Atrial Septal Defect (ASD): Difference between revisions

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==Atrial septal defect (ASD)==
==Atrial septal defect (ASD)==


In an atrial septal defect (ASD), a hole in the atrial septum is oxygen-rich blood that is flowing from LA to RV. The RA, RV and ultimately the lungs, therefore there is more volume of blood to process. ASD is a volume load on the RV.
In an atrial septal defect (ASD), a hole in the atrial septum is flowing oxygen-rich blood from LA to RV. The RA, RV and ultimately the lungs, therefore has more volume of blood to process. ASD is the volume load on the RV.


[[Image: |Video]]
[[Image: |Video]]
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{| class="wikitable" cellpadding="0" cellspacing="0" border="0" width="400px"
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|colspan="3"|'''ASD is to be divided into four types:'''
!colspan="3"|ASD is to be divided into four types:
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!Type  
!Type  
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ASD can manifest at any age . An ASD comes in 9 % of all congenital heart defects , but for the most common congenital heart disease that often only reflected ( 30 % ) in adulthood .
ASD can manifest at any age. An ASD comes in 9% of all congenital heart defects, but for the most common congenital heart disease often only reflects (30%) in adulthood.


{| class="wikitable" cellpadding="0" cellspacing="0" border="0" width="400px"
{| class="wikitable" cellpadding="0" cellspacing="0" border="0"
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|colspan="2"|'''Most common ASD'''
!colspan="2"|Most common ASD
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|ASD II  
|ASD II  
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|Rare
|Rare
|}
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==Patent Foramen Ovale (PFO)==
==Patent Foramen Ovale (PFO)==


A patent foramen ovale , abbreviated to PFO , has a functional defect in the atrial septum, in contrast to an ASD that has an anatomical defect. The septum primum and septum secundum develop from different edges in the embryonic atria . However , the septum secundum does not form a closed portion , there always remains an opening between the two septa. At birth, the inter- atrial pressure is changed and to be pressed against each other , the two septa . In 15-35 % of the population, there still remains a small opening . A PFO is in fact an incomplete fusion of the septum primum and septum secundum .
A patent foramen ovale, abbreviated to PFO, has a functional defect in the atrial septum, in contrast to an ASD that has an anatomical defect. The septum primum and septum secundum develop from different edges in the embryonic atria. However, the septum secundum does not form a closed portion, there always remains an opening between the two septa. At birth, the inter-atrial pressure is changed and is pressed against the two septa. In 15-35% of the population, there still remains a small opening. A PFO is in fact an incomplete fusion of the septum primum and septum secundum .


A PFO is involved with a number of other pathologies such as cerebrovascular accident ( CVA ) , Transient Ischemic Attack ( TIA ) , Caisson Disease ( Decompression sickness among divers ) , Platypneu - orthodeoxiesyndroom and Migraine . There is a direct relationship between the size of the shunt and the risk of stroke .
A PFO is involved with a number of other pathologies such as cerebrovascular accident (CVA), Transient Ischemic Attack (TIA) , Caisson Disease (Decompression sickness among divers) , Platypneu-orthodeoxiesyndrom and Migraine. There is a direct relationship between the size of the shunt and the risk of stroke .


A PFO can be demonstrated with the aid of contrast by means of a saline solution . There is a PFO if within three cardiac cycles to see a crossing from right to left after administration of contrast.
A PFO can be demonstrated with the aid of [[Saline Solution|contrast]] by means of a saline solution. There is a PFO if within three cardiac cycles you see a crossing from right to left after administration of contrast.


The number of bubbles in one frame can be categorized in size of opening:
The number of bubbles in one frame can be categorized in size of opening:


{| class="wikitable" cellpadding="0" cellspacing="0" border="0" width="400px"
{| class="wikitable" cellpadding="0" cellspacing="0" border="0"
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|colspan="2"|'''Size of PFO'''
!colspan="2"|Size of PFO
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|Narrow opening  
|Narrow opening  
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|Video
|Video
|-
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!Crossing contrast to PFO <cite>2</cite>
!Crossing contrast to PFO <cite>1</cite>
|}
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==Echocardiographic points==
==Echocardiographic points==


Considerations
{| class="wikitable" cellpadding="0" cellspacing="0" border="0"
Localization of defect
|-
Color Doppler + possible . contrast. Where in IAS ?
!colspan="2"|Considerations
|-
|Localization of defect
|Color doppler + possible contrast. Where in IAS?
|-
|Instructions for volume overload
|Dimensions RF + RA. Question of dilation?
|-
|Evidence of pulmonary hypertension
|SPAP. See high pressures?
|}


Instructions for volume load Dimensions RF + RA . Question of dilation ?
Click [http://csecho.ca/cardiomath/?eqnHD=echo&eqnDisp=qpqsecho '''here'''] for Qp/Qs calculation.
Evidence of pulmonary hypertension
SPAP . See high pressures ?


Click here for Qp / Qs calculation.
===Example of ASD===


Example of ASD
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Large ASD type II contrast crossing at ASD type II
|Video
 
|Video
ASD closure
|-
!Large ASD type II  
!Contrast crossing at ASD type II
|}


Closure of ASD occurs with Closure Device. Endocardial tissue grows over the device over .
===ASD closure===


Source : EC Cheriex , " Left atrium and investigated ," Hamer / Pieper , ' Practical echocardiography , (2006 ) , 1st edition 2nd edition, Wood , Bohn Stafleu of Loghum , p.42 -53 .
{| class="wikitable" cellpadding="0" cellspacing="0" border="0"
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|Video
|-
!Closure of ASD occurs with Closure Device. Endocardial tissue grows over the device. <cite>2</cite>
|}


==References==
==References==
<biblio>
<biblio>
#1
#1 pmid=21078836
#2 pmid=21078836
#2 EC Cheriex, "Left atrium and investigated", Hamer/Pieper, "Practical echocardiography", (2006), 1st edition 2nd edition, Wood, Bohn Stafleu of Loghum, p.42-53.
#3 [http://csecho.ca/cardiomath/?eqnHD=echo&eqnDisp=qpqsecho|Pulmonary-Systemic Flow Ratio (Qp/Qs)]
</biblio>
</biblio>

Latest revision as of 01:31, 11 January 2014

Atrial septal defect (ASD)

In an atrial septal defect (ASD), a hole in the atrial septum is flowing oxygen-rich blood from LA to RV. The RA, RV and ultimately the lungs, therefore has more volume of blood to process. ASD is the volume load on the RV.

[[Image: |Video]]

ASD is to be divided into four types:
Type Name Location
ASD type I Ostium primum defect In the basal septum t.p.v. atrioventricular ventricular transition
ASD type II Ostium secundum defect In the middle of the atrial septum, the fossa ovalis area.
ASD type III Sinus venosus defect At the entrance of both the VCS and the VCI
Coronary sinus defect Coronary sinus defect Compound coronary sinus with LA.

ASD can manifest at any age. An ASD comes in 9% of all congenital heart defects, but for the most common congenital heart disease often only reflects (30%) in adulthood.

Most common ASD
ASD II 70 %
ASD I 15 %
Sinus venosus defect 1 5 %
Coronary sinus defect Rare

Patent Foramen Ovale (PFO)

A patent foramen ovale, abbreviated to PFO, has a functional defect in the atrial septum, in contrast to an ASD that has an anatomical defect. The septum primum and septum secundum develop from different edges in the embryonic atria. However, the septum secundum does not form a closed portion, there always remains an opening between the two septa. At birth, the inter-atrial pressure is changed and is pressed against the two septa. In 15-35% of the population, there still remains a small opening. A PFO is in fact an incomplete fusion of the septum primum and septum secundum .

A PFO is involved with a number of other pathologies such as cerebrovascular accident (CVA), Transient Ischemic Attack (TIA) , Caisson Disease (Decompression sickness among divers) , Platypneu-orthodeoxiesyndrom and Migraine. There is a direct relationship between the size of the shunt and the risk of stroke .

A PFO can be demonstrated with the aid of contrast by means of a saline solution. There is a PFO if within three cardiac cycles you see a crossing from right to left after administration of contrast.

The number of bubbles in one frame can be categorized in size of opening:

Size of PFO
Narrow opening < 10 contrast bubbles in LA
Excessive opening 10-20 contrast bubbles in LA
Grand opening > 20 contrast bubbles in LA
Video
Crossing contrast to PFO [1]

Echocardiographic points

Considerations
Localization of defect Color doppler + possible contrast. Where in IAS?
Instructions for volume overload Dimensions RF + RA. Question of dilation?
Evidence of pulmonary hypertension SPAP. See high pressures?

Click here for Qp/Qs calculation.

Example of ASD

Video Video
Large ASD type II Contrast crossing at ASD type II

ASD closure

Video
Closure of ASD occurs with Closure Device. Endocardial tissue grows over the device. [2]

References

  1. Davison P, Clift PF, and Steeds RP. The role of echocardiography in diagnosis, monitoring closure and post-procedural assessment of patent foramen ovale. Eur J Echocardiogr. 2010 Dec;11(10):i27-34. DOI:10.1093/ejechocard/jeq120 | PubMed ID:21078836 | HubMed [1]
  2. EC Cheriex, "Left atrium and investigated", Hamer/Pieper, "Practical echocardiography", (2006), 1st edition 2nd edition, Wood, Bohn Stafleu of Loghum, p.42-53.

    [2]