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.
A: The average cat sleeps for 15 hours a day, while some cats may even spend as much as 20 hours per day sleeping, according to PetMD. Cats do most of their s... Full Answer > Filed Under: Cats.