Atrial septal defect. (Redirected from Patent foramen ovale) Atrial septal defect (ASD) is a congenital heart defect in which blood flows between the atria (upper chambers) of the heart. Normally, the atria are separated by a dividing wall, the interatrial septum.
If you think your cat is sleeping a lot, youâre not off base. Cats tend to sleep in some form or another for anywhere from 16 to 20 hours a day.
Best Answer: Lions, and other cats, can sleep for up to 20 hours a day. However, that doesn't mean that every lion sleeps for 20 hours every day. One day they might spend 2 hours playing and 5 hours hunting, and sleep the rest, for example.