The left atrial appendage is a sac attached to the left upper chamber of the heart where blood clots and strokes originate from in patients with atrial fibrillation. (sciencedaily.com)
An atrial septal defect (ASD) is an opening or hole in the wall that separates the two upper chambers of the heart. (aboutkidshealth.ca)
An atrial septal defect is a hole between the two upper chambers of the heart. (aboutkidshealth.ca)