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.
On average, dogs sleep about 14 hours a day (though large breeds may sleep more), while cats spend 15 to 20 hours snoozing (yes, be jealous). Dogs tend to nap during the day and sleep through the night, while cats get most of their shuteye during daytime hours and are most active after dark.