Cardiovascular System - Atrial Septal Defects
Embryology - 16 Jun 2024 Expand to Translate |
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Introduction
Atrial Septal Defects (ASD) are a group of common (1% of cardiac) congenital anomolies defects occuring in a number of different forms and more often in females.
- patent foramen ovale- allows a continuation of the atrial shunting of blood, in 25% of people a probe patent foramen ovale (allowing a probe to bepassed from one atria to the other) exists.
- ostium secundum defect
- endocardial cushion defect involving ostium primum
- sinus venosus defect - contributes about 10% of all ASDs and occurs mainly in a common and less common form. Common ("usual type") - in upper atrial septum which is contiguous with the superior vena cava. Less common - at junction of the right atrium and inferior vena cava.
- common atrium
Some Recent Findings
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More? References | Discussion Page | Journal Searches | 2019 References | 2020 References Search term: Atrial Septal Defect <pubmed limit=5>Atrial Septal Defect</pubmed> |
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History
1941
ATRIAL SEPTAL DEFECT.[2]
- "Patent foramen ovale and atrial (or auricular) septal defect (A.S.D.), though both characterised by an aperture in the atrial septum, are embryologically and pathologically different conditions."
Treatment
The surgical repair requires a cardiopulmonary bypass and is recommended in most cases of ostium secundum ASD, even though there is a significant risk involved. Ostium primum defects tend to present earlier and are often associated with endocardial cushion defects and defective mitral or tricuspid valves. In such cases, valve replacement may be necessary and the extended operation has a considerable chance of mortality.
- Increasingly closure by a transcatheter device closure has been applied.
- Repair of atrial septal defects on the perfused beating heart (atrial septal defect size 2 cm - 4.5 cm) [3]
International Classification of Diseases
The International Classification of Diseases (ICD) World Health Organization's classification used worldwide as the standard diagnostic tool for epidemiology, health management and clinical purposes. This includes the analysis of the general health situation of population groups. It is used to monitor the incidence and prevalence of diseases and other health problems. Within this classification "congenital malformations, deformations and chromosomal abnormalities" are (Q00-Q99) but excludes "inborn errors of metabolism" (E70-E90).
Congenital malformations of the circulatory system (Q20-Q28)
- ICD-10 Code: Q21.1 Atrial septal defect
Q21 Congenital malformations of cardiac septa
Excl.: acquired cardiac septal defect (I51.0)
- Q21.0 Ventricular septal defect
- Q21.1 Atrial septal defect Coronary sinus defect Patent or persistent: foramen ovale ostium secundum defect (type II) Sinus venosus defect
- Q21.2 Atrioventricular septal defect Common atrioventricular canal Endocardial cushion defect Ostium primum atrial septal defect (type I)
- Q21.3 Tetralogy of Fallot Ventricular septal defect with pulmonary stenosis or atresia, dextroposition of aorta and hypertrophy of right ventricle.
- Q21.4 Aortopulmonary septal defect Aortic septal defect Aortopulmonary window
- Q21.8 Other congenital malformations of cardiac septa Eisenmenger's defect Pentalogy of Fallot Excl.: Eisenmenger's complex (I27.8) syndrome (I27.8)
- Q21.9 Congenital malformation of cardiac septum, unspecified Septal (heart) defect NOS
Cardiovascular Abnormalities
Heart defects and preterm birth are the most common causes of neonatal and infant death. The long-term development of the heart combined with extensive remodelling and post-natal changes in circulation lead to an abundance of abnormalities associated with this system.
A UK study literature showed that preterm infants have more than twice as many cardiovascular malformations (5.1 / 1000 term infants and 12.5 / 1000 preterm infants) as do infants born at term and that 16% of all infants with cardiovascular malformations are preterm. (0.4% of live births occur at greater than 28 weeks of gestation, 0.9% at 28 to 31 weeks, and 6% at 32 to 36 weeks. Overall, 7.3% of live-born infants are preterm)[4]
"Baltimore-Washington Infant Study data on live-born cases and controls (1981-1989) was reanalyzed for potential environmental and genetic risk-factor associations in complete atrioventricular septal defects AVSD (n = 213), with separate comparisons to the atrial (n = 75) and the ventricular (n = 32) forms of partial AVSD. ...Maternal diabetes constituted a potentially preventable risk factor for the most severe, complete form of AVSD." [5]
In addition, there are in several congenital abnormalities that exist in adults (bicuspid aortic valve, mitral valve prolapse, and partial anomalous pulmonary venous connection) which may not be clinically recognized.
References
Articles
<pubmed>22252195</pubmed> <pubmed>22219470</pubmed> <pubmed>22097699</pubmed> <pubmed>22066780</pubmed> <pubmed>21545985</pubmed>
Search Pubmed
Search Pubmed: Atrial Septal Defect
External Links
External Links Notice - The dynamic nature of the internet may mean that some of these listed links may no longer function. If the link no longer works search the web with the link text or name. Links to any external commercial sites are provided for information purposes only and should never be considered an endorsement. UNSW Embryology is provided as an educational resource with no clinical information or commercial affiliation.
- OMIM Atrial Septal Defect
- Medline Plus ASD Repair Video
Glossary Links
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Cite this page: Hill, M.A. (2024, June 16) Embryology Cardiovascular System - Atrial Septal Defects. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Cardiovascular_System_-_Atrial_Septal_Defects
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G