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 are usually considered to be adults when they're around 12 months in age. Although adult cats usually don't sleep as much as kittens, they too can boast pretty impressive shut-eye hours. Normal mature cats that are fit as a fiddle often sleep for between 13 and 18 hours daily.