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
QT prolongation is seen in all, except: 
Select and explain. 
A. Hypothermia, B. Digitalis toxicity, C. Hypocalcemia, D. Romanowand syndrome
B: Digitalis toxicity
Answer: B: Digitalis toxicity 
Explanation: Answer is B (Digitalis toxity) QT interval is shoened in digitalis toxity and not prolonged QT interval Is measured from the beginning of Q wave to the end of T wave Q It is the time taken for total ventricular events i.e. depolarization as well as repolarization 2 Normal QT interval should not exceed 42 seconds