This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
ECG changes of hypomagnesemia is: March 2004 
Select and explain. 
A. Decreased QT interval, B. Increased QT interval, C. Greatly increased PT interval, D. Tall T waves
B: Increased QT interval
Answer: B: Increased QT interval 
Explanation: Ans. B i.e. Increased QT interval