With which of the following conditions would a contrast agent not likely be used to enhance the echo diagnosis?
A.) Ventricular septal defect.
B.) Atrial septal defect.
C.) Idiopathic hypertrophic subaortic stenosis.
D.) Patent ductus arteriosus.
C.) Idiopathic hypertrophic subaortic stenosis. Contrast agents are more helpful in defining suspected shunts.
(this multiple choice question has been scrambled)