Pervasive Developmental Disorders
Pervasive developmental disorders
Pervasive developmental disorders are a group of neurological disorders that include autistic disorder (autism ), Asperger's syndrome, childhood disintegrative disorder, Rett's syndrome, and pervasive developmental disorder not otherwise specified (PDDNOS). These disorders are characterized by delayed development in functional, socialization, and communication skills .
The term pervasive developmental disorders was first used in the 1980s to describe a class of neurological disorders that involved impaired social and communication skills and repetitive behaviors.
Due to difficulties in accurately describing these disorders using the term pervasive developmental disorders, some neurological and psychiatric specialists have proposed new terminology to describe this class of disorders, including autistic spectrum disorders and multi-system neurological disorders.
Asperger's syndrome is characterized by difficulties with social relationships and skills and with poor coordination and restricted range of interests. Children with Asperger's syndrome generally have a normal to above average intelligence level and adequate knowledge of vocabulary and grammar but poor concentration and ability to understand language subtleties, such as humor. Asperger's syndrome is often incorrectly referred to as "high-functioning autism."
Autistic disorder, also referred to as autism, is characterized by moderate to severe communication, socialization, and behavioral problems, and in some children, mental retardation .
Childhood disintegrative disorder
Childhood disintegrative disorder is extremely rare, relative to the other pervasive developmental disorders. Children with this disorder develop normally until at least two years of age, after which an obvious regression in multiple functional skills occurs, including bladder and bowel control, ability to move, and language skills.
Pervasive developmental disorder not otherwise specified (PDDNOS)
Children are diagnosed with PDDNOS if their symptoms do not fit any of the other four types and/or they do not have the degree of impairment of the other four types. PDDNOS involves developmental impairments, such as communication and social skills, and repetitive behaviors that cannot be attributed to a specific developmental disorder or personality disorder. Usually, children with PDDNOS do not exhibit symptoms until age three or four.
Rett's syndrome occurs primarily in female children and is characterized by normal development for the first six to 18 months, followed by a noticeable change in behavior and loss of some abilities, especially motor skills. As the child ages, significant loss of speech, hand movement, and reasoning develops. Children with Rett's syndrome usually repeat certain movements and gestures, in particular, hand wringing or hand washing. Rett's syndrome is the rarest of the pervasive developmental disorders.
About one in 1,000 children born in the United States is diagnosed with autistic disorder, and it is four to five times more common in boys. Rett's syndrome has been diagnosed primarily in girls. Although autism is the most well-known of these disorders, PDDNOS is at least twice as common in children.
Causes and symptoms
As of 2004, the causes of these disorders were unknown. While genetics is believed to play a primary role, some children in families with a history of pervasive developmental disorders do not have a disorder. Medical researchers believe that genetic susceptibility plus additional factors contribute to the development of one of these disorders. Factors under investigation as a cause of these disorders include immune system problems, allergies , drugs, environmental pollution, and infections. Autopsy studies of individuals with pervasive developmental disorders have shown that brain cell structure is different, particularly in the brain stem area. In addition, because many individuals with pervasive developmental disorders are also affected by seizures, "electrical miswiring" of the brain may also contribute to these disorders. Researchers have used magnetic resonance imaging (MRI) and positron emission tomography (PET) to find subtle differences in the brain structure and function of children with these disorders.
Symptoms of pervasive developmental disorders may be visible as early as infancy; however, the typical age of onset is age three. Although each of the five types has some distinctive symptoms, in general, early symptoms of a pervasive developmental disorder include the following:.
- impaired language skills
- difficulties relating to people, objects, or activities
- unusual play
- repetitive body movements or behavior patterns
- difficulties handling changes in routine or surroundings
- unusual responses to sensory stimuli, like loud noises and lights
When to call the doctor
Parents should see a physician as soon as they notice developmental problems or delays in their infant or child.
Pervasive developmental disorders are diagnosed using the Diagnostic and Statistical Manual of Mental Disorders (DSM), which provides criteria for physicians to diagnose the specific type. Diagnosis of a pervasive developmental disorder is difficult because there is no specific medical test, like a blood test or imaging test that can confirm the diagnosis. Some physicians may hesitate to diagnose very young children with a specific type of pervasive developmental disorder.
Diagnosis of these disorders usually requires consultation and assessment by a specialist in childhood developmental disorders, such as a child psychiatrist, pediatric neurologist, neuropsychologist, or developmental child psychologist. These specialists evaluate laboratory medical tests, neurological tests, and psychological tests ; interview parents and children; and observe and assess behaviors. Educational skill testing, communication assessment, and motor skill assessment may also be conducted. Medical tests that may be performed to rule out other medical conditions include electroencephalography, MRI, and blood tests.
Once a pervasive developmental disorder is diagnosed, the diagnosis must be narrowed to one of the five types, which is achieved by using pre-established DSM criteria that outline the key differences among the types. For example, for childhood disintegrative disorder to be diagnosed, symptoms must be preceded by at least two years of normal development and onset of decline and regression must occur prior to age 10 years.
As of 2004, no cure existed for these disorders, and no specific therapy works for all individuals. Treatment depends on the severity of the disorder and consists of specialized therapy, special education , and medication to address specific behavioral problems. Medications that may be prescribed to treat specific symptoms include anti-depressants, anti-anxiety medications, anti-spasmodic and anti-seizure medications, and stimulants. Therapeutic interventions include applied behavior analysis (the Lovaas method), auditory integration training, behavior modification programs, play therapy, occupational and physical therapy, animal-assisted therapy, art/music/dance therapy, sensory integration, and speech therapy.
Alternative treatments for pervasive developmental disorders focus on nutrition . Some evidence has shown that vitamin therapy with vitamin B6 and magnesium supplementation can help children with autism and PDDNOS. Because some children with pervasive developmental disorders have food sensitivities or food allergies , allergy testing and subsequent dietary modification may help. In food-allergic children, certain foods have been shown to increase hyperactivity and autistic behavior. Anti-yeast therapy has also been proposed because children with autism and PDDNOS sometimes have higher yeast levels in their bodies. Administering anti-yeast medications has decreased negative behaviors in some children. Before parents turn to alternative therapy, they should consult a physician to make sure it does not interfere or interact with any other medications.
Pervasive developmental disorders are not life-threatening and do not affect normal life expectancy. Prognosis depends on the severity and type of disorder and the effectiveness of early interventions. Early intervention with specialized educational and behavioral support programs improves the quality of life and level of functioning of children with these disorders. However, because of their impaired communication and social skills, about 70 percent of individuals with a pervasive developmental disorder are never able to live on their own.
Pervasive developmental disorders are caused by a complex interaction of genetics, neurological factors, and environmental factors. As of 2004, there was no genetic test to detect these disorders, and there is no way to prevent their development.
The majority of children with a pervasive developmental disorder will require special education services. By law, public schools must evaluate children at no cost and provide special education services to eligible children with disabilities. Some private or alternative schools may be dedicated to serving children with such disorders and offer more comprehensive education and therapeutic options, but at an additional cost to parents.
Parenting children with pervasive developmental disorders is difficult and emotionally demanding. Parents and families can benefit from joining a support group. Benefits of parent support groups include information sharing, emotional support, and educational assistance.
Electroencephalography —The recording of electrical impulses produced by the brain's activity via electrodes attached to a patient's scalp.
Magnetic resonance imaging (MRI) —An imaging technique that uses a large circular magnet and radio waves to generate signals from atoms in the body. These signals are used to construct detailed images of internal body structures and organs, including the brain.
Positron emission tomography (PET) —A computerized diagnostic technique that uses radioactive substances to examine structures of the body. When used to assess the brain, it produces a three-dimensional image that shows anatomy and function, including such information as blood flow, oxygen consumption, glucose metabolism, and concentrations of various molecules in brain tissue.
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"Pervasive Developmental Disorders." Gale Encyclopedia of Children's Health: Infancy through Adolescence. . Encyclopedia.com. (April 24, 2017). http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/pervasive-developmental-disorders-1
"Pervasive Developmental Disorders." Gale Encyclopedia of Children's Health: Infancy through Adolescence. . Retrieved April 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/pervasive-developmental-disorders-1
Pervasive Developmental Disorders
Pervasive Developmental Disorders
Pervasive developmental disorders include five different conditions: Asperger's syndrome, autistic disorder, childhood disintegrative disorder (CDD), pervasive developmental disorder not otherwise specified (PDDNOS), and Rett's syndrome. They are grouped together because of the similarities between them. The three most common shared problems involve communication skills, motor skills, and social skills. Since there are no clear diagnostic boundaries separating these conditions it is sometimes difficult to distinguish one from the other for diagnostic purposes.
Asperger's syndrome, autistic disorder, and childhood disintegrative disorder are four to five times more common in boys, and Rett's syndrome has been diagnosed primarily in girls. All of these disorders are rare.
Children afflicted with Asperger's syndrome exhibit difficulties in social relationships and communication. They are reluctant to make eye contact, do not respond to social or emotional contacts, do not initiate play activities with peers, and do not give or receive attention or affection. To receive this diagnosis the individual must demonstrate normal development of language, thinking and coping skills. Due to an impaired coordination of muscle movements, they appear to be clumsy. They usually become deeply involved in very few interests, which tend to occupy most of their time and attention.
Autistic disorder is frequently evident within the first year of life, and must be diagnosed before age three. It is associated with moderate mental retardation in three out of four cases. These children do not want to be held, rocked, cuddled or played with. They are unresponsive to affection, show no interest in peers or adults and have few interests. Other traits include avoidance of eye contact, an expressionless face and the use of gestures to express needs. Their actions are repetitive, routine and restricted. Rocking, hand and arm flapping, unusual hand and finger movements, and attachment to objects rather than pets and people are common. Speech, play, and other behaviors are repetitive and without imagination. They tend to be overactive, aggressive, and self-injurious. They are often highly sensitive to touch, noise, and smells and do not like changes in routine. Autism and several disorders classified with it have increased significantly in recent years so that they now are diagnosed more often in children than spina bifida, cancer, or Down syndrome. This may be due partly to improved recognition and diagnosis.
Childhood disintegrative disorder
Childhood disintegrative disorder is also called Heller's disease and most often develops between two and ten years of age. Children with CDD develop normally until two to three years of age and then begin to disintegrate rapidly. Signs and symptoms include deterioration of the ability to use and understand language to the point where they are unable to carry on a conversation. This is accompanied by loss of control of the bladder and bowels. Any interest or ability to play and engage in social activities is lost. The behaviors are nearly identical with those that are characteristic of autistic disorder. However, childhood disintegrative disorder becomes evident later in life and results in developmental regression, or loss of previously attained skills, whereas autistic disorder can be detected as early as the first month of life and results in a failure to progress.
Pervasive developmental disorder not otherwise specified
The term pervasive developmental disorder not otherwise specified (PDDNOS) is also referred to as atypical personality development, atypical PDD, or atypical autism. Individuals with this disorder share some of the same signs and symptoms of autism or other conditions under the category of pervasive developmental disorders, but do not meet all of the criteria for diagnosis for any of the four syndromes included in this group of diseases. Because the children diagnosed with PDDNOS do not all exhibit the same combination of characteristics, it is difficult to do research on this disorder, but the limited evidence available suggests that patients are seen by medical professionals later in life than is the case for autistic children, and they are less likely to have intellectual deficits.
Rett's syndrome was first described in 1966 and is found almost exclusively in girls. It is a disease in which cells in the brain experience difficulty in communicating with each other. At the same time the growth of the head falls behind the growth of the body so that these children are usually mentally retarded. These conditions are accompanied by deficits in movement (motor) skills and a loss of interest in social activities.
The course of the illness has been divided into four stages. In stage one the child develops normally for six to 18 months. In stage two, development slows down and stops. Stage three is characterized by a loss of the speech and motor skills already acquired. Typically this happens between nine months and three years of age. Stage four begins with a return to learning that will continue across the lifespan, but at a very slow rate. Problems with coordination and walking are likely to continue and even worsen. Other conditions that can occur with Rett's syndrome are convulsions, constipation, breathing problems, impaired circulation in the feet and legs, and difficulty chewing or swallowing.
Causes and symptoms
The causes of these disorders are unknown although brain structure abnormalities, genetic mutation, and alterations in brain function are believed to play a role. Still, no single brain abnormality or location has been connected to a cause. In 2004, scientists reported finding the gene mutation (on gene MECP2) that is present in 80% of people affected with Rett's syndrome. In 2004, comprehensive review of research on twins revealed that interactions between multiple genes may play a role in the cause of autism. A number of neurological conditions, such as convulsions, are commonly found to accompany these disorders.
The diagnosis of pervasive developmental disorder is made by medical specialists based on a thorough examination of the patient, including observing behavior and gathering information from parents and caregivers. Because many symptoms are common to more than one condition, distinctions between conditions must be carefully made. The following summary describes the distinction between three common disorders.
- impairment of two-way social interaction
- Repetitive and predictable behavior patterns and activities
- all listed for PDDNOS
- severe impairment in communication
- abnormal social interaction and use of language for social communication or imaginative play before age of three
- not better accounted for by another psychiatric order
- all listed for PDDNOS
- clinically significant impairment in social, occupational, or other areas of functioning
- no general delay in language
- no delay in cognitive development, self-help skills, or adaptive behavior
- not better accounted for by another pervasive developmental disorder or schizophrenia
- a period of normal development between 6-18 months
- normal head circumference at birth, followed by a slowing of head growth
- repetitive hand movements
- normal development for at least two years
- loss of skills in at least two of the following areas: language, social skills, bowel or bladder control, play, movement skills
- abnormal functioning in at least two of the following areas: social interaction, communication, behavior patterns
- not better accounted for by another PDD or mental illness
Treatment for children with pervasive developmental disorders is limited. Those who can be enrolled in educational programs will need a highly structured learning environment, a teacher-student ratio of not more than 1:2, and a high level of parental involvement that provides consistent care at home. Psychotherapy and social skills training can prove helpful to some. There is no specific medication available for treating the core symptoms of any of these disorders, though research is promising. Some psychiatric medications may be helpful in controlling particular behavior difficulties, such as agitation, mood instability, and self-injury. Music, massage, and hydrotherapy may exert a calming effect on behavior. Treatment may also include physical and occupational therapy.
In general, the prognosis in all of these conditions is tied to the severity of the illness.
The prognosis for Asperger's syndrome is more hopeful than that for other diseases in this cluster. These children are likely to grow up to be functional independent adults, but will always have problems with social relationships. They are also at greater risk for developing serious mental illness than the general population.
The prognosis for autistic disorder is not as good, although great strides have been made in recent years in its treatment. The higher the patient's IQ (intelligence quotient) and ability to communicate, the better the prognosis. However, many patients will always need some level of custodial care. In the past, most of these individuals were confined to institutions, but many are now able to live in group homes or supervised apartments. The prognosis for childhood disintegrative disorder is even less favorable. These children will require intensive and long-term care. Children diagnosed with PDDNOS have a better prognosis because their initial symptoms are usually milder, IQ scores are higher, and language development is stronger.
The causes of pervasive developmental disorders are not understood, although research efforts are getting closer to understanding the problem. Until the causes are discovered, it will remain impossible to prevent these conditions.
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International Rett Syndrome Association. 9121 Piscataway Road, Suite 2B, Clinton, MD 20735. (800) 818-7388. 〈http://www.rettsyndrome.org〉.
Learning Disabilities Association of America. 4156 Library Road, Pittsburg, PA 15234. (412) 341-1515. 〈http://www.ldanatl.org〉.
National Organization for Rare Disorders. P.O. Box 8923, New Fairfield, CT 06812-8923. (800) 999-6673. 〈http://www.rarediseases.org〉.
Boyle, Thomas D. "Diagnosing Autism and Other Pervasive Personality Disorders." INJersye.com Page. 〈http://www.injersey.com〉.
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The International Rett Syndrome Association. 9121 Piscataway Road, Suite 2B, Clinton, MD 20735. (800) 818-7388 〈http://www.rettsyndrome.org〉.
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Hydrotherapy— This term literally means "water treatment" and involves the use of water in physical therapy as well as treatment of physical and emotional illness.
Mutation— A mutation is a change in a gene. Since genes determine how a body is structured and functions, any change in a gene will produce some change in these areas.
Neurological conditions— A condition that has its origin in some part of the patient's nervous system.
"Pervasive Developmental Disorders." Gale Encyclopedia of Medicine, 3rd ed.. . Encyclopedia.com. (April 24, 2017). http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/pervasive-developmental-disorders
"Pervasive Developmental Disorders." Gale Encyclopedia of Medicine, 3rd ed.. . Retrieved April 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/pervasive-developmental-disorders
Pervasive developmental disorders
Pervasive developmental disorders
Pervasive developmental disorders are a group of conditions originating in childhood that involve serious impairment in several areas, including physical, behavioral, cognitive, social, and language development.
Pervasive developmental disorders (PDDs) are thought to be genetically based, with no evidence linking them to environmental factors; their incidence in the general population is estimated at 1%. The most serious PDD is autism , a condition characterized by severely impaired social interaction, communication, and abstract thought, and often manifested by stereotyped and repetitive behavior patterns. Many children who are diagnosed with PDDs today would have been labeled psychotic or schizophrenic in the past.
The handbook used by mental health professionals to diagnose mental disorders such as PDDs is the Diagnostic and Statistical Manual of Mental Disorders . The 2000 edition of this manual (fourth edition, text revised) is known as the DSM-IV-TR. Published by the American Psychiatric Association, the DSM contains diagnostic criteria, research findings, and treatment information for mental disorders. It is the primary reference for mental health professionals in the United States.
Besides autism, the DSM lists several other conditions as PDDs:
Characterized by physical, mental, and social impairment, this syndrome appears between the ages of five months and four years in children whose development has been normal up to that point. Occurring only in girls, it involves impairment of coordination, repetitive movements, a slowing of head growth, and severe or profound mental retardation , as well as impaired social and communication skills.
Childhood disintegrative disorder
This disorder is marked by the deterioration of previously acquired physical, social, and communication skills after at least two years of normal development. More common in males than females, it first appears between the ages of two and 10 (usually at three or four years of age), and many of its symptoms resemble those of autism. Other names for this disorder are Heller's syndrome, dementia infantilis, and disintegrative psychosis . It sometimes appears in conjunction with a medical condition such as Schilder's disease, but usually no organic cause can be found.
Children with this disorder have many of the same social and behavioral impairments as autism, except for difficulties with language. They lack normal tools of social interaction, such as the ability to meet someone else's gaze, use appropriate body language and gestures, or react to another person's thoughts and feelings. Behavioral impairments include the repetitive, stereo-typed motions and rigid adherence to routines that are characteristic of autism. Like childhood disintegrative disorder , Asperger's disorder is more common in males than females.
In general, the prognosis in each of these conditions is tied to the severity of the illness.
The prognosis for Asperger's syndrome is more hopeful than the others in this cluster. These children are likely to become functional, independent adults, but will always have problems with social relationships. They are also at greater risk for developing serious mental illness than the general population.
The prognosis for autistic disorder is not as good, although great strides have been made in recent years in its treatment. The higher the patient's intelligence quotient (IQ) and ability to communicate, the better the prognosis. However, many patients will always need some level of custodial care. In the past, most of these individuals were confined to institutions, but many are now able to live in group homes or supervised apartments. The prognosis for childhood disintegrative disorder is the least favorable. These children will require intensive and long-term care.
American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. Fourth edition, text revised. Washington DC: American Psychiatric Association, 2000.
Volkmar, Fred R., ed. Autism and Pervasive Developmental Disorders. New York: Cambridge University Press, 1998.
Waltz, Mitzi, and Linda Lamb. Pervasive Developmental Disorders: Finding a Diagnosis & Getting Help. Cambridge: O'Reilly & Associates, Incorporated, 1999.
Autism National Committee (AUTCOM). P.O. Box 6175, North Plymouth, MA 02362-6175. Web site: <http://www.autcom.org/>.
New Jersey Center for Outreach and Services for the Autism Community (COSAC). 1450 Parkside Avenue Suite 22, Ewing, NJ 08638. Telephone: (609) 883-8100 or (800) 4-AUTISM (428-8476). Web site: <http://www.njcosac.org>.
"Pervasive developmental disorders." Gale Encyclopedia of Mental Disorders. . Encyclopedia.com. (April 24, 2017). http://www.encyclopedia.com/psychology/encyclopedias-almanacs-transcripts-and-maps/pervasive-developmental-disorders
"Pervasive developmental disorders." Gale Encyclopedia of Mental Disorders. . Retrieved April 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/psychology/encyclopedias-almanacs-transcripts-and-maps/pervasive-developmental-disorders
Pervasive Developmental Disorder (PDD)
Pervasive developmental disorder (PDD)
A group of conditions involving serious impairment in several areas of development, including physical, behavioral, cognitive, social, and language development.
The incidence of pervasive development disorders (PDDs) in the general population is estimated at 1%. These disorders are thought to be genetically based, and there is no evidence linking them to environmental factors. Many children who are diagnosed with PDDs today would have been labeled psychotic or schizophrenic in the past. The most serious form of pervasive developmental disorder is autism , a congenital condition characterized by severely impaired social interaction, communication, and abstract thought, and often manifested by stereotyped and repetitive behavior patterns.
In addition to autism, several other conditions are considered pervasive developmental disorders by the American Psychiatric Association . Rett's disorder is characterized by physical, mental, and social impairment that appears between the ages of five months and four years in children whose development has been normal up to that point. Occurring only in girls, it involves impairment of coordination, repetitive movements, a slowing of head growth, and severe or profound mental retardation , as well as impaired social and communication skills. Childhood disintegrative disorder is marked by the deterioration
of previously acquired physical, social, and communication skills after at least two years of normal development. It first appears between the ages of two and 10, usually at three or four years of age, and many of its symptoms resemble those of autism. Other names for this disorder are Heller's syndrome, dementia infantilis, and disintegrative psychosis . It sometimes appears in conjunction with a medical condition such as Schilder's disease, but usually no organic cause can be found.
Asperger's disorder includes many of the same social and behavioral impairments as autism, except for difficulties with language. Children with this disorder lack normal tools of social interaction, such as the ability to meet someone else's gaze, use appropriate body language and gestures, or react to another person's thoughts and feelings. Behavioral impairments include the repetitive, stereotyped motions and rigid adherence to routines that are characteristic of autism. Like childhood disintegrative disorder, Asperger's disorder is thought to be more common in males than females.
Research based on autopsies and magnetic resonance imaging (MRI) of live patients shows that PDDs are connected with specific abnormalities in the brain . These conditions are usually evident in early childhood and often cause some degree of mental retardation. They are not curable, but there are a variety of treatments that can alleviate specific symptoms and help children function better in daily life. Drugs like Prozac, Zoloft, and Luvox, all selective serotonin reuptake inhibitors (SSRIs), can reduce aggression and repetitive thoughts and improve social interaction. Attention problems and hyperactivity respond to psychostimulants, such as Ritalin, Dexedrine, and Cylert, which can make children more responsive to other types of intervention. Behavior therapy has helped children with PDDs minimize negative behavior, such as repetitive activities and persistent preoccupations, and group therapy has helped improve social skills.
Education is an important component in the treatment of PDDs. Special education programs that address all types of developmental problems—social, linguistic, and behavioral—are mandated by federal law and available to children from the ages of four or five. Even those children with PDDs who can be enrolled in regular classes can benefit from supplemental special instruction programs. Speech, language, and occupational therapy can help children with PDDs, including autism, function at the highest level possible. In many cases, appropriate education and therapy from the earliest age can save these children from institutionalization .
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"Pervasive Developmental Disorder (PDD)." Gale Encyclopedia of Psychology. . Encyclopedia.com. (April 24, 2017). http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/pervasive-developmental-disorder-pdd
"Pervasive Developmental Disorder (PDD)." Gale Encyclopedia of Psychology. . Retrieved April 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/pervasive-developmental-disorder-pdd
Pervasive Developmental Disorders
Pervasive Developmental Disorders
Pervasive (per-VAY-siv) developmental disorders are a group of conditions in which the brain fails to develop normally, resulting in serious problems with communication, social interaction, and behavioral development.
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Childhood disintegrative disorder
Pervasive developmental disorders are conditions that prevent children from developing normal communication and normal social abilities. Signs of these conditions begin to appear in the very early years of childhood. Some forms of pervasive developmental disorder (PDD) are milder and other forms are more severe. Most children with these conditions have very limited interests and activities, and some engage in unusual behavior, such as rocking, flapping their hands, or even behavior that causes self-injury.
PDDs include autism (AW-tizm), Asperger (AS-per-ger) disorder, Rett disorder, and childhood disintegrative disorder. The term “pervasive developmental disorder” refers to the whole group of conditions, but it sometimes is used to refer to milder forms of autism. The word “pervasive” means affecting all aspects of something. It is used for these conditions because they can affect all aspects of a person’s life.
Autism is a brain disorder that affects children within the first 3 years of life. Sometimes these children may appear to develop normally for a time in early infancy. The word “autism” comes from the Greek word meaning “self.” It was chosen for the disorder because of the characteristic self-absorption of people who have it. Indeed, children with autism appear to live in a world of their own, often seeming not even to notice members of their own family around them. They seldom make eye contact with other people or share their interests.
Children with autism are socially isolated. Their social problems are made worse by the fact that their language skills usually do not develop normally. Some children may never learn to talk. Others may talk, but they use language inappropriately, perhaps simply repeating the words of others or reversing the meanings of “I” and “you.” They may repeat certain behavior, such as hand-flapping or body-rocking, over and over for no apparent purpose.
Asperger disorder is generally thought to be a milder form of pervasive developmental disorder, and it shares with autism the features of social isolation and lack of responsiveness to other people. The difference between Asperger disorder and what is called “classic” autism is that a child with Asperger disorder has the intellectual function and language skills of a normal child of the same age. In fact, children with this disorder often have excellent vocabularies, but do not use their language skills for appropriate conversation. Socially, they often lack good give-and-take interactions. They may memorize and then recite timetables or lists (for example, facts from almanacs) or have intense and very focused interests (for example, mechanical devices). A child with Asperger disorder may know the names and numbers of every Amtrak engine or be an expert on their town’s fire stations. Also, their social interactions often revolve around their overly focused interests (“Which fire station is near your house?” may be a way to say “Hello”).
Rett disorder is a severe genetic* developmental condition that affects only girls. At first, the child develops normally, usually for about 1 to 2 years after birth. She may even begin to walk and talk. Then she starts to lose these skills and may show signs of a stiff-legged walk. Losing the ability to use words to communicate, she also may lose interest in making friends. A typical physical sign of Rett disorder is that the child’s head stops growing at the normal rate.
- * genetic
- (je-NE-tik) pertains to the genes, which are contained in the chromosomes found in the cells of the body. Genes help determine a person’s characteristics, such as hair or eye color, and they also are involved in the cause of some medical conditions. They are inherited from a person’s parents.
Childhood disintegrative disorder has signs that are in many ways similar to those of autism. An important difference is that in childhood disintegrative disorder a child may develop normally for 2 to 10 years. Then the child may begin to lose some combination of social or communicative skills, bowel or bladder control, or motor skills (physical coordination).
Rett disorder is now understood to be caused primarily by a faulty gene. The causes of most cases of autism, Asperger disorder, and childhood disintegrative disorder are not yet known. Because autism and Asperger disorder tend to run in families, it is believed that they are at least partly caused by faulty genes. Some authorities believe that childhood disintegrative disorder may be the result of damage to the developing brain, but it is not known how this damage occurs.
In order to diagnose a developmental disorder, a doctor or psychologist first asks the child’s parents questions about the child’s early development and then carefully observes the child to identify possible signs of impairment in social activities, behavior, and communication.
There are no cures for pervasive developmental disorders, but many children do improve over time. Early intervention is key to developing social and language skills. Therefore, prompt and proper diagnosis is important, so that well-planned special training and education can begin. Children are taught how to overcome the effects of certain impairments and to build on the skills they have. Medication may be used to treat special problems, such as seizures* or hyperactivity*. One key to treatment is the development of a communication system that can help children with their social skills. One communication system that has proven to be effective uses “picture exchanges.” For example, if a child wants a drink, he hands the teacher a picture (symbol) of a drink. Pictures are gradually added together (picture of orange + picture of drink) and paired with words. Often, words then begin to replace the picture exchange system.
- * seizures
- (SEE-zhurs) are sudden attacks of involuntary (uncontrollable) body movements, changes in behavior, or loss of consciousness that result from bursts of abnormal electrical energy within the brain.
- * hyperactivity
- (hy-per-ak-TI-vitee) is overly active behavior, which makes it hard for a person to sit still.
Often, children with these disorders can learn to attend to their basic needs such as self-feeding, dressing, and personal care. Many individuals with milder developmental problems learn to use language effectively and learn to relate well enough to gain some degree of independence (have a job; live in a group home) as adults. Some people with autism and Asperger disorder make rapid developmental progress in school and eventually may live by themselves.
Many individuals with PDDs, however, never lean to relate socially, develop a communication system to express their needs, or rid themselves of unusual behaviors such as rocking or hand-flapping.
Attwood, Tony. Asperger’s Syndrome: A Guide for Parents and Professionals. Philadelphia: Jessica Kingsley Publishers, 1997.
Lewis, Jackie, and Debbie Wilson. Pathways to Learning in Rett Syndrome. London: David Fulton, 1998. Written for parents.
Seroussi, Karyn. Unraveling the Mystery of Autism and Pervasive Developmental Disorder: A Mother’s Story of Research and Recovery. New York: Simon and Schuster, 2000. Written for parents.
Kidshealth.org, A. I. duPont Hospital for Children, 1600 Rockland Road, Wilmington, DE 19803. This organization is dedicated to issues of children’s health. Their website has much valuable information for children, teens, and parents. For specific information on autism, go to http://KidsHealth.org.
"Pervasive Developmental Disorders." Complete Human Diseases and Conditions. . Encyclopedia.com. (April 24, 2017). http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/pervasive-developmental-disorders-0
"Pervasive Developmental Disorders." Complete Human Diseases and Conditions. . Retrieved April 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/pervasive-developmental-disorders-0