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.
Because about 70 percent of their day is naturally reserved for just that. Many people worry that their cat sleeps too much. The truth is, cats sleep twice as much as we do, so it just seems like they sleep all the time. So sleeping for a long time is a normal part of your catâs daily routine.