Health Library Atrial Septal DefectsFrom Healthwise

National Organization for Rare Disorders, Inc.

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It is possible that the main title of the report Atrial Septal Defects is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.

• ASD
• Atrioseptal Defects

• Ostium Primum Defect (endocardial cushion defects included)
• Ostium Secundum Defect
• Sinus Venosus

Atrial septal defects (ASDs) are a group of rare disorders of the heart that are present at birth (congenital) and involve a hole in the wall (septum) that separates the two upper-chambers (atria) of the heart.

Normally the heart has four chambers: two upper chambers known as atria that are separated from each other by a fibrous partition known as the atrial septum and two lower chambers known as ventricles that are separated from each other by the ventricular septum. Valves connect the atria (left and right) to their respective ventricles. A small opening between the two atria (foramen ovale) is present at birth. Shortly after birth, the atrial septum gradually grows and seals this opening. In infants with atrial septal defects, the atrial septum may not close properly or may be malformed during fetal development. In these disorders, the opening (called patent foramen ovale) between the atria persists long after it should be closed, resulting in an increase in the workload on the right side of the heart and excessive blood flow to the lungs.

Initially, the symptoms associated with atrial septal defects may be absent or so mild that they may go unnoticed. Frequently this disorder is not recognized until school age or even adulthood. In adults with undetected atrial septal defects, various respiratory problems and/or heart failure may develop.

Several forms of atrial septal defects are recognized. They are classified according to their location in the septum. The term primum refers to defects that are in the lower part of the septum. The term secundum refers to defects that are located in the middle of the septum, and the term sinus venosus refers to defects in the upper part of the septum.

March of Dimes Birth Defects Foundation
1275 Mamaroneck Avenue
White Plains, NY 10605
Tel: (914)428-7100
Fax: (914)997-4763
Tel: (888)663-4637
Email: Askus@marchofdimes.com
Internet: http://www.marchofdimes.com

American Heart Association
National Center
7272 Greenville Avenue
Dallas, TX 75231-4596
Tel: (214)373-6300
Fax: (214)373-0268
Tel: (800)242-8721
Email: inquire@heart.org
Internet: http://www.americanheart.org

Congenital Heart Anomalies, Support, Education, & Resources
2112 North Wilkins Road
Swanton, OH 43558
Tel: (419)825-5575
Fax: (419)825-2880
Email: chaser@compuserve.com
Internet: http://www.csun.edu/~hcmth011/chaser/chaser-news.html

American Lung Association
61 Broadway, 6th Floor
New York, NY 10006
USA
Tel: 2123158700
Fax: 2123158870
Tel: 8005864872
Internet: http://www.lungusa.org

NIH/National Heart, Lung and Blood Institute Information Center
P.O. Box 30105
Bethesda, MD 20824-0105
Tel: (301)592-8573
Fax: (301)251-1223
Email: nhlbiinfo@rover.nhlbi.nih.gov

Kids With Heart National Association for Children's Heart Disorders, Inc.
1578 Careful Dr
Green Bay, WI 54304-2941
Tel: (920)498-0058
Fax: (920)498-0058
Tel: (800)538-5390
Email: kidswithheart@greenbaynet.com
Internet: http://www.kidswithheart.org

Little Hearts, Inc.
P.O. Box 171
Cromwell, CT 06416
USA
Tel: 8606350006
Fax: 8606350006
Tel: 8664354673
Email: info@littlehearts.org
Internet: http://www.littlehearts.org

Congenital Heart Information Network
1561 Clark Dr
Yardley, PA 19067
Tel: (215)493-3068
Fax: (215)493-3068
Email: mb@tchin.org
Internet: http://www.tchin.org

This is an abstract of a report from the National Organization for Rare Disorders, Inc. ® (NORD). A copy of the complete report can be obtained for a small fee by visiting the NORD website. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational treatments (if available), and references from medical literature. For a full-text version of this topic, see http://www.rarediseases.org/search/rdblist.html

The information provided in this report is not intended for diagnostic purposes. It is provided for informational purposes only. NORD recommends that affected individuals seek the advice or counsel of their own personal physicians.

It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report.

This disease entry is based upon medical information available through the date at the end of the topic. Since NORD's resources are limited, it is not possible to keep every entry in the Rare Disease Database completely current and accurate. Please check with the agencies listed in the Resources section for the most current information about this disorder.

For additional information and assistance about rare disorders, please contact the National Organization for Rare Disorders at P.O. Box 1968, Danbury, CT 06813-1968; phone (203) 744-0100; web site www.rarediseases.org or email orphan@rarediseases.org

Last Updated:  3/12/2008
Copyright  1986, 1994, 1999, 2006 National Organization for Rare Disorders, Inc.

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