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.
Cats sleep for up to 18 hours a day, kittens don't sleep for that long as they have lots of energy and usually nap for two hours. Also, she may be sleeping at night when you are, so you don't really know.