مقاله نارسایی دریچه قلبی

مقاله نارسایی دریچه قلبی (لاتین)

چکیده:

 

List of Subject

Title:

What Is Atrial Septal Defect?

How the Heart Works

What Causes Atrial Septal Defect?

Resources


What Is Atrial Septal Defect?

An atrial septal defect (ASD) is a hole in the wall (septum) that separates the two upper chambers (atria) of the heart. The defect allows blood to flow from one atrium to the other, usually from the left side to the right side. This causes extra blood flow:

    In the right atrium
    In the right ventricle
    To the lungs

Figure A shows the normal anatomy and blood flow of the interior of the heart. Figure B shows a heart with an atrial septal defect, which allows oxygen-rich blood from the left atrium to mix with oxygen-poor blood from the right atrium.

In a normal heart, oxygen-poor (blue) blood returns from the body to the right atrium. From the right atrium, the blue blood flows to the right ventricle—one of the two lower chambers of the heart—and is pumped to the lungs to pick up oxygen. After traveling through the lungs, the blood is now oxygen-rich and red. The red blood returns from the lungs to the left atrium and goes to the left ventricle, where it is pumped to the body. The right and left sides of the heart are normally completely separated by the septum. The septum keeps the blue blood from mixing with the red blood. The later section "How the Heart Works" explains the process in greater detail.