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.
Cats are known for sleeping long hours, and can snooze up to 16 hours a day. However, these hours of sleep do not happen in a row. Cats do not have daily sleep-wake cycles like many mammals. While they are not nocturnal, they are often up at odd hours during the night and this can cause disturbances for owners.If your cat is disrupting your sleep schedule, there are a variety of options to help get your cat to bed on time each night.ats do not have daily sleep-wake cycles like many mammals. While they are not nocturnal, they are often up at odd hours during the night and this can cause disturbances for owners. If your cat is disrupting your sleep schedule, there are a variety of options to help get your cat to bed on time each night.