Regressive autism

Regressive autism occurs when a child appears to develop typically but then starts to lose speech and social skills, generally at about the age of sixteen to eighteen months, and is subsequently diagnosed with autism. Other terms used to describe regression in children with autism are autism with regression, autistic regression, setback-type autism, and acquired autistic syndrome.cite journal |author=Halsey NA, Hyman SL, Converence Writing Panel |title= Measles-mumps-rubella vaccine and autistic spectrum disorder: Report from the New Challenges in Childhood Immunizations Conference convened in Oak Brook, Illinois, June 12–13, 2000 |journal=Pediatrics |volume=107 |issue=5 |pages=e84 |year=2001 |pmid=11331734 |url=http://pediatrics.aappublications.org/cgi/content/full/107/5/e84 |doi= 10.1542/peds.107.5.e84] There is no standard definition for regression, and the prevalence of regression varies depending on the definition used.

peech and social regression

Approximately 25–30% of children with autism spectrum disorders stop speaking after beginning to say words, often before the age of two.cite journal |author=Johnson CP, Myers SM |title=Identification and evaluation of children with autism spectrum disorders |journal=Pediatrics |volume=120 |issue=5 |pages=1183–215 |year=2007 |pmid=17967920 |doi=10.1542/peds.2007-2361|url=http://pediatrics.aappublications.org/cgi/content/full/120/5/1183] According to Ami Klin, "Most examples of autistic regression...are based upon a child's loss of a handful of words...it's possible that these children were only echoing sounds they heard from their parents"(Hughes, V. 2008). Some children lose social development instead of language; some lose both.cite journal |journal= Ambul Pediatr |date=2008 |volume=8 |issue=1 |pages=25–31 |title= Regression in autism: prevalence and associated factors in the CHARGE study |author= Hansen RL, Ozonoff S, Krakowiak P "et al." |doi=10.1016/j.ambp.2007.08.006 |pmid=18191778 |doi_brokendate= 2008-06-23] After the regression, the child follows the standard pattern of autistic neurological development. The term refers to the appearance that neurological development has reversed; it is actually only the affected developmental skills, rather than the neurology as a whole, that regresses. It is more usual for autistic neurological development to not include such aberrations, with age-appropriate autistic symptoms being clear from birth.

Skill loss may be quite rapid, or may be slow and preceded by a lengthy period of no skill progression; the loss may be accompanied by reduced social play or increased irritability. The temporarily acquired skills typically amount to a few words of spoken language, and may include some rudimentary social perception. In some cases a child will go through a period of learning new words at the cost of losing previously acquired words.

Causation controversy

Regression in autism spectrum disorders is well documented; attribution of regression to environmental stress factors may result in a delay in diagnosis. The apparent onset of regressive autism is surprising and distressing to parents, who often initially suspect severe hearing loss. The pattern of symptoms naturally leads many to suspect that postnatal environmental factors trigger autism; frequently, the apparent factor cited by parents is the possibility of vaccine injury. In particular, because obvious symptoms often start just after children receive multiple vaccinations, such as the MMR vaccine or the MMRV vaccine (MMR plus varicella (chickenpox) vaccine), some people perceive a causal link between vaccination and autism, especially if accompanied by a fever, rash, and rapid skill loss. Although a rancorous controversy has escalated since the earliest reports of a possible link began to surface in the 1980s, no link has been found with vaccines.cite journal |author= Richler J, Luyster R, Risi S "et al." |title= Is there a 'regressive phenotype' of Autism Spectrum Disorder associated with the measles-mumps-rubella vaccine? a CPEA study |journal= J Autism Dev Disord |volume=36 |issue=3 |pages=299–316 |year=2006 |pmid=16729252 |doi=10.1007/s10803-005-0070-1] There are also studies being done to test if certain types of regressive autism have an autoimmune basis. These studies show that some children are unable to absorb food due to a genetic disorder of their small intestine (see [autistic enterocolitis). These children seem to respond to treatment. (Vogin, G. D. 2002)

Research

There are some who believe that regressive autism is simply early-onset autism that was recognized at a later date. Researchers have conducted studies to determine whether regressive autism is a distinct subset of autism spectrum disorders. Over the years, the results of these studies have contradicted one another. Some researchers believe there is still nothing to support a definitive biological difference between early-onset and regressive autism. Some view all autism as regressive, a possibility examined in studies involving younger siblings of children with autism.

Other disorders involving regression

Other disorders that involve regression are total blindness from birth, childhood disintegrative disorder, Rett syndrome and Landau-Kleffner syndrome. [cite journal |author=Rogers SJ |title=Developmental regression in autism spectrum disorders |journal= Ment Retard Dev Disabil Res Rev |volume=10 |issue=2 |pages=139–43 |year=2004 |pmid=15362172 |doi=10.1002/mrdd.20027]

References

* Hughes, V. (2008, May 16). SFARI. Retrieved August 6, 2008, from Simons Foundation: http://sfari.org/news/contradictory-results-on-regressive-autism-divide-researchers
* Vogin, G. D. (2002, April 30). Regressive Autism May Be Linked to Autoimmune Enteropathy. Medscape Medical News, Retrieved August 6, 2008, from http://www.medscape.com/viewarticle/432692