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 16 to 18 hours per day. Newborn kittens sleep almost all the time. In time, kittens start sleeping less and less, until their sleeping hours are equivalent to 16 hours. The sleeping hours depend on the cat's age and lifestyle.