This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Which one of the following electrocardiographic changes is found in hypercalcaemia - 
Select and explain. 
A. PropongedQ-T interval, B. Sho Q-T interval, C. Increased QRS interval, D. Sho P-R interval
B: Sho Q-T interval
Answer: B: Sho Q-T interval 
Explanation: ECG Changes in Hypercalcaemia The main ECG abnormality seen with hypercalcaemia is shoening of QT interval In severe hypercalcaemia, Osborn waves (J waves) may be seen Ventricular irritability and VF arrest has been repoed with extreme hypercalcaemia Bizarre-looking QRS complexes Very sho QT interval J waves = notching of the terminal QRS, best seen in lead V1 Ref Harrison 20th edition pg 1435