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
Low QRS voltage on ECG with left ventricular hyperophy on Echocardiography suggests a diagnosis of: 
Select and explain. 
A. Pericardial effusion, B. Cardiac Amyloidosis, C. Corpulmonale, D. Infective endocarditis
B: Cardiac Amyloidosis
Answer: B: Cardiac Amyloidosis 
Explanation: Answer is B (Cardiac Amyloidosis) Low QRS voltage on ECG with left ventricular hyperophy on Echocardiography suggests a diagnosis of infiltrative cardiomyopathy like amyloidosis. The combination of low QRS voltage plus a thick left ventricle on echocardiogram strongly suggests the diagnosis of infiltrative cardiomyopathy like cardiac amyloidosis. The increased thickness is the amyloid. It is not muscle (not true hyperophy), does not depolarize and therefore adds nothing to QRS voltage