Down syndrome history and symptoms
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Down syndrome is a congenital disorder. The symptoms of Down syndrome appear vary from person to person and range between mild to severe. The children with Down syndrome generally have a recognized appearance. The head is usually smaller than normal and abnormally shaped. For example, the head may be round with a flat area on the back. The inner corner of the eyes is usually round rather pointed. Children may also have delayed mental and social development.
History and Symptoms
Down syndrome is a congenital disorder. The symptoms of Down syndrome appear vary from person to person and range between mild to severe. The children with Down syndrome generally have a recognized appearance. The head is usually smaller than normal and abnormally shaped. For example, the head may be round with a flat area on the back. The inner corner of the eyes is usually round rather pointed.
- Common physical signs of down syndrome include:
- Decreased muscle tone at birth
- Separated joints between the bones of the skull (sutures)
- Upward slanting eyes
- Small ears
- Flattened nose
- Small mouth
- Excess skin at the nape of the neck
- Wide, short hands with short fingers
- Single crease in the palm of the hand
- Brushfield spots on eyes
- Physical development is often slower than normal
- Most children with Down syndrome never reach their average adult height
- Children may also have delayed mental and social development, common problems may include:
- Short attention span
- Poor judgment
- Slow learning
- Impulsive behavior
- As children with Down syndrome age and become receptive about their limitations, they may get irritable and frustrated.
The systemic abnormalities in the patient of down syndrome include:
- Birth defects involving the heart:
- Atrial septal defect
- Ventricular septal defect
- Most children with Down syndrome require glasses
- Early and massive vomiting
- Esophageal atresia
- Duodenal atresia
- Chronic constipation
- Regular ear infections
- Hearing impairment
- Risk of hip dislocation
- Sleep apnea (because the mouth, throat, and airway are narrowed in children with Down syndrome)
- Teeth that appear later in life are abnormally located and may cause difficulty in chewing
- The condition is characterized by a combination of major and minor differences in structure. Often Down syndrome is associated with some impairment of cognitive ability and physical growth as well as facial appearance. Down syndrome can be identified during pregnancy or at birth.
- Individuals with Down syndrome can have a lower than average cognitive ability, often ranging from mild to moderate learning disabilities. Developmental disabilities often manifest as a tendency toward concrete thinking. A small number have severe to profound mental disability.
- Individuals with Down syndrome may have some or all of the following physical characteristics: oblique eye fissures with epicanthic skin folds on the inner corner of the eyes, muscle hypotonia (poor muscle tone), a flat nasal bridge, a single palmar fold, a protruding tongue (due to small oral cavity, and an enlarged tongue near the tonsils), a short neck, white spots on the iris known as Brushfield spots, excessive flexibility in joints, congenital heart defects, excessive space between large toe and second toe, a single flexion furrow of the fifth finger, and a higher number of ulnar loop dermatoglyphs. Most individuals with Down syndrome have mental retardation in the mild (IQ 50–70) to moderate (IQ 35–50) range, with scores of children having Mosaic Down syndrome (explained below) typically 10–30 points higher. In addition, individuals with Down syndrome can have serious abnormalities affecting any body system.
- Cognitive development in children with Down syndrome is quite variable. It is not currently possible at birth to predict the capabilities of any individual reliably, nor are the number or appearance of physical features predictive of future ability. The identification of the best methods of teaching each particular child ideally begins soon after birth through early intervention programs. Since children with Down syndrome have a wide range of abilities, success at school can vary greatly, which stresses the importance of evaluating children individually. The cognitive problems that are found among children with Down syndrome can also be found among typical children. Therefore, parents can use general programs that are offered through the schools or other means. Language skills show a difference between understanding speech and expressing speech. It is not uncommon for children with Down Syndrome to have a speech delay, although it is common for them to need speech therapy to help with expressive language. Fine motor skills are delayed and often lag behind gross motor skills and can interfere with cognitive development. Gross Motor Skills can be affected anywhere from minor to major. Some children will walk at around 2 while others around 4. A physical therapist or APE will help a child with this. 
- Speech therapy is usually performed because of the enlarged tongue which many children with Down Syndrome have, which makes clear speech difficult. Speech therapy and immersion in social situations where conversation is common and extended can result in excellent language development. Unfortunately, relatively little is done in early intervention programs to foster cognitive development. A good Montessori school may be an excellent environment for fostering learning in individuals with Down Syndrome.   Significant work on cognitive development has been done by Dr. Raymundo Veras of Brazil. Dr. Veras worked from the model of early childhood education established by Glenn Doman of the Institutes for the Achievement of Human Potential, in Philadelphia. As a result of his work, he wrote a book entitled Children of Dreams, Children of Hope, in which he recounts demonstrating to Mr. Doman a preschool age girl who was able to read in four languages and play the violin.   Children with Down Syndrome often have an enhanced ability to memorize songs, stories, vocabulary, and other language material, which can be capitalized upon. 
- In education, mainstreaming of children with Down syndrome is becoming less controversial in many countries. For example, there is a presumption of mainstream in many parts of the UK. Mainstreaming is the process whereby students of differing abilities are placed in classes with their chronological peers. Children with Down syndrome may not age emotionally/socially and intellectually at the same rates as children without Down syndrome, so over time the intellectual and emotional gap between children with and without Down syndrome may widen. Complex thinking as required in sciences but also in history, the arts, and other subjects can often be beyond the abilities of some, or achieved much later than in other children. Therefore, children with Down syndrome may benefit from mainstreaming provided that some adjustments are made to the curriculum.
- Some European countries such as Germany and Denmark advise a two-teacher system, whereby the second teacher takes over a group of children with disabilities within the class. A popular alternative is cooperation between special schools and mainstream schools. In cooperation, the core subjects are taught in separate classes, which neither slows down the typical students nor neglects the students with disabilities. Social activities, outings, and many sports and arts activities are performed together, as are all breaks and meals.
- The medical consequences of the extra genetic material in Down syndrome are highly variable and may affect the function of any organ system or bodily process. The health aspects of Down syndrome encompass anticipating and preventing effects of the condition, recognizing complications of the disorder, managing individual symptoms, and assisting the individual and his/her family in coping and thriving with any related disability or illnesses.
- The most common manifestations of Down syndrome are the characteristic facial features, cognitive impairment, congenital heart disease (typically a ventricular septal defect), hearing deficits (maybe due to sensory-neural factors, or chronic serous otitis media, also known as Glue-ear), short stature, thyroid disorders, and Alzheimer's disease. Other less common serious illnesses include leukemia, immune deficiencies, and epilepsy. However, health benefits of Down syndrome include greatly reduced incidence of many common malignancies except leukemia and testicular cancer — although it is, as yet, unclear whether the reduced incidence of various fatal cancers among people with Down syndrome is as a direct result of tumor-suppressor genes on chromosome 21, because of reduced exposure to environmental factors that contribute to cancer risk, or some other as-yet unspecified factor. Down syndrome can result from several different genetic mechanisms. This results in a wide variability in individual symptoms due to complex gene and environment interactions. Prior to birth, it is not possible to predict the symptoms that an individual with Down syndrome will develop. Some problems are present at birth, such as certain heart malformations. Others become apparent over time, such as epilepsy.
- These factors can contribute to a significantly shorter lifespan for people with Down syndrome. One study, carried out in the United States in 2002, showed an average lifespan of 49 years, with considerable variations between different ethnic and socio-economic groups.
- Fertility amongst both males and females is reduced, with only three recorded instances of males with Down syndrome fathering children.
Endocrinology and hematology
- Individuals with DS are at increased risk for dysfunction of the thyroid gland, an organ which helps control metabolism. Low thyroid (hypothyroidism) is most common, occurring in almost a third of those with DS. This can be due to absence of the thyroid at birth (congenital hypothyroidism) or due to attack on the thyroid by the immune system. Reproduction is also affected by DS. Women with DS are less fertile and often have difficulties with miscarriage, premature birth, and difficult labor. However, women with DS are capable of having children without the extra chromosome 21 of DS. Men with DS are almost uniformly infertile, exhibiting defects in spermatogenesis.
- Hematologic malignancies such as leukemia are more common in children with DS. In particular, the risk for acute lymphoblastic leukemia is at least 10 times more common in DS and for the megakaryoblastic form of acute myelogenous leukemia is at least 50 times more common in DS. Transient leukemia is a form of leukemia which is rare in individuals without DS but affects up to 20 percent of newborns with DS. This form of leukemia is typically benign and resolves on its own over several months, though it can lead to other serious illnesses. In contrast to hematologic malignancies, solid tumor malignancies are less common in DS, possibly due to increased numbers of tumor suppressor genes contained in the extra genetic material.
Gastrointestinal and growth
- Down syndrome increases the risk of Hirschsprung's disease, in which the nerve cells that control the function of parts of the colon are not present. This results in severe constipation. Other congenital anomalies occurring more frequently in DS include duodenal atresia, annular pancreas, and imperforate anus. Gastroesophageal reflux disease and celiac disease are also more common among people with DS.
- Growth parameters such as height, weight, and head circumference are smaller in children with DS than with individuals of the same age. Adults with DS tend to have short stature — the average height for men is 5 feet 1 inch (157 cm) and for women is four feet 9 inches (144 cm). Individuals with DS are also at increased risk for obesity as they age.
- Persons with down syndrome are at higher than normal risk for atlanto-axial instability, probably due to ligamental laxity. Periodic screening, with cervical x-rays, is recommended to identify this abnormality.
- The neurologic consequences of DS manifest early in life. Infants with Down Syndrome have a decreased muscle tone and are more flexible. Mental retardation becomes apparent as individuals with DS grow and develop — sitting, walking, and talking are typically delayed. Children and adults with DS are at increased risk for developing epilepsy. The risk for Alzheimer's disease is increased in individuals with DS, with 10-25% of individuals with DS showing signs of AD before age 50, up to 50% with clinical symptoms in the sixth decade, and up to 75% in the 7th decade. This sharp increase in the incidence and prevalence of dementia may be one of the factors driving the decreased life expectancy of persons with Down Syndrome.
Ophthalmology and otolaryngology
- Eye disorders are more common in people with DS. Almost half have strabismus, in which the two eyes do not move in tandem. Refractive errors requiring glasses or contacts are also common. Cataracts (opacity of the lens) and glaucoma (increased eye pressures) are also more common in DS.
- Hearing loss affects more than half of individuals with DS, due to multiple factors. Frequent infections of the middle ear (otitis media) and obstructive sleep apnea are also more common DS. Instability of the atlanto-axial joint occurs in ~15% of people with DS and may lead to the neurologic symptoms of spinal cord compression.
- ↑ Ropper, A. H.; Williams, R. S. (1980). "Relationship between plaques, tangles, and dementia in Down syndrome". Neurology. 30 (6): 639–639. doi:10.1212/WNL.30.6.639. ISSN 0028-3878.
- ↑ "Definition of Brushfield's Spots".
- ↑ "Keep Kids Healthy article on Down syndrome". Unknown parameter
- ↑ Strom, C. "FAQ from Mosaic Down Syndrome Society". Retrieved 2006-06-03.
- ↑ "Dear New or Expectant Parents". National Down Syndrome Society. Retrieved 2006-05-12. Also "Research projects - Early intervention and education". Retrieved 2006-06-02.
- ↑ Bird, G. and S. Thomas (2002). "Providing effective speech and language therapy for children with Down syndrome in mainstream settings: A case example". Down Syndrome News and Update. 2 (1): 30–31. Also, Kumin, Libby (1998). "Comprehensive speech and language treatment for infants, toddlers, and children with Down syndrome". In Hassold, T.J.and D. Patterson. Down Syndrome: A Promising Future, Together. New York: Wiley-Liss.
- ↑ "Development of Fine Motor Skills in Down Syndrome". Retrieved 2006-07-03.
- ↑ M. Bruni. "Occupational Therapy and the Child with Down Syndrome". Retrieved 2006-06-02.
- ↑ "Down Syndrome Information".
- ↑ "Berkeley Parents Network". Retrieved 2007-10-02.
- ↑ "Instituto Véras". Retrieved 2007-10-02.
- ↑ "The Institutes for the Achievement of Human Potential". Retrieved 2007-10-02.
- ↑ "Down Syndrome".
- ↑ S.E.Armstrong. "Inclusion: Educating Students with Down Syndrome with Their Non-Disabled Peers". Retrieved 2006-05-12. Also, see Debra L. Bosworth. "Benefits to Students with Down Syndrome in the Inclusion Classroom: K-3". Retrieved 2006-06-12. Finally, see a survey by NDSS on inclusion, Gloria Wolpert (1996). "The Educational Challenges Inclusion Study". National Down Syndrome Society. Retrieved 2006-06-28.
- ↑ There are many such programs. One is described by Action Alliance for Children, Template:Web cite Also, see Template:Web cite
- ↑ American Academy of Pediatrics Committee on Genetics (2001). "American Academy of Pediatrics: Health supervision for children with Down syndrome". Pediatrics. 107 (2): 442–449. PMID 11158488. Unknown parameter
- ↑ Yang Q, Rasmussen SA, Friedman JM. Mortality associated with Down's syndrome in the USA from 1983 to 1997: a population-based study. Lancet 2002 23 March;359(9311):1019–25. PMID 11937181
- ↑ Young, Emma (2002-03-22). "Down syndrome lifespan doubles". New Scientist. Retrieved 2006-10-14.
- ↑ Ying-Hui H. Hsiang, Gary D. Berkovitz, Gail L. Bland, Claude J. Migeon, Andrew C. Warren, John M. Opitz, James F. Reynolds (1987). "Gonadal function in patients with Down syndrome". American Journal of Medical Genetics. Wiley-Liss, Inc. 27 (2): 449–458. 10.1002/ajmg.1320270223.
- ↑ Sheridan R, Llerena J, Matkins S, Debenham P, Cawood A, Bobrow M (1989). "Fertility in a male with trisomy 21". J Med Genet. 26 (5): 294–8. PMID 2567354.
- ↑ Pradhan M, Dalal A, Khan F, Agrawal S (2006). "Fertility in men with Down syndrome: a case report". Fertil Steril. 86 (6): 1765.e1–3. PMID 17094988.
- ↑ Karlsson B, Gustafsson J, Hedov G, Ivarsson SA, Anneren G. Thyroid dysfunction in Down's syndrome: relation to age and thyroid autoimmunity. Arch Dis Child. 1998 Sep;79(3):242-5. PMID 9875020
- ↑ Bovicelli L, Orsini LF, Rizzo N, Montacuti V, Bacchetta M. Reproduction in Down syndrome. Obstet Gynecol. 1982 Jun;59(6 Suppl):13S-7S. PMID 6211644
- ↑ Johannisson R, Gropp A, Winking H, Coerdt W, Rehder H, Schwinger E. Down's syndrome in the male. Reproductive pathology and meiotic studies. Hum Genet. 1983;63(2):132-8. PMID 6220959
- ↑ Transient leukaemia--a benign form of leukaemia in newborn infants with trisomy 21. Br J Haematol. 2003 Mar;120(6):930-8. Review. PMID 12648061
- ↑ Hasle H, Clemmensen IH, Mikkelsen M. Risks of leukaemia and solid tumours in individuals with Down's syndrome. Lancet. 2000 Jan 15;355(9199):165-9. PMID 10675114
- ↑ Ikeda K, Goto S. Additional anomalies in Hirschsprung's disease: an analysis based on the nationwide survey in Japan. Z Kinderchir. 1986 Oct;41(5):279-81. PMID 2947399
- ↑ Zachor DA, Mroczek-Musulman E, Brown P. Prevalence of celiac disease in Down syndrome in the United States. J Pediatr Gastroenterol Nutr. 2000 Sep;31(3):275-9. PMID 10997372
- ↑ Cronk C, Crocker AC, Pueschel SM, Shea AM, Zackai E, Pickens G, Reed RB.Growth charts for children with Down syndrome: 1 month to 18 years of age. Pediatrics. 1988 Jan;81(1):102-10. PMID 2962062
- ↑ Rubin SS, Rimmer JH, Chicoine B, Braddock D, McGuire DE. Overweight prevalence in persons with Down syndrome. Ment Retard. 1998 Jun;36(3):175-81. PMID 9638037
- ↑ Goldberg-Stern H, Strawsburg RH, Patterson B, Hickey F, Bare M, Gadoth N, Degrauw TJ.Seizure frequency and characteristics in children with Down syndrome. Brain Dev. 2001 Oct;23(6):375-8. PMID 11578846
- ↑ Menendez M. Down syndrome, Alzheimer's disease and seizures. Brain Dev. 2005 Jun;27(4):246-52. Review. PMID 15862185
- ↑ Caputo AR, Wagner RS, Reynolds DR, Guo SQ, Goel AK. Down syndrome. Clinical review of ocular features. Clin Pediatr (Phila). 1989 Aug;28(8):355-8. PMID 2527102
- ↑ Roizen NJ, Wolters C, Nicol T, Blondis TA. Hearing loss in children with Down syndrome. J Pediatr. 1993 Jul;123(1):S9-12. PMID 8320600
- ↑ Clarke RW. Ear, nose and throat problems in children with Down syndrome. Br J Hosp Med (Lond). 2005 Sep;66(9):504-6. Review. PMID 16200785
- ↑ Pueschel SM, Scola FH. Atlantoaxial instability in individuals with Down syndrome: epidemiologic, radiographic, and clinical studies. Pediatrics. 1987 Oct;80(4):555-60. PMID 2958770