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
All are true about hyperophic cardiomyopathy, except : 
Select and explain. 
A. Systolic dysfunction, B. Concentric hyperophy, C. Diastolic dysfunction, D. Double apical impulse
A: Systolic dysfunction
Answer: A: Systolic dysfunction 
Explanation: Answer is A (Systolic dysfunction) 'The ubiquitous pathophysiological abnormality in hyperophic obstructive cardiomyopathy is not systolic but rather diastolic dysfunction' Note: It has now been demonstrated that systolic dysfunction characterized by an outflow tract pressure gradient is present only in about one quaer of patients with HCM. The pathophysiological abnormality that has now been demonstrated is diastolic dysfunction characterized by increased stiffness of the hyperophied muscle.