shihui
Forum Newbie
Topics: 10
Posts: 17
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I found these confusing terms
ostium primum
ostium secundum
septum primum
septum secundum
foramen primum
foramen secundum
formen ovale
My understanding is as followings:
Ostium primum is the original communication(not a division)between the two atrium.
then,septum primum starts to grow down from the upper(cranial) and the fuse with the endocardial cushion.But it has a hole(ostium secundum),which permits the right-to-left blood flow. Foramen secundum is another hole formed in the upper portion of the septum prium.
next, Septum secundum forms to the right of the septum primum and fuses with septum primum. The foramen ovale is the opening on it.
Am I correct? and what's foramen primum and foramen secundum?
thanks for clearfication.
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| vk99
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Well ..This is my understanding..Septum primum first grows down towards the AV septum and does not fuse for a while with the AV septum ..the gap in between them is the foramen primum, then foramen secundum is a hole in the septum primum...Then come septum secundum just right to septum primum and a hole in this septum secundum is the foramen ovale....Both septum primum and septum secundum fuse to form atrial septum
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| shihui
Forum Newbie
Topics: 10
Posts: 17
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ostium primum type or septum primum type?
what's the difference?
thanks.
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| vk99
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I guess Ostium and foramen are the same ...both mean a "hole".....Next comming to the most common type of ASD: Ostium secundum is the most common type but it is not so dangerous/serious....Next the most dangerous one is the ostium primum type...remember since it forms near the cusions, it basically fools around at a level of mitral and tricuspid valves making it more complicated....Hope i discussed what you wanted here...good luck
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| shihui
Forum Newbie
Topics: 10
Posts: 17
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FA said it is the most common type in Down's syndrom ASD. Is it common to general population?
thanks again
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