Pervasive developmental disorder
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This article needs additional citations for verification. (January 2008) |
| Pervasive developmental disorder | |
|---|---|
| Classification and external resources | |
| ICD-10 | F84 |
| ICD-9 | 299 |
| DiseasesDB | 33524 |
| eMedicine | ped/1780 |
| MeSH | D002659 |
The diagnostic category pervasive developmental disorders (PDD), as opposed to specific developmental disorders (SDD), refers to a group of five disorders characterized by delays in the development of multiple basic functions including socialization and communication. The pervasive developmental disorders are:[1]
- Pervasive developmental disorder not otherwise specified (PDD-NOS), which includes atypical autism, and is the most common;
- Autism, the best-known;
- Asperger syndrome;
- Rett syndrome; and
- Childhood disintegrative disorder (CDD).
The first three of these disorders are commonly called the autism spectrum disorders; the last two disorders are much rarer, and are sometimes placed in the autism spectrum and sometimes not.[2][3]
Parents may note symptoms of PDD as early as infancy and typically onset is prior to three years of age. PDD itself does not affect life expectancy.
There is a division among doctors on the use of the term PDD.[1] Many use the term PDD as a short way of saying PDD-NOS.[1] Others use the general category label of PDD because they are hesitant to diagnose very young children with a specific type of PDD, such as autism.[1] Both approaches contribute to confusion about the term, because the term PDD actually refers to a category of disorders and is not a diagnostic label.[1]
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Classification[edit]
The pervasive developmental disorders are:[1]
- Pervasive developmental disorder not otherwise specified (PDD-NOS), which includes atypical autism, and is the most common (47% of diagnoses);[4]
- Autism, the best-known;
- Asperger syndrome (9% of autism diagnoses);
- Rett syndrome; and
- Childhood disintegrative disorder (CDD).
The first three of these disorders are commonly called the autism spectrum disorders; the last two disorders are much rarer, and are sometimes placed in the autism spectrum and sometimes not.[2][3]
The release of DSM-5 in May 2013 is expected to remove PDD and be replaced with Autism Spectrum Disorders, and will not include all of the previously included disorders.[5][full citation needed]
PDD and PDD-NOS[edit]
There is a division among doctors on the use of the term PDD.[1] Many use the term PDD as a short way of saying PDD-NOS.[1] Others use the general category label of PDD because they are hesitant to diagnose very young children with a specific type of PDD, such as autism.[1] Both approaches contribute to confusion about the term, because the term PDD actually refers to a category of disorders and is not a diagnostic label.[1]
PDD is not itself a diagnosis, while PDD-NOS is a diagnosis. To further complicate the issue, PDD-NOS can also be referred to as "atypical personality development", "atypical PDD", or "atypical Autism".
Because of the "NOS", which means "not otherwise specified", it is hard to describe what PDD-NOS is, other than its being an autism spectrum disorder (ASD). Some people diagnosed with PDD-NOS are close to having Asperger syndrome, but do not quite fit. Others have near full fledged autism, but without some of its symptoms. The psychology field is considering creating several subclasses within PDD-NOS.
Symptoms[edit]
Symptoms of PDD may include communication problems such as:
- Difficulty using and understanding language
- Difficulty relating to people, objects, and events; for example, lack of eye contact, pointing behavior, and lack of facial responses
- Unusual play with toys and other objects
- Difficulty with changes in routine or familiar surroundings
- Repetitive body movements or behavior patterns, such as hand flapping, hair twirling, foot tapping, or more complex movements
- Unable to cuddle or be comforted
Degrees[edit]
Children with PDD vary widely in abilities, intelligence, and behaviors. Some children do not speak at all, others speak in limited phrases or conversations, and some have relatively normal language development. Repetitive play skills and limited social skills are generally evident as well. Unusual responses to sensory information – loud noises, lights – are also common.
Diagnosis[edit]
Diagnosis is usually done during early childhood. Some clinicians use PDD-NOS as a "temporary" diagnosis for children under the age of five when, for whatever reason, they are reluctant to diagnose autism. There are several justifications for this. Very young children have limited social interaction and communication skills to begin with, so it can be tricky to diagnose milder cases of autism in toddlers. The unspoken assumption is that by the age of five, unusual behaviors will either resolve or develop into diagnosable autism. However, some parents view the PDD label as no more than a euphemism for autism spectrum disorders, problematic because this label makes it more difficult to receive aid for early childhood intervention.
Care[edit]
Medications are used to address certain behavioral problems; therapy for children with PDD should be specialized according to the child's specific needs. Some children with PDD benefit from specialized classrooms in which the class size is small and instruction is given on a one-to-one basis. Others function well in standard special education classes or regular classes with support. Early intervention, including appropriate and specialized educational programs and support services, play a critical role in improving the outcome of individuals with PDD.
See also[edit]
- Autism and working memory
- Overactive Disorder Associated with Mental Retardation and Stereotyped Movements
- Specific developmental disorder
- Multiple-complex Developmental Disorder
- Multisystem Developmental Disorder
- Infantile neuroaxonal dystrophy, a rare and severe neurological disorder which shows developmental regression in infants and toddlers
References[edit]
This article incorporates public domain material from the National Institutes of Health document "NINDS Pervasive Developmental Disorders Information Page".
This article incorporates - ^ a b c d e f g h i j National Dissemination Center for Children with Disabilities (NICHCY) (October 2003) Disability Info: Pervasive Developmental Disorders (FS20). Fact Sheet 20 (FS20)
- ^ a b Lord C, Cook EH, Leventhal BL, Amaral DG (2000). "Autism spectrum disorders". Neuron 28 (2): 355–63. doi:10.1016/S0896-6273(00)00115-X. PMID 11144346.
- ^ a b Johnson CP, Myers SM, Council on Children with Disabilities (2007). "Identification and evaluation of children with autism spectrum disorders". Pediatrics 120 (5): 1183–215. doi:10.1542/peds.2007-2361. PMID 17967920. Lay summary – AAP (2007-10-29).
- ^ Jon Baio, EdS, National Center on Birth Defects and Developmental Disabilities, CDC (2012). "Prevalence of Autism Spectrum Disorders — Autism and Developmental Disabilities Monitoring Network, 14 Sites, United States, 2008".
- ^ Lord (2012). Missing or empty
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External links[edit]
- CDC's "Learn the Signs. Act Early." campaign - Information for parents on early childhood development and developmental disabilities
- NINDS Pervasive Developmental Disorders Information Page
- NICHCY fact sheet on Pervasive Developmental Disorder (note: not in the public domain)
- Information about Pervasive Developmental Disorders Yale Developmental Disabilities Clinic
- http://childstudycenter.yale.edu/autism/pddnos.html
- http://www.medicinenet.com/pervasive_development_disorders/page3.htm#treated
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