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.
It varies greatly with the cat's age. Kittens will sleep 17-20 hours a day. As they age, cats will sleep less, to about 12 to 13 hours a day, but they will also spend a lot ofâ¦ time in a state of lowered awareness that is not exactly sleep and not exactly awake, and that substitutes for some sleeping time.