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Mental disorders diagnosed in childhood

Medical condition

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  • 13 chapters

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Through Mood disorder and Conduct disorder

Intellectual disability

DSM-5-TR

The diagnostic criteria necessary in order to diagnose intellectual disability consists of:

A. Deficits in intellectual functions, such as reasoning, problem solving, planning, abstract thinking, and learning from experience. These deficits are confirmed through clinical assessments and individualized standardized tests.
B. Deficits in adaptive functioning that cause failure to perform sociocultural and developmental standards for independence and social responsibility. Without support, these deficits can lead to limited functioning in areas of daily life, such as in communication and independent living.
C. These symptoms must have onset during the developmental period.

Intellectual disability is specified by severity, with the varying severities being mild, moderate, severe, and profound. These severity levels are determined by how well one is able to function intellectually, socially, and independently.

Cause

Intellectual disability in children can be caused by genetic or environmental factors. The individual could have a natural brain malformation or pre or postnatal damage done to the brain caused by drowning or a traumatic brain injury, for example. Nearly 30 to 50% of individuals with intellectual disability will never know the cause of their diagnosis even after thorough investigation.

Prenatal causes of intellectual disability include:

  • Congenital infections such as cytomegalovirus, toxoplasmosis, herpes, syphilis, rubella and human immunodeficiency virus
  • Prolonged maternal fever in the first trimester
  • Exposure to anticonvulsants or alcohol
  • Untreated maternal phenylketonuria (PKU)
  • Complications of prematurity, especially in extremely low-birth-weight infants
  • Postnatal exposure to lead

Single-gene disorders that result in intellectual disability include:

These single-gene disorders are usually associated with atypical physical characteristics. About 1/4 of individuals with intellectual disability have a detectable chromosomal abnormality. Others may have small amounts of deletion or duplication of chromosomes, which may go unnoticed and therefore, undetermined.

Symptoms

As an infant, the individual with intellectual disability might sit up, crawl, or walk later than what is developmentally appropriate. They may have trouble talking or learn to talk late. The infants with intellectual disability will probably have trouble learning to potty train, feeding themselves, remembering things, with problem-solving, and may have recurrent explosive tantrums.

Some symptoms that a child with intellectual disability might show are continued infant-like behavior, a lack of curiosity, the inability to meet educational demands, learning ability that is below average, and the failure to meet developmentally appropriate intellectual goals. Some children with severe intellectual disability may have seizures, mobility problems, vision problem, or hearing problems.

Treatment

There is no treatment for intellectual disability but there are plenty of services offered for those diagnosed to help them function in their everyday lives. Professionals will sometimes work out an Individualized Family Service Plan (IFSP), which documents the child's needs, as well as the services that would best help them specifically. Speech, physical, and occupational therapy may be offered. Intellectually disabled children can be placed in special education classes through the public school system, where the school and parents will map out an Individualized Education Program (IEP). This program lays out all of the services and classes the child will become involved in during their time in school.

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