[Note: This is one of the letters that I posted to my friends and family on
Facebook when we received Wyatt's inter-utero AVSD diagnosis and learned
that there was a 75% chance of him having a chromosomal abnormality,
probably Down syndrome. These are rough, these are raw. They are
painful... and totally didn't have to be if I had any understanding
about what DS was in the first place. It is these early days that
prompted me to start Down Wit Dat... to educate and to effect change.
Down syndrome is not something that needs to be grieved. Ever. -Jxox]
Well, today is a "special" day as my son would say. Today is the ultrasound in the high risk clinic where we scan my little Wyatt for any and all "soft" markers for chromosomal problems. These clues are known as soft simply because their presence isn't diagnostic, but rather potentially indicative at best. There are also a lot of ratios and probabilities to consider. To be honest, the math makes my head hurt.Once again, for those of you playing along: Trisomy 21 is probably better known to you as Down syndrome. We all generally have an idea of what this entails, but here's the Wikilink anyway:
http://en.wikipedia.org/wiki/Down_syndrome .
Trisomy 18 known as Edward's Syndrome. It has a very low survival rate. http://en.wikipedia.org/wiki/Trisomy_18 .
Trisomy 13 is also known as Patau Syndrome. It also has a very low survival rate. http://en.wikipedia.org/wiki/Patau_syndrome .
Quite a few of you have asked what some of the markers are, and I will do my best to provide an answer, if not a link that explains it clearer and more concisely than I would. So, saddle up and get yer learn on.
These markers are generally used early for screening purposes:
ECHOGENIC INTRACARDIAC FOCUS
http://en.wikipedia.org/wiki/Echogenic_intracardiac_focus
Basically a mineral deposit in the heart that may or may not appear bone like. 88% are only in the left ventricle, 5% are only in the right, and 7% are biventricular. It is suggested by current research that the biventricular, right sided, and generally less popular types are more indicative of chromosomal abnormality
Dilation of the kidney where the ureter meets it. This can happen on it's own, however in the presence of other markers, it become significant.
There are supposed to be two arteries and one vein in the umbilical cord; the arteries take away the deoxygenated blood from the baby to the placenta. Alone, it is not indicative of chromosomal defects, yet it has been associated with renal and cardiac problems. Together with other markers, it increases the risk of finding a chromosonal problem.
This is the fetus' bowel showing up as bright as bone on the ultrasound. Alone, it has been associated with cystic fibrosis, infection, bowl malformation, intra-amniotic bleeding and intra-uterine growth retardation. Together wih other markers, it shows an increased risk for Trisomies 13, 18, and 21.
Here we are with our friend the nuchal transparency again. Since this is done earlier in the pregnancy, I don't think it will be looked at today. One more thing of note: it was explained to me by a nurse very much in the know that since Wyatt and Zoe's were done much earlier than Quinn's, the results are a little more significant (ie: larger numbers on a smaller baby). Alone, it can also be indicative of congenital heart defects (which we knowWyatt has already), or it can be a flag for DS. There has also been associations with other abnormalities that are not chromosonal in nature (ie: skeletal, etc).
Dilation of the ventricles in the brain. Does occur on it's own, but incidence with Down syndrome (Trisomy 21) is very much increased. Can resolve on it's own as well, although unlikely.
Found on ultrasound between 14 and 24 weeks gestation. 50% of fetuses that have this have Trisomy 18; inversely 10% of those with Trisomy 18 will have this as the only marker. As far as I know, this has not been identified in our case.
http://www.radswiki.net/main/index.php?title=Mega_cisterna_magna
This part of the brain collects cerebral spinal fluid. When dilated without the presence of ventriculomegality (but with the presence of other markers) it is indicative of Trisomy 18. It is also rarely seen in the presence of other, non chromosomal disorders.
These markers are very useful in later comprehensive ultrasound (that I will be having today):
http://en.wikipedia.org/wiki/Human_skeleton
A bending or kink in the fifth or "pinkie" finger towards the rest of the fingers. This is found in 60% of people with Down syndrome. However, it can be found isolated in the general population as well.
Basically the foot looks like a rocker on a rocking chair. This is generally found with Trisomies 13 and 18.
These markers that have NOT been established for practice (due to lack of research, mainly) but might be useful:
A flattening of the head. Unreliable as there isn't enough variance between "normal" and Trisomy 21. More research is needed as there may be a link for Trisomy 18.
It has been noted that there appears to be an increased incidence in flared iliac bones in Trisomy 21. More research is needed in the general population.
SMALL EAR LENGTH
Infants with chromosonal abnormalities generally have small, low set ears. It's a bit tricky to see on an ultrasound, but ear length can be seen occasionally.
Other findings that we (thankfully!) have not run across:
A protrusion of intestines, liver, etc OUTSIDE of the fetus' body. Occurs with Trisomy 13 and 18.
Can occur with or without genetic involvement.
Extra fingers and/or toes.
And there are more, such as clubfoot, overlapping fingers, clenched fists, etc, etc, etc. I unfortunately do not have the statistics on these.
*************************************
Whew! That's a lot to absorb and I hope it helped. I hope the ultrasound brings us a little piece of mind as well as this is the stuff that keeps me awake at night. Once again, it doesn't always pay to be a nurse...
As a good friend of mine pointed out the other day "hang on to hope... that's what it's there for".
Trust me, we plan to.
Well, today is a "special" day as my son would say. Today is the ultrasound in the high risk clinic where we scan my little Wyatt for any and all "soft" markers for chromosomal problems. These clues are known as soft simply because their presence isn't diagnostic, but rather potentially indicative at best. There are also a lot of ratios and probabilities to consider. To be honest, the math makes my head hurt.Once again, for those of you playing along: Trisomy 21 is probably better known to you as Down syndrome. We all generally have an idea of what this entails, but here's the Wikilink anyway:
http://en.wikipedia.org/wiki/Down_syndrome .
Trisomy 18 known as Edward's Syndrome. It has a very low survival rate. http://en.wikipedia.org/wiki/Trisomy_18 .
Trisomy 13 is also known as Patau Syndrome. It also has a very low survival rate. http://en.wikipedia.org/wiki/Patau_syndrome .
Quite a few of you have asked what some of the markers are, and I will do my best to provide an answer, if not a link that explains it clearer and more concisely than I would. So, saddle up and get yer learn on.
These markers are generally used early for screening purposes:
ECHOGENIC INTRACARDIAC FOCUS
http://en.wikipedia.org/wiki/Echogenic_intracardiac_focus
Basically a mineral deposit in the heart that may or may not appear bone like. 88% are only in the left ventricle, 5% are only in the right, and 7% are biventricular. It is suggested by current research that the biventricular, right sided, and generally less popular types are more indicative of chromosomal abnormality
PYELECTASIS
http://en.wikipedia.org/wiki/PyelectasisDilation of the kidney where the ureter meets it. This can happen on it's own, however in the presence of other markers, it become significant.
SINGLE UMBILICAL ARTERY
http://en.wikipedia.org/wiki/Umbilical_arteryThere are supposed to be two arteries and one vein in the umbilical cord; the arteries take away the deoxygenated blood from the baby to the placenta. Alone, it is not indicative of chromosomal defects, yet it has been associated with renal and cardiac problems. Together with other markers, it increases the risk of finding a chromosonal problem.
ECHOGENIC BOWEL
http://www.ehow.com/about_5147504_echogenic-bowel-syndrome.htmlThis is the fetus' bowel showing up as bright as bone on the ultrasound. Alone, it has been associated with cystic fibrosis, infection, bowl malformation, intra-amniotic bleeding and intra-uterine growth retardation. Together wih other markers, it shows an increased risk for Trisomies 13, 18, and 21.
THICKENED NUCHAL FOLD
http://en.wikipedia.org/wiki/Nuchal_scanHere we are with our friend the nuchal transparency again. Since this is done earlier in the pregnancy, I don't think it will be looked at today. One more thing of note: it was explained to me by a nurse very much in the know that since Wyatt and Zoe's were done much earlier than Quinn's, the results are a little more significant (ie: larger numbers on a smaller baby). Alone, it can also be indicative of congenital heart defects (which we knowWyatt has already), or it can be a flag for DS. There has also been associations with other abnormalities that are not chromosonal in nature (ie: skeletal, etc).
VENTRICULOMEGALY (MILD)
http://en.wikipedia.org/wiki/VentriculomegalyDilation of the ventricles in the brain. Does occur on it's own, but incidence with Down syndrome (Trisomy 21) is very much increased. Can resolve on it's own as well, although unlikely.
CHOROID PLEXUS CYSTS
http://en.wikipedia.org/wiki/Choroid_plexus_cystsFound on ultrasound between 14 and 24 weeks gestation. 50% of fetuses that have this have Trisomy 18; inversely 10% of those with Trisomy 18 will have this as the only marker. As far as I know, this has not been identified in our case.
ENLARGED CISTERNA MAGNA
http://en.wikipedia.org/wiki/Cisterna_magna http://www.radswiki.net/main/index.php?title=Mega_cisterna_magna
This part of the brain collects cerebral spinal fluid. When dilated without the presence of ventriculomegality (but with the presence of other markers) it is indicative of Trisomy 18. It is also rarely seen in the presence of other, non chromosomal disorders.
These markers are very useful in later comprehensive ultrasound (that I will be having today):
http://en.wikipedia.org/wiki/Human_skeleton
SHORT FEMUR LENGTH
Useful in predicting Down syndrome. Also occurs with situations such as Fetal Growth Retardation.
SHORT HUMERUS LENGTH
See short femur length.
NASAL BONE
Absent or short nasal bones increase the risk of a Trisomy 21 finding.
CLINODACTYLY
http://en.wikipedia.org/wiki/ClinodactylyA bending or kink in the fifth or "pinkie" finger towards the rest of the fingers. This is found in 60% of people with Down syndrome. However, it can be found isolated in the general population as well.
ROCKER FOOT
http://en.wikipedia.org/wiki/Rocker_bottom_footBasically the foot looks like a rocker on a rocking chair. This is generally found with Trisomies 13 and 18.
These markers that have NOT been established for practice (due to lack of research, mainly) but might be useful:
BRACHYCEPHALY
http://en.wikipedia.org/wiki/BrachycephalyA flattening of the head. Unreliable as there isn't enough variance between "normal" and Trisomy 21. More research is needed as there may be a link for Trisomy 18.
INCREASED ILIAC ANGLE
http://en.wikipedia.org/wiki/Human_skeletonIt has been noted that there appears to be an increased incidence in flared iliac bones in Trisomy 21. More research is needed in the general population.
SMALL EAR LENGTH
Infants with chromosonal abnormalities generally have small, low set ears. It's a bit tricky to see on an ultrasound, but ear length can be seen occasionally.
SANDAL GAP
This is a separation of the big toe and the next (as flip flops or thong sandals would do to your foot). 45% of children with Trisomy 21 (DS) have this although the statistics vary. It is also unsure whether this occurs in the regular, non chromosonally abnormal population.Other findings that we (thankfully!) have not run across:
OMPHALOCELE
http://en.wikipedia.org/wiki/OmphaloceleA protrusion of intestines, liver, etc OUTSIDE of the fetus' body. Occurs with Trisomy 13 and 18.
CLEFT LIP/PALATE
http://en.wikipedia.org/wiki/Cleft_lipCan occur with or without genetic involvement.
MENINGOMYOCELE
http://en.wikipedia.org/wiki/Meningomyelocele
POLYDACTYLY
http://en.wikipedia.org/wiki/PolydactylyExtra fingers and/or toes.
And there are more, such as clubfoot, overlapping fingers, clenched fists, etc, etc, etc. I unfortunately do not have the statistics on these.
*************************************
Whew! That's a lot to absorb and I hope it helped. I hope the ultrasound brings us a little piece of mind as well as this is the stuff that keeps me awake at night. Once again, it doesn't always pay to be a nurse...
As a good friend of mine pointed out the other day "hang on to hope... that's what it's there for".
Trust me, we plan to.
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