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.
Around 16 hours seems to be the average, but young kittens and senior cats can snooze even longer: around 18 hours a day. Many people believe their kittens are nocturnal and are awake and active all through the night. This is not true. Cats are crepuscular animals.