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.
1 Sloths typically beat out most cats in terms of sleep time, coming in at an impressively slothful 19 to 20 hours a day.  In the wild, female lions tend to sleep more than male lions.