This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
All the following are the electrocardiographic features of hyperkalemia except 
Select and explain. 
A. Prolonged PR interval, B. Prolonged QT interval, C. Sine wave pattern, D. Loss of P waves
B: Prolonged QT interval
Answer: B: Prolonged QT interval 
Explanation: Hyperkalemia pro- duces a sequence of changes (), usually beginning with nar- rowing and peaking (tenting) of the T waves. Fuher elevation of extra- cellular K+ leads to AV conduction disturbances, diminution in P-wave Ref Harrison 20th edition pg 1421 amplitude, and widening of the QRS interval.