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.
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 of â¦ time in a state of lowered awareness that is not exactly sleep and not exactly awake, and that substitutes for some sleeping time.s they age, cats will sleep less, to about 12 to 13 hours a day, but they will also spend a lot of â¦ time in a state of lowered awareness that is not exactly sleep and not exactly awake, and that substitutes for some sleeping time.