The Risk of Having a Baby With Down Syndrome Is Associated With Which One of the Following?

Down's syndrome is a status in which a person has an extra chromosome.

What is Down's syndrome?

Down's syndrome is a condition in which a person has an extra chromosome. Chromosomes are pocket-sized "packages" of genes in the trunk. They determine how a babe's trunk forms and functions every bit information technology grows during pregnancy and after birth. Typically, a baby is born with 46 chromosomes. Babies with Down syndrome take an extra copy of one of these chromosomes, chromosome 21. A medical term for having an extra copy of a chromosome is 'trisomy.' Down syndrome is also referred to as Trisomy 21. This extra re-create changes how the baby's body and brain develop, which can cause both mental and physical challenges for the babe.

Even though people with Down syndrome might act and wait similar, each person has different abilities. People with Down's syndrome usually have an IQ (a measure of intelligence) in the mildly-to-moderately depression range and are slower to speak than other children.

Some common concrete features of Down syndrome include:

• A flattened confront, particularly the span of the olfactory organ
• Almond-shaped eyes that camber up
• A short neck
• Small ears
• A natural language that tends to stick out of the mouth
• Tiny white spots on the iris (colored office) of the centre
• Small hands and anxiety
• A unmarried line beyond the palm of the hand (palmar pucker)
• Modest pinky fingers that sometimes bend toward the thumb
• Poor muscle tone or loose joints
• Shorter in height as children and adults

How Many Babies are Born with Down syndrome?

Down syndrome remains the most common chromosomal condition diagnosed in the Usa. Each yr, about 6,000 babies born in the U.s. accept Down syndrome. This means that Down syndrome occurs in about 1 in every 700 babies.¹

Types of Down Syndrome

There are 3 types of Down syndrome. People often tin can't tell the difference between each type without looking at the chromosomes considering the physical features and behaviors are similar.

• Trisomy 21: About 95% of people with Down syndrome have Trisomy 21.² With this type of Down syndrome, each cell in the body has 3 separate copies of chromosome 21 instead of the usual ii copies.
• Translocation Down syndrome: This type accounts for a small-scale percentage of people with Down syndrome (about 3%).ⁱⁱ This occurs when an extra part or a whole extra chromosome 21 is present, merely it is fastened or "trans-located" to a different chromosome rather than existence a split up chromosome 21.
• Mosaic Down's syndrome: This blazon affects about 2% of the people with Down syndrome.² Mosaic means mixture or combination. For children with mosaic Down syndrome, some of their cells take 3 copies of chromosome 21, but other cells take the typical two copies of chromosome 21. Children with mosaic Down syndrome may have the same features every bit other children with Down's syndrome. However, they may have fewer features of the condition due to the presence of some (or many) cells with a typical number of chromosomes.

Causes and Gamble Factors

• The actress chromosome 21 leads to the physical features and developmental challenges that tin occur among people with Down's syndrome. Researchers know that Down's syndrome is caused past an actress chromosome, but no one knows for sure why Down's syndrome occurs or how many different factors play a role.
• 1 factor that increases the take chances for having a babe with Down syndrome is the mother's age. Women who are 35 years or older when they become significant are more probable to accept a pregnancy affected by Down's syndrome than women who become pregnant at a younger age.^three-5However, the majority of babies with Down syndrome are born to mothers less than 35 years old, because there are many more than births among younger women.^half-dozen,7

Diagnosis

There are two bones types of tests available to discover Down syndrome during pregnancy: screening tests and diagnostic tests. A screening examination can tell a woman and her healthcare provider whether her pregnancy has a lower or college chance of having Downwards syndrome. Screening tests practice non provide an absolute diagnosis, just they are safer for the mother and the developing babe. Diagnostic tests can typically discover whether or not a baby will have Downwards syndrome, but they can be more risky for the mother and developing babe. Neither screening nor diagnostic tests can predict the full impact of Downward syndrome on a baby; no one tin can predict this.

Screening Tests

Screening tests often include a combination of a blood exam, which measures the amount of various substances in the female parent's blood (e.chiliad., MS-AFP, Triple Screen, Quad-screen), and an ultrasound, which creates a picture of the infant. During an ultrasound, one of the things the technician looks at is the fluid backside the baby'due south neck. Extra fluid in this region could signal a genetic problem. These screening tests can help decide the infant'due south risk of Down syndrome. Rarely, screening tests can give an abnormal result even when in that location is nothing wrong with the baby. Sometimes, the test results are normal and yet they miss a trouble that does be.

Diagnostic Tests

Diagnostic tests are usually performed later on a positive screening test in gild to confirm a Down syndrome diagnosis. Types of diagnostic tests include:

• Chorionic villus sampling (CVS)—examines fabric from the placenta
• Amniocentesis—examines the amniotic fluid (the fluid from the sac surrounding the infant)
• Percutaneous umbilical claret sampling (PUBS)—examines blood from the umbilical cord

These tests wait for changes in the chromosomes that would bespeak a Down syndrome diagnosis.

Other Wellness Problems

Many people with Down syndrome have the mutual facial features and no other major birth defects. Nonetheless, some people with Down syndrome might accept one or more major nascence defects or other medical problems. Some of the more mutual health bug among children with Down's syndrome are listed below.^eight

• Hearing loss
• Obstructive sleep apnea, which is a status where the person's breathing temporarily stops while asleep
• Ear infections
• Heart diseases
• Heart defects present at nascency

Wellness care providers routinely monitor children with Downwardly syndrome for these conditions.

Treatments

Down syndrome is a lifelong condition. Services early in life will often assist babies and children with Downwardly syndrome to better their physical and intellectual abilities. Near of these services focus on helping children with Down syndrome develop to their full potential. These services include speech, occupational, and physical therapy, and they are typically offered through early intervention programs in each state. Children with Downwards syndrome may also need extra help or attention in school, although many children are included in regular classes.

Other Resources

The views of these organizations are their ain and do not reflect the official position of CDC.

• Down syndrome Enquiry Foundation (DSRF)external icon
  DSRF initiates research studies to better understand the learning styles of those with Down syndrome.
• Global Down syndrome Foundationexternal icon
  This foundation is dedicated to significantly improving the lives of people with Down syndrome through research, medical intendance, education and advocacy.
• National Association for Down's syndromeexternal icon
  The National Clan for Down Syndrome supports all persons with Downwards syndrome in achieving their full potential. They seek to assistance families, educate the public, address social bug and challenges, and facilitate active participation.
• National Downward Syndrome Society (NDSS)external icon
  NDSS seeks to increase awareness and credence of those with Downwards syndrome.

References

1. Mai CT, Isenburg JL, Canfield MA, Meyer RE, Correa A, Alverson CJ, Lupo PJ, Riehle‐Colarusso T, Cho SJ, Aggarwal D, Kirby RS. National population‐based estimates for major birth defects, 2010–2014. Birth Defects Research. 2019; 111(xviii): 1420-1435.
2. Shin M, Siffel C, Correa A. Survival of children with mosaic Down syndrome. Am J Med Genet A. 2010;152A:800-1.
3. Allen EG, Freeman SB, Druschel C, et al. Maternal age and risk for trisomy 21 assessed past the origin of chromosome nondisjunction: a report from the Atlanta and National Down Syndrome Projects. Hum Genet. 2009 February;125(ane):41-52.
4. Ghosh Southward, Feingold E, Dey SK. Etiology of Downwards syndrome: Show for consistent clan among altered meiotic recombination, nondisjunction, and maternal age across populations. Am J Med Genet A. 2009 Jul;149A(seven):1415-xx.
5. Sherman SL, Allen EG, Bean LH, Freeman SB. Epidemiology of Down's syndrome. Ment Retard Dev Disabil Res Rev. 2007;13(3):221-7.
6. Adams MM, Erickson JD, Layde PM, Oakley GP. Down'due south syndrome. Contempo trends in the United states of america. JAMA. 1981 Aug 14;246(7):758-60.
7. Olsen CL, Cross PK, Gensburg LJ, Hughes JP. The effects of prenatal diagnosis, population ageing, and changing fertility rates on the live birth prevalence of Down's syndrome in New York State, 1983-1992. Prenat Diagn. 1996 Nov;16(11):991-1002.
8. Bull MJ, the Committee on Genetics. Health supervision for children with Down syndrome. Pediatrics. 2011;128:393-406.

cromwellhintrues72.blogspot.com

Source: https://www.cdc.gov/ncbddd/birthdefects/downsyndrome.html

Share this post