Since birth: It's a congenital defect in which the there is a hole in the wall separating the left and right atria (upper chambers of the heart). It's usually called an "atrial septal defect" or just asd.
Answered 1/3/2014
4.6k views
5 doctors weighed in across 2 answers
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question