ADHD, also called attention-deficit disorder, is a behavior disorder, usually first diagnosed in childhood, that is characterized by inattention, impulsivity, and, in some cases, hyperactivity. These symptoms usually occur together; however, one may occur without the other(s).
The symptoms of hyperactivity, when present, are almost always apparent by the age of 7 and may be apparent in very young preschoolers. Inattention or attention-deficit may not be evident until a child faces the expectations of elementary school.
Types of ADHD
Three major types of ADHD include the following:
- ADHD, combined type
This, the most common type of ADHD, is characterized by impulsive and hyperactive behaviors as well as inattention and distractibility.
- ADHD, impulsive/hyperactive type
This, the least common type of ADHD, is characterized by impulsive and hyperactive behaviors without inattention and distractibility.
- ADHD, inattentive and distractible type
This type of ADHD is characterized predominately by inattention and distractibility without hyperactivity.
Causes of ADHD
ADHD is one of the most researched areas in child and adolescent mental health. However, the precise cause of the disorder is still unknown. Available evidence suggests that ADHD is genetic. It is a brain-based biological disorder. Low levels of dopamine (a brain chemical), which is a neurotransmitter (a type of brain chemical), are found in children with ADHD. Brain imaging studies using PET scanners (positron emission tomography; a form of brain imaging that makes it possible to observe the human brain at work) show that brain metabolism in children with ADHD is lower in the areas of the brain that control attention, social judgment, and movement.
Who is affected by attention-deficit/hyperactivity disorder?
Estimates suggest that about 2 million children (3 percent to 5 percent) have ADHD. Boys are two to three times more likely to have ADHD than girls.
Many parents of children with ADHD experienced symptoms of ADHD when they were younger. ADHD is commonly found in brothers and sisters within the same family. Most families seek help when their child's symptoms begin to interfere with learning and adjustment to the expectations of school and age-appropriate activities.
Symptoms of ADHD
Most symptoms seen in children with ADHD also occur at times in children without this disorder. However, in children with ADHD, these symptoms occur more frequently and interfere with learning, school adjustment, and, sometimes, with the child's relationships with others.
The following are the most common symptoms of ADHD. However, each child may experience symptoms differently. The three categories of symptoms of ADHD include the following:
- short attention span for age (difficulty sustaining attention)
- difficulty listening to others
- difficulty attending to details
- easily distracted
- poor organizational skills for age
- poor study skills for age
- often interrupts others
- has difficulty waiting for his/her turn in school and/or social games
- tends to blurt out answers instead of waiting to be called upon
- takes frequent risks, and often without thinking before acting
- seems to be in constant motion; runs or climbs, at times with no apparent goal except motion
- has difficulty remaining in his/her seat even when it is expected
- fidgets with hands or squirms when in his/her seat; fidgeting excessively
- talks excessively
- has difficulty engaging in quiet activities
- loses or forgets things repeatedly and often
- inability to stay on task; shifts from one task to another without bringing any to completion
The symptoms of ADHD may resemble other medical conditions or behavior problems. Always consult your child's physician for a diagnosis.
Diagnosis of ADHD
ADHD is the most commonly diagnosed behavior disorder of childhood. A pediatrician, child psychiatrist, or a qualified mental health professional usually identifies ADHD in children. A detailed history of the child's behavior from parents and teachers, observations of the child's behavior, and psychoeducational testing contribute to making the diagnosis of ADHD. Further, because ADHD is a group of symptoms, often diagnosis depends on evaluating results from several different types of evaluations, including physical, neurological, and psychological. Certain tests may be used to rule out other conditions, and some may be used to test intelligence and certain skill sets. Consult your child's physician for more information.
Treatment for ADHD
Specific treatment for attention-deficit/hyperactivity disorder will be determined by your child's physician based on:
- your child's age, overall health, and medical history
- extent of your child's symptoms
- your child's tolerance for specific medications, procedures, or therapies
- expectations for the course of the condition
- your opinion or preference
Major components of treatment for children with ADHD include parental support and education in behavioral training, appropriate school placement, and medication (psychostimulants). Treatment with a psychostimulant is highly effective in most children with ADHD.
Treatment may include:
- psychostimulant medications (stimulants)
Psychostimulant medications, used for their ability to balance chemicals in the brain that prohibit the child from maintaining attention and controlling impulses, may be used to reduce the major characteristics of ADHD, which include the following:
There are four different psychostimulant medications that are commonly used to treat ADHD, including the following :
- methylphenidate (Ritalin)
- dextroamphetamine (Dexedrine
- a mixture of amphetamine salts (Adderall)
- atomoxetine (Strattera) - a newer non-stimulant medication for ADHD
Psychostimulants have been used to treat childhood behavior disorders since the 1930s. They have been widely studied. Stimulants take effect in the body quickly, work for one to four hours, and then leave the body quickly. Recently many long acting stimulant medications have come on the market, lasting 8-9 hours, requiring one daily dosing. Doses of stimulant medications need to be timed to match the child's school schedule - to help the child pay attention for a longer period of time and improve classroom performance. The common side effects of stimulants may include, but are not limited to, the following:
Most side effects of stimulant use are mild, decrease with regular use, and respond to dose changes. Always discuss potential side effects with your child's physician.
- decreased appetite
- stomach aches
- rebound activation (when the effect of the stimulant wears off hyperactive and impulsive behaviors may increase for a short period of time)
Antidepressant medications may also be administered for children and adolescents with ADHD to help improve attention while decreasing aggression, anxiety, and/or depression.
- psychosocial treatments
Parenting children with ADHD may be difficult and can present challenges that create stress within the family. Classes in behavior management skills for parents can help reduce stress for all family members. Training in behavior management skills for parents usually occurs in a group setting which encourages parent-to-parent support. Behavior management skills may include the following:
- use of "time out"
- point systems
- contingent attention (responding to child with positive attention when desired behaviors occur; withholding attention when undesired behaviors occurs)
Teachers may also be taught behavior management skills to use in the classroom setting. Training for teachers usually includes use of daily behavior reports that communicate in-school behaviors to parents.
Behavior management techniques tend to improve targeted behaviors (such as completing school work or keeping the child's hands to himself/herself), but are not usually helpful in reducing inattention, hyperactivity, or impulsivity.
Prevention of ADHD
Preventive measures to reduce the incidence of ADHD in children are not known at this time. However, early detection and intervention can reduce the severity of symptoms, decrease the interference of behavioral symptoms on school functioning, enhance the child's normal growth and developmental process, and improve the quality of life experienced by children or adolescents with ADHD.