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Attention deficit hyperactivity disorder (ADHD) refers to a chronic disorder that initially manifests in childhood and is characterized by problems with hyperactivity, impulsivity, and/or inattention. Not all patients manifest all three behavioral categories. These symptoms have been associated with difficulty in academic, emotional, and social functioning. The diagnosis is established by satisfying specific criteria, and the condition may be associated with other neurological, significant behavioral, and/or developmental/learning disabilities. Therapy may consider the use of medication, behavioral therapy, and adjustments in day-to-day lifestyle activities. ADHD is thus one of the most common disorders of childhood. ADHD occurs two to four times more commonly in boys than girls (male to female ratio 4:1 for the predominantly hyperactive type versus 2:1 for the predominantly inattentive type). While previously believed to be "outgrown" by adulthood, current opinion indicates that many children will continue throughout life with symptoms that may affect both occupational and social functioning.
The medical community recognizes three basic forms of the disorder, as follows:
The combined type of ADHD is the most common. The predominantly inattentive type is being recognized more and more, especially in girls and in both sexes of adults. The predominantly hyperactive-impulsive type, without significant attention problems, is rare.
We are still learning about ADHD, and experts' ideas of the disorder are still being shaped. Some believe, for example, that the term "attention deficit" is misleading.
Contrary to some media accounts, attention disorders are not new. Childhood hyperactivity was a focus of interest in the early 1900s. Today, hyperactivity, impulsivity, and inattention are the focus, but disability related to hyperactivity and distractibility has been alluded to throughout medical history. Historical figures of diverse backgrounds and accomplishment have demonstrated behavior compatible with ADHD. Mozart composed and remembered entire musical compositions but disliked the tedious task and attention to detail necessary when transcribing to paper. Einstein would spend hours and even days sitting quietly in a chair doing "thought experiments," including complex series of mathematical calculations and revisions. Ben Franklin failed in school due to his perfectionist and impulsive behaviors. He later mastered five languages (self-taught) and is highly respected as an author, scientist, inventor, and businessman (publisher). What is new is the greater awareness of ADHD thanks to rapidly mounting research findings.
In the United States, ADHD affects about 3%-10% of children. Similar rates are reported in other developed countries such as Germany, New Zealand, and Canada.
There is disagreement over whether ADHD persists as children grow into adults.
People with ADHD are much more likely than the general population to have other related conditions such as learning disorders, restless legs syndrome, ophthalmic convergence insufficiency, depression, anxiety disorder, antisocial personality disorder, substance abuse disorder, conduct disorder, and obsessive-compulsive behavior. People with ADHD are also more likely than the general population to have a family member with ADHD or one of the related conditions.
The pathogenesis (cause) of ADHD has not been totally defined. One theory springs from observations regarding variations in functional brain-imaging studies between those with and without symptoms. Similar variations have been shown in studies of the structure of the brain of affected and nonaffected individuals. Animal studies have demonstrated differences in the chemistry of brain transmitters involved with judgment, impulse control, alertness, planning, and mental flexibility. A genetic predisposition has been demonstrated in (identical) twin and sibling studies. If one identical twin is diagnosed with ADHD, there is a 92% probability of the same diagnosis in the twin sibling. When comparing nonidentical twin sibling subjects, the probability falls to 33%. Overall population incidence is 3%-10%.
Genes that control the relative levels of chemicals in the brain called neurotransmitters seem to be different in ADHD, and levels of these neurotransmitters are out of normal balance.
The six major tasks of executive function that are most commonly distorted with ADHD are the following:
The symptoms of attention deficit hyperactivity disorder (ADHD) are not physical symptoms such as ear pain or vomiting but rather exaggerated or unusual behaviors. The type and severity of symptoms vary greatly among people with ADHD. The severity of symptoms depends on the degree of abnormality in the brain, the presence of related conditions, and the individual's environment and response to that environment.
The diagnostic criteria for ADHD are outlined in the Diagnostic and Statistical Manual of Mental Health, 4th ed. (DSM-IV), copyright 1994, American Psychiatric Association. All of the symptoms of inattention, hyperactivity, and impulsivity must have persisted for at least six months to a degree that is maladaptive and inconsistent with the developmental level of the child.
Inattention:
Hyperactivity:
Impulsivity:
In addition, some hyperactive, impulsive or inattention symptoms that cause present difficulties were present before 7 years of age and are present in two or more settings (at school [or work] or at home). There must be clear evidence of significant impairment in social, academic, or occupational functioning, and the symptoms are not entirely caused by another severe physical disorder (for example, severe illness associated with chronic pain) or mental disorder (for example, schizophrenia, other psychotic disorders, severe disabling mood disorders, etc.).
Inattention symptoms are most likely to manifest at about 8 to 9 years of age and commonly are lifelong in duration. The delay in onset of inattentive symptoms may reflect its more subtle nature (versus hyperactivity) and/or variability in the maturation of cognitive development. Hyperactivity symptoms are usually obvious by 5 years of age and peak in severity between 7 to 8 years old. With maturation, these behaviors progressively decline and generally have been "outgrown" by adolescence. Impulsive behaviors are commonly linked to hyperactivity and also peak at about 7 to 8 years of age; however, unlike their hyperactive counterpart, impulsivity issues remain well into adulthood. Impulsive adolescents are more likely to experiment with high-risk behaviors (drugs, sexual behavior, driving, etc). Impulsive adults have a higher rate of financial mismanagement (impulse buying, gambling, etc.)
Many children without ADHD demonstrate one or more of these behaviors frequently. The difference between these children and the child with ADHD is that the behaviors are disruptive, are considered inappropriate for the child's developmental stage, persist for months or years, and occur both at home and at school. A child with ADHD almost never exhibits all of the symptoms, but the symptoms that are present appreciably hinder the child's social, psychological, and/or educational development.
The behaviors of ADHD can mimic mood disorders (for example, depression), anxiety, or personality disorder. Those conditions must be ruled out or adequately treated before a definitive diagnosis of ADHD can be made.
A school-age child may need evaluation for ADHD if he or she exhibits any of the following behaviors:
The evaluation of a child suspected of having ADHD is multidisciplinary, involving comprehensive medical, developmental, educational, and psychosocial evaluations. Interviewing parents and the patient along with contact with the patient's teacher(s) is crucial. Investigation regarding the family history for behavioral and/or social problems is helpful. While direct person-to-person contact is considered vital at the outset of an investigation, follow-up studies may be guided by comparing standardized questionnaires (from parents and teachers) completed prior to intervention and subsequent to medication, behavioral therapy, or other treatment approaches. While there is no unique finding on the physical exam in patients with ADHD, unusual physical features should prompt consideration of consultation with a geneticist due to the high association with ADHD behavioral patterns and well-recognized genetic syndromes (for example, fetal alcohol syndrome).
At this time, no lab test, X-ray, imaging study, or procedure is known to suggest or confirm the diagnosis of ADHD. Specific tests may be ordered if indicated by specific symptoms.
Physicians and parents should be aware that schools are federally mandated to perform an appropriate evaluation if a child is suspected of having a disability that impairs academic functioning. This policy was recently strengthened by regulations implementing the 1997 reauthorization of the Individuals With Disabilities Act (IDEA), which guarantees appropriate services and a public education to children with disabilities from ages 3 to 21. If the assessment performed by the school is inadequate or inappropriate, parents may request that an independent evaluation be conducted at the school's expense. Furthermore, some children with ADHD qualify for special-education services within the public schools, under the category of "Other Health Impaired." In these cases, the special-education teacher, school psychologist, school administrators, classroom teachers, along with parents, must assess the child's strengths and weaknesses and design an Individualized Education Program. These special-education services for children with ADHD are available though IDEA.
Despite this "federal mandate," the reality is that many school districts, because of underfunding or understaffing, are unable to perform "an appropriate evaluation" for all children suspected of having ADHD. The districts have the latitude to define the degree of "impairment of academic functioning" necessary to approve "appropriate evaluation." This usually means the children who are failing or near-failing in their academic performance. A very large segment of the ADHD-affected children will be "getting by" (not failing) academically (at least in their early years of school), but they are usually achieving well below their potential and getting more and more behind each year on the academic prerequisite skills necessary for later school success. Thereafter, further educational testing may be requested from the school district. Unfortunately, some families will have to assume the financial burden of an independent educational evaluation. These evaluations are commonly done by an educational psychologist and may involve approximately eight to 10 hours of testing and observation spread out over several sessions. A primary goal of an educational evaluation is to exclude/include the possibility of learning disorders (for example, dyslexia, language disorders, etc.)
No one knows for sure whether the prevalence of ADHD per se has risen, but it is very clear that the number of children identified with the disorder and who obtain treatment has risen over the past decade. Some of this increased identification and increased treatment-seeking is due in part to greater media interest, heightened consumer awareness, and the availability of effective treatments. Teachers are better trained to recognize the condition and suggest that the family seek help, especially in the more mild to moderate cases. The condition itself is so much more clearly defined and more concisely diagnosed now. The diagnosis of ADHD is also less of a social stigma than in the past. This more enlightened perspective reflects the understanding that ADHD is a biochemical disorder and not merely an "out of control child." As such, more parents are receptive to medical therapy for the condition rather than resorting to less effective home/school discipline techniques. Interestingly, the increase in prevalence of ADHD is not solely an American phenomenon but has been noted also in other countries. Whether the number of patients with ADHD has truly increased or rather our better recognition and acceptance of ADHD as a diagnosis has "increased" the number of patients remains to be further defined.
The diagnosis of ADHD in the preschool-aged (under 5 years old) child is possible, but it can be difficult and should be made cautiously by experts well trained in childhood neurobehavioral disorders. A variety of physical problems, emotional problems, developmental problems (especially language delays), and adjustment problems can sometimes imitate ADHD in this age group. It is certainly not mandatory that the preschool-aged child showing ADHD-suggestive symptoms be placed in a preschool. The first line of therapy for children of this age showing ADHD-like symptoms is not stimulant medication therapy but rather environmental or behavioral therapy. This type of therapy can certainly be carried out in the home, with appropriate training supplied to the parents. If the child is to be placed in a preschool, the caretakers must be equally trained in the techniques of behavioral therapy. Stimulant therapy can reduce oppositional behavior and improve mother-child interaction, but it is usually reserved for severe cases or used when a child does not respond to environmental or behavioral interventions.
The two major components of treatment for children with attention deficit hyperactivity disorder (ADHD) are behavioral therapy and medication.
The medications used to treat ADHD are psychoactive. This means they affect the chemistry, and thus the functioning, of the brain.
Psychostimulants are by far the most widely used medications in treating ADHD. When used appropriately, approximately 80% of individuals with ADHD show a very good to excellent response in reduction of symptoms. These medications stimulate and increase activity of areas of the brain with neurotransmitter imbalances.
The exact mechanism of how these drugs relieve symptoms in ADHD is unknown, but these medicines are linked to increases in brain levels of the neurotransmitters dopamine and norepinephrine. Low levels of these neurotransmitters are linked to ADHD.
The psychostimulants most often used in ADHD include the following:
Atomoxetine (Strattera) is a new non-stimulant used to treat ADHD. This medication has been used for several years, and less is known about its long-term side effects. This drug has several benefits over stimulants, but its use may also carry several negative aspects.
Some medications originally developed to treat depression (antidepressants) also have important roles in treating some individuals with ADHD. Since these medicines have been used for many years to treat other mental-health conditions, their adverse effects are well understood.
Other medicines that were originally developed to treat high blood pressure (alpha agonists) may also be useful in the treatment of those having ADHD. Again, due to widespread and long-term use, their side effects are well known to doctors.
Stimulant medications have been successfully used to treat patients with ADHD for more than 50 years. This class of medication, when used under proper medical supervision, has an excellent safety record in patients with ADHD. In general, the side effects of the stimulant class of medications are mild, often transient over time, and reversible with adjustment in dosage amount or interval of administration. The incidence of side effects is highest when administered to preschool-aged children. Common side effects include appetite suppression, sleep disturbances, and weight loss. Less common side effects include an increase in heart rate/blood pressure, headache, and emotional changes (social withdrawal, nervousness, and moodiness). Patients treated with the methylphenidate patch (Daytrana) may develop a skin sensitization at the site of application. Approximately 15%-30% of children treated with stimulant medications develop minor motor tics (involuntary rapid twitching of facial and/or neck and shoulder muscles). These are almost always short-lived and resolve without stopping the use of medication.
A recent investigation studied the possibility of stimulant medication used to treat ADHD and cardiovascular side effects. Concern focused on a possible association with heart attack, heart rate and rhythm disturbances, and stroke. At this time, there is no certainty in a proposed relationship to these events (including sudden death) when medication is used in a pediatric population screened for prior cardiovascular symptoms or structural pathology of the heart. A positive family history for certain conditions (for example, unusual heart rhythm patterns) may be considered a risk factor. The current position of the American Academy of Pediatrics is that a screening EKG is not indicated before the initiation of stimulant medication in a patient without risk factors.
"Diversion" is the transfer of medication from the patient for whom it was prescribed to another individual. Several large studies have indicated that 5%-9% of grade and high school students and 5%-35% of college-aged individuals reported use of non-prescribed stimulant medication, and 16%-29% of students for whom stimulant medications were prescribed reported being approached to give, trade, or sell their medication. Misuse was more frequently seen in whites, members of fraternities and sororities, and students with a lower GPA. Diversion was more likely with the short-acting preparations. The most common reasons cited for use of non-prescribed stimulants were "helped with studying," improved alertness, drug experimentation, and "getting high."
ADHD is a controversial diagnosis for several reasons. Many well-meaning individuals have spoken out against making children behave according to a norm or taking medications for the sake of improving grades. These individuals have expressed concern about addiction or drugging children. This kind of concern is valid; however, the following must also be considered:
The use of psychostimulants in children should be scrutinized carefully. Fortunately, methylphenidate (Ritalin [and its long active formulation, Concerta], historically the most widely prescribed medication for ADHD) has been available for many years. This long period of clinical experience has shown that this is one of the safest medications used in children.
Diet
No specific food or diet has been clearly shown to have a significant positive or negative effect on the symptoms or course of ADHD. People with ADHD should eat a healthy diet and probably avoid caffeine. That having been said, if the family's experience with a person having ADHD is that some sort of dietary change, such as decreased refined sugar intake, helps, then if the person is not deprived of necessary nutrients, there is certainly no harm in trying to follow such a plan. A good rule of thumb is to discuss the plan with the family doctor or whoever is providing the primary treatment for the ADHD symptoms.
Activity
Regular physical activity has been shown to play an important role in some of the common related conditions (for example, depression, anxiety) and to improve concentration. Regular exercise may be beneficial in people with ADHD. Several studies on children with ADHD not taking medication have shown an improvement in concentration and reduction in inattentive and hyperactive behaviors if one hour of vigorous after-school play occurs before starting homework.
Alternative therapies
CAM (complementary and alternative medicine) therapies are considered and/or tried in over half of patients with ADHD. Many times these modalities are used covertly and it is important for the treating physician to inquire about CAM to encourage open communication and review the risks versus benefits of such an approach. CAM treatment modalities incorporating vision training, special diets and megavitamin therapy, herbal and mineral supplements, EEG biofeedback, and applied kinesiology have all been advocated. The benefits of these approaches, however, have not been confirmed in double-blinded controlled studies. Families should be aware that such programs might require a long-term financial commitment that may not have insurance reimbursement as an option.
The primary-care provider, behavioral pediatrician, or child and adolescent psychiatrist will want to see the caregiver and the child often at first to monitor progress and response to therapy. Once the individual's condition is stabilized, follow-up visits will be regular but less frequent.
Federal and state laws grant special educational accommodations for children with ADHD and learning disabilities. Local school districts and regional/state departments of education can provide specific resources available in the local community.
No clear methods for preventing ADHD are currently known. While some people have suggested that certain diets, teaching or parenting methods, or other approaches may keep ADHD from happening, unfortunately, none of these approaches has stood up to rigorous scientific testing so far. On the other hand, once the symptoms have begun and careful assessment has produced an ADHD diagnosis, various specific behavioral and learning techniques can be used by teachers and family to help get symptoms under better control. These should be discussed with the treating doctor so that the right interventions can be applied for the specific person.
Literature supports the clinical observation that as many as 50% of children with ADHD will have symptoms persist into adulthood. One caveat needs to be
The following are current areas of concern:
Attention deficit hyperactivity disorder (ADHD), whether it affects an adult or a child who is affected, brings many challenges. People with ADHD can learn, achieve, succeed, and create a happy life for themselves with effort. But making changes is not always easy. Sometimes it helps to have someone to talk to.
This is the purpose of support groups. Support groups consist of people in the same situation. They come together to help each other and to help themselves. Support groups provide reassurance, motivation, and inspiration. They help individuals see that their situation is not unique and not hopeless, and that gives them power. They also provide practical tips on coping with ADHD and navigating the medical, educational, and social systems that people will rely on for help for themselves or their child. Being in an ADHD support group is strongly recommended by most mental-health professionals.
Support groups meet in person, on the telephone, or on the Internet. To find a support group that works for you, contact the following organizations. You can also ask your health-care provider, behavioral therapist, or education specialist, or look on the Internet.
Attention Deficit Disorder Association
PO Box 7557
Wilmington DE 19803
1-800-939-1019
http://www.add.org
Children and Adults With Attention-Deficit/Hyperactivity Disorder (CHADD)
8181 Professional Place, Suite 150
Landover, MD 20785
1-800-233-4050
http://www.chadd.org
Learning Disabilities Association of America
4156 Library Rd
Pittsburgh, PA 15234-1349
412-341-1515
http://www.ldanatl.org
National Center for Learning Disabilities
381 Park Avenue South, Suite 1401
New York, NY 10016
1-888-575-7373
http://www.ncld.org
National Dissemination Center for Children
With Disabilities (NICHCY)
PO Box 1492
Washington, DC 20013
1-800-695-0285
http://www.nichcy.org
National Institute of Mental Health (NIMH)
6001 Executive Boulevard
Bethesda, MD 20892-9663
1-866-615-6464
ADHD, AD/HD, ADD, ADD/ADHD, attention deficit disorder, attention deficit disorder with and without hyperactivity, attention deficit hyperactivity disorder, attention-deficit hyperactivity disorder, hyperkinetic impulse disorder, hyperactive syndrome, hyperkinetic reaction of childhood, minimal brain damage, minimal brain dysfunction, undifferentiated attention deficit disorder, attention-deficit/hyperactivity disorder, primarily inattentive ADHD, primarily hyperactive-impulsive ADHD, combined ADHD, attention disorder, learning disorders, restless legs syndrome, ophthalmic convergence insufficiency, depression, anxiety disorder, antisocial personality disorder, substance abuse disorder, conduct disorder, obsessive-compulsive behavior, ADHD in adults
Author: John Mersch, MD, FAAP
Editor: Melissa Conrad Stöppler, MD
Previous contributing authors and editors:
Author: Susan Louisa Montauk, MD, Medical Director, Affinity Center; Professor, Department of Family Medicine, University of Cincinnati College of Medicine.
Coauthor(s):
Douglas W Pentz, MA, PhD, Cofounder and Clinical Director, The Affinity Center, Cincinnati, Ohio.
Editors: Ronald C Albucher, MD, Assistant Chief, Psychiatry Service, VA Ann Arbor Healthcare System; Clinical Assistant Professor, Department of Psychiatry, University of Michigan School of Medicine; Francisco Talavera, PharmD, PhD, Senior Pharmacy Editor, eMedicine; Alan D Schmetzer, MD, Professor and Assistant Chair for Education, Department of Psychiatry, Indiana University School of Medicine.
Last Editorial Review: 3/18/2009
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