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.
Itâs also perfectly normal for an older cat to sleep more of the day away â up to 20 hours, in fact, just as she may have done when she was a small kitten. While most geriatric cats sleep more than they did in the days of their youth, if your senior cat is sleeping less, this may indicate she has a medical problem.