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 sleep more than adult cats. Photo Credit: Â© Amy Shojai, CABC. Cat sleep and understanding your sleepy cat is important because cats sleep two-thirds of their life away. That's sixteen hours or more each day, and is more than any other mammal, except for the opossum and some bats.