Mental retardation
    
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Mental retardation

Definition

Mental retardation is described as a condition that is diagnosed before age 18, and includes below-average general intellectual function, accompanied by impairment in the person's ability to acquire the skills necessary for daily living.

Causes

Causes of mental retardation are numerous, but a specific reason for mental retardation is determined in only 25% of the cases.

Failure to adapt (adjust to new situations) normally and grow intellectually may become apparent early in life. In the case of mild retardation, these failures may not become recognizable until school age or later. An assessment of age-appropriate adaptive behaviors can be made by the use of developmental screening tests. The failure to achieve developmental milestones is suggestive of mental retardation.

A family may suspect mental retardation if motor skills, language skills, and self-help skills do not seem to be developing in a child, or are developing at a far slower rate than the child's peers.

The degree of impairment from mental retardation has a wide range, from profoundly impaired to mild or borderline retardation. Less emphasis is now placed on degree of retardation and more on the amount of intervention and care required for daily life.

Mental retardation affects about 1 to 3% of the population.

Risk factors are related to the causes. Causes of mental retardation can be roughly broken down into several categories:

Symptoms

  • failure to meet intellectual developmental markers
  • persistence of infantile behavior
  • lack of curiosity
  • decreased learning ability
  • inability to meet educational demands of school

Note: Variations in normal adaptive behaviors depend on the severity of the condition. Mild retardation may be associated with a lack of curiosity and quiet behavior. Severe mental retardation is associated with infantile behavior throughout life.

Exams and Tests

  • development significantly less than that of peers
  • an intelligence quotient (IQ) score below 70 on a standardized IQ test
  • adaptive behavior score below average
  • abnormal Denver developmental screening test

Treatment

The primary goal of treatment is to develop the person's potential to the fullest. Special education and training may begin as early as infancy. This includes social skills to help the person function as normally as possible.

It is important for a specialist to evaluate the person for coexisting affective disorders and treat those disorders. Behavioral approaches are important in understanding and working with mentally retarded individuals.

Outlook (Prognosis)

The outcome is related to the aggressiveness of treatment, personal motivation, opportunity, and associated conditions. Many people lead productive lives while functioning independently; others require a structured environment to be most successful.

Possible Complications

Complications vary. They may include:

  • social isolation
  • inability to care for self
  • inability to interact with others appropriately

When to Contact a Medical Professional

Call your health care provider if you have any concerns about your child's development, if you notice a lack of normal development with motor or language skills in a child, or if there are associated disorders that need treatment.

Prevention

Genetic: Prenatal screening for genetic defects, and genetic counseling for families at risk for known heritable disorders can decrease the incidence of genetically caused mental retardation.

Social: Government programs to insure adequate nutrition are available to the underprivileged in the first and most critical years of life. These programs can reduce retardation associated with malnutrition. Social programs to reduce poverty and provide good education can impact the mild "retardation" associated with impoverished and lower socioeconomic status. Early intervention in situations involving abuse and deprivation will also help.

Toxic: Environmental programs to reduce exposure to lead, mercury, and other toxins will reduce toxin-associated retardation. However, the benefits may take years to become apparent. Increased public awareness of the risks of alcohol and drugs during pregnancy can help reduce the incidence of retardation.

Infectious: The prevention of congenital rubella syndrome is probably one of the best examples of a successful program to prevent one form of mental retardation. Constant vigilance, such as in the relationship of cats, toxoplasmosis, and pregnancy, helps to reduce retardation that results from this infection.

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