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.
Only a quarter of the time that your cats spend sleeping is actually when they are in a deep sleep. This is true for younger cats at least, as older cats may spend more like 30 to 40% in a deep sleep. Typically, if your cat is curled up in deep sleep with twitching paws or whiskers, they are dreaming .