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
Which of the following ECG changes is least likely in a patient with left pneumothorax : 
Select and explain. 
A. Inversion of T wave, B. Left axis detion, C. Small Rwave, D. Electrical alternans
B: Left axis detion
Answer: B: Left axis detion 
Explanation: Answer is B (Left axis detion) A left sided pneumothorax will shift the axis of the hea towards the right leading to a right axis detion rather than a left axis detion.