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.
Sleeping Habits. If you think cats are lazy because they seem to be sleeping all the time, you may be half right. Cats sleep an average of 13 to 16 hours a day. If a human did that, he'd be called a slacker. The age and general health of the cat has a lot to do with how many hours he will sleep.