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.
Although the amount of time spent napping varies from cat to cat, and depends on the cat's age and personality, felines spend an average of 13 to 16 hours each day curled up in slumber. Only the opossum and the bat sleep more â napping away almost 20 hours a day. Nobody is sure why cats sleep so much.