a) Normal ‘P’ wave and ‘QRS complex’, rounded ‘T’ wave and shallow ‘U’ wave – This describes a normal ECG or mild hypokalemia, not hyperkalemia. (b) Peak ‘P’ wave, ‘ST’ depression, shallow ‘T’ wave and prominent ‘U’ wave – These are typical features of hypokalemia, not hyperkalemia. (c) Flat ‘P’ wave, prolonged ‘PR’ interval, widened ‘QRS complex’ and tall ‘T’ wave – This is the correct answer. These are classic ECG features seen in progressive hyperkalemia. (d) Peak ‘P’ wave, absent ‘QRS complex’ and prominent ‘U’ wave – These findings do not align with hyperkalemia; prominent U waves occur in hypokalemia.