This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
ECG changes in hyperkalemia are all except 
Select and explain. 
A. Slender peaked T waves, B. Depressed ST-segment, C. QRS complex is slurred, D. Wide QRS
B: Depressed ST-segment
Answer: B: Depressed ST-segment 
Explanation: In Hypokalemia (plasma K+ +-3.5 meq/L) ST-segment depression is seen;Hyperkalemia (plasma K+ +-7.0 meq/L). The PR and QRS intervals are within normal limits. Very tall, slender peaked T waves are now present.Hyperkalemia (plasma K+ +-8.5 meq/L). There is no evidence of atrial activity; the QRS complex is broad and slurred and the QRS interval has widened to 0.2 s. The T waves remain tall and slender. Fuher elevation of the plasma K+ level may result in ventricular tachycardia and ventricular fibrillation.