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The [[British Psychological Society]] said in a 1997 report that physicians and psychiatrists should not follow the American example of applying medical labels to such a wide variety of attention-related disorders: "The idea that children who don’t attend or who don’t sit still in school have a mental disorder is not entertained by most British clinicians."<ref name="Reason R 1999 85–91">{{cite journal |author=Reason R |title=ADHD: a psychological response to an evolving concept. (Report of a Working Party of the British Psychological Society) |journal=Journal of learning disabilities |volume=32 |issue=1 |pages=85–91 |year=1999 |pmid=15499890 |doi= 10.1177/002221949903200108|url=http://ldx.sagepub.com/cgi/pmidlookup?view=long&pmid=15499890}}</ref><ref>http://www.britannica.com/EBchecked/topic/279477/attention-deficithyperactivity-disorder/216017/Controversy-mental-disorder-or-state-of-mind</ref>
The [[British Psychological Society]] said in a 1997 report that physicians and psychiatrists should not follow the American example of applying medical labels to such a wide variety of attention-related disorders: "The idea that children who don’t attend or who don’t sit still in school have a mental disorder is not entertained by most British clinicians."<ref name="Reason R 1999 85–91">{{cite journal |author=Reason R |title=ADHD: a psychological response to an evolving concept. (Report of a Working Party of the British Psychological Society) |journal=Journal of learning disabilities |volume=32 |issue=1 |pages=85–91 |year=1999 |pmid=15499890 |doi= 10.1177/002221949903200108|url=http://ldx.sagepub.com/cgi/pmidlookup?view=long&pmid=15499890}}</ref><ref>http://www.britannica.com/EBchecked/topic/279477/attention-deficithyperactivity-disorder/216017/Controversy-mental-disorder-or-state-of-mind</ref>

However, ten years later, in 2009, the British Psychological Society, in collaboration with the Royal College of Psychiatrists, released a set of guidelines for the diagnosis and treatment of ADHD. <ref>http://www.nice.org.uk/nicemedia/pdf/ADHDFullGuideline.pdf</ref>


==References==
==References==

Revision as of 09:36, 19 September 2009

Attention deficit hyperactivity disorder
SpecialtyPsychiatry, child and adolescent psychiatry Edit this on Wikidata

Attention-deficit/hyperactivity disorder (ADHD or AD/HD) is a neurobehavioral[1] developmental disorder.[2] ADHD is primarily characterized by "the co-existence of attentional problems and hyperactivity, with each behavior occurring infrequently alone."[3] While signs may appear to be innocent and merely annoying nuisances to observers, "if left untreated, the persistent and pervasive effects of ADHD signs can insidiously and severely interfere with one's ability to get the most out of education, fulfill one's potential in the workplace, establish and maintain interpersonal relationships, and maintain a generally positive sense of self."[4]: p.2 

ADHD is the most commonly studied and diagnosed psychiatric disorder in children, affecting about 3 to 5% of children globally with signs starting before seven years of age.[5][6] ADHD is a common chronic disorder in children[7] with 30 to 50% of those individuals diagnosed in childhood continuing to have signs into adulthood.[8][9] Adolescents and adults with ADHD tend to develop coping mechanisms to compensate for some or all of their impairments.[10] However, many aspects of daily life that most people take for granted are rendered more difficult by the signs of ADHD.[4][clarification needed]

Though previously regarded as a childhood diagnosis, ADHD can continue throughout adulthood.[11] 4.7 percent of American adults are estimated to live with ADHD.[12] ADHD is diagnosed two to four times as frequently in boys as in girls,[13][14] though studies suggest this discrepancy may be due to subjective bias of referring teachers.[15] ADHD management usually involves some combination of medications, behavior modifications, lifestyle changes, and counseling. Its signs can be difficult to differentiate from other psychiatric or other disorders, increasing the likelihood that the diagnosis of ADHD will be missed.[4] Additionally, most clinicians have not received formal training in the assessment and treatment of ADHD, particularly in adult patients.[4]

ADHD and its diagnosis and treatment have been considered controversial since the 1970s.[16] The controversies have involved clinicians, teachers, policymakers, parents and the media. Opinions regarding ADHD range from not believing it exists at all to believing there are genetic and physiological bases for the condition as well as disagreement about the use of stimulant medications in treatment.[17][18][19] Most healthcare providers accept that ADHD is a genuine disorder with debate in the scientific community centering mainly around how it is diagnosed and treated.[20][21][22]

Classification

ADHD may be seen as one or more continuous traits found normally throughout the general population.[23] ADHD is a developmental disorder in which certain traits such as impulse control lag in development.[24] Using magnetic resonance imaging of the prefrontal cortex, this developmental lag has been estimated to range from 3 to 5 years.[25] These delays are considered to cause impairment. ADHD has also been classified as a behavior disorder.[26] A diagnosis of ADHD does not, however, imply a neurological disease.[23]

ADHD is classified as a disruptive behavior disorder along with oppositional defiant disorder, conduct disorder and antisocial disorder.[27]

Subtypes

ADHD has three subtypes:[28]

  • Predominantly hyperactive-impulsive
    • Most signs (six or more) are in the hyperactivity-impulsivity categories.
    • Fewer than six signs of inattention are present, although inattention may still be present to some degree.
  • Predominantly inattentive
    • The majority of signs (six or more) are in the inattention category and fewer than six signs of hyperactivity-impulsivity are present, although hyperactivity-impulsivity may still be present to some degree.
    • Children with this subtype are less likely to act out or have difficulties getting along with other children. They may sit quietly, but they are not paying attention to what they are doing. Therefore, the child may be overlooked, and parents and teachers may not notice signs of ADHD.
  • Combined hyperactive-impulsive and inattentive
    • Six or more signs of inattention and six or more signs of hyperactivity-impulsivity are present.
    • Most children have the combined type of ADHD.

Childhood ADHD

Attention Deficit Hyperactivity Disorder or ADHD is a common childhood illness that can be treated. It is a health condition involving biologically active substances in the brain. ADHD may affect certain areas of the brain that allow problem solving, planning ahead, understanding others’ actions, and impulse control.[29]

The American Academy of Child Adolescent Psychiatry (AACAP) considers it necessary that the following be present before attaching the label of ADHD to a child:

  • The behaviors must appear before age 7.
  • They must continue for at least six months.
  • The signs must also create a real handicap in at least two of the following areas of the child’s life:
    • in the classroom,
    • on the playground,
    • at home,
    • in the community, or
    • in social settings.[29]

If a child seems too active on the playground but not elsewhere, the problem might not be ADHD. It might also not be ADHD if the behaviors occur in the classroom but nowhere else. A child who shows some signs would not be diagnosed with ADHD if his or her schoolwork or friendships are not impaired by the behaviors.[29]

Even if a child’s behavior seems like ADHD, it might not actually be ADHD. Many other conditions and situations can trigger behavior that resembles ADHD. For example, a child might show ADHD signs when experiencing:

  • A death or divorce in the family, a parent’s job loss, or other sudden change
  • Undetected seizures
  • An ear infection that causes temporary hearing problems
  • Problems with schoolwork caused by a learning disability
  • Anxiety or depression[29]
  • Insufficient or poor quality sleep

Adult ADHD

Main article: Adult attention-deficit disorder

It has been estimated that about eight million adults have ADHD in the United States.[30] Untreated adults with ADHD often have chaotic lifestyles, may appear to be disorganized and may rely on non-prescribed drugs and alcohol to get by.[31] They often have such associated psychiatric comorbidities as depression, anxiety disorder, bipolar disorder, substance abuse, or a learning disability.[31] A diagnosis of ADHD may offer adults insight into their behaviors and allow patients to become more aware and seek help with coping and treatment strategies.[30] There is controversy amongst some experts on whether ADHD persists into adulthood. Recognized as occurring in adults in 1978, it is currently not addressed separately from ADHD in childhood. Obstacles that clinicians face when assessing adults who may have ADHD include developmentally inappropriate diagnostic criteria, age-related changes, comorbidities and the possibility that high intelligence or situational factors can mask ADHD.[32]

Signs

Inattention, hyperactivity, and impulsivity are the key behaviors of ADHD. The signs of ADHD are especially difficult to define because it is hard to draw the line at where normal levels of inattention, hyperactivity, and impulsivity end and clinically significant levels requiring intervention begin.[4] In children with ADHD, these behaviors are more severe and occur more often. To be diagnosed with the disorder, a child must have signs for 6 or more months and to a degree that is greater than other children of the same age.

The symptom categories of ADHD in children yield three potential classifications of ADHD—predominantly inattentive type, predominantly hyperactive-impulsive type, or combined type if criteria for both subtypes are met:[4]: p.4 

Predominantly inattentive type signs may include:[33]

  • Be easily distracted, miss details, forget things, and frequently switch from one activity to another
  • Have difficulty focusing on one thing
  • Become bored with a task after only a few minutes, unless they are doing something enjoyable
  • Have difficulty focusing attention on organizing and completing a task or learning something new
  • Have trouble completing or turning in homework assignments, often losing things (e.g., pencils, toys, assignments) needed to complete tasks or activities
  • Not seem to listen when spoken to
  • Daydream, become easily confused, and move slowly
  • Have difficulty processing information as quickly and accurately as others
  • Struggle to follow instructions.

Predominantly hyperactive-impulsive type signs may include:[33]

  • Fidget and squirm in their seats
  • Talk nonstop
  • Dash around, touching or playing with anything and everything in sight
  • Have trouble sitting still during dinner, school, and story time
  • Be constantly in motion
  • Have difficulty doing quiet tasks or activities.

and also these manifestations primarily of impulsivity:[33]

  • Be very impatient
  • Blurt out inappropriate comments, show their emotions without restraint, and act without regard for consequences
  • Have difficulty waiting for things they want or waiting their turns in games

Most people exhibit some of these behaviors, but not to the degree where such behaviors significantly interfere with a person's work, relationships, or studies. The core impairments are consistent even in different cultural contexts.[34]

Signs may persist into adulthood for well over half of children diagnosed with ADHD. Estimating this is difficult as there are no official diagnostic criteria for ADHD in adults.[4]

A 2009 study found that children with ADHD move around a lot because it helps them stay alert enough to complete challenging tasks.[35]

ADHD and comorbid disorders

ADHD may accompany other disorders such as anxiety or depression. Such combinations can greatly complicate diagnosis and treatment. Academic studies and research in private practice suggest that depression in ADHD appears to be increasingly prevalent in children as they get older, with a higher rate of increase in girls than in boys, and to vary in prevalence with the subtype of ADHD. Where a mood disorder complicates ADHD it would be prudent to treat the mood disorder first, but parents of children who have ADHD often wish to have the ADHD treated first, because the response to treatment is quicker.[36]

Inattention and "hyperactive" behavior are not the only problems in children with ADHD. ADHD exists alone in only about 1/3 of the children diagnosed with it. Many co-existing conditions require other courses of treatment and should be diagnosed separately instead of being grouped in the ADHD diagnosis. Some of the associated conditions are:


  • Oppositional defiant disorder (35%) and conduct disorder (26%) which both are characterized by anti-social behaviors such as stubbornness, aggression, frequent temper tantrums, deceitfulness, lying, or stealing.[37]
  • Primary disorder of vigilance, which is characterized by poor attention and concentration, as well as difficulties staying awake. These children tend to fidget, yawn and stretch and appear to be hyperactive in order to remain alert and active.[37]
  • Mood disorders. Boys diagnosed with the combined subtype have been shown more likely to suffer from a mood disorder.[38]
  • Bipolar disorder. As many as 25% of children with ADHD have bipolar disorder. Children with this combination may demonstrate more aggression and behavioral problems than those with ADHD alone.[37]
  • Anxiety disorder, which has been found to be more common in girls diagnosed with the inattentive subtype of ADHD.[39]
  • Obsessive-compulsive disorder. OCD is believed to share a genetic component with ADHD and shares many of its characteristics.[37]

Causes

A specific cause of ADHD is not known.[40] There are, however, a number of factors that may contribute to ADHD including genetics, diet and social and physical environments.

Genetic factors

Twin studies indicate that the disorder is highly heritable and that genetics are a factor in about 75% of ADHD cases.[23] Hyperactivity also seems to be primarily a genetic condition; however, other causes do have an effect.[41]

Researchers believe that a large majority of ADHD cases arise from a combination of various genes, many of which affect dopamine transporters. Candidate genes include dopamine transporter, dopamine receptors D2/D3,[42] dopamine beta-hydroxylase monoamine oxidase A, catecholamine-methyl transferase, serotonin transporter promoter (SLC6A4), 5-hydroxytryptamine 2A receptor (5-HT2A), 5-hydroxytryptamine 1B receptor (5-HT1B),[43] the 10-repeat allele of the DAT1 gene,[44] the 7-repeat allele of the DRD4 gene,[44] and the dopamine beta hydroxylase gene (DBH TaqI).[45]

The broad selection of targets indicates that ADHD does not follow the traditional model of a "genetic disease" and should therefore be viewed as a complex interaction among genetic and environmental factors. Even though all these genes might play a role, to date no single gene has been shown to make a major contribution to ADHD.[46]

Evolutionary theories

See also: Hunter vs. farmer theory

The hunter vs. farmer theory is a hypothesis proposed by author Thom Hartmann about the origins of ADHD. The theory proposes that hyperactivity may be an adaptive behavior in pre modern humans.[47] And that those with ADHD retain some of the older "hunter" characteristics associated with early pre-agricultural human society. According to this theory, individuals with ADHD may be more adept at searching and seeking and less adept at staying put and managing complex tasks over time. [48] Further evidence showing hyperactivity may be evolutionarily beneficial was put forth in 2006 in a study which found it may carry specific benefits for a society.[49]

Environmental factors

Twin studies to date have also suggested that approximately 9% to 20% of the variance in hyperactive-impulsive-inattentive behavior or ADHD signs can be attributed to nonshared environmental (nongenetic) factors.[50][51]

Environmental factors implicated include alcohol and tobacco smoke exposure during pregnancy and environmental exposure to lead in very early life.[52] The relation of smoking to ADHD could be due to nicotine causing hypoxia (lack of oxygen) to the fetus in utero.[53] It could also be that women with ADHD are more likely to smoke[54] and therefore, due to the strong genetic component of ADHD, are more likely to have children with ADHD.[55] Complications during pregnancy and birth—including premature birth—might also play a role.[56] ADHD patients have been observed to have higher than average rates of head injuries;[57] however, current evidence does not indicate that head injuries are the cause of ADHD in the patients observed.[58]

Diet

Main article: Diet and attention deficit hyperactivity disorder

A study conducted by researchers at Southampton University in the United Kingdom and published in The Lancet on November 3, 2007 found a definitive link between children’s ingestion of many commonly used artificial food colors, the preservative sodium benzoate and hyperactivity. In response to these findings, the British government took prompt action. According to the Food Standards Agency, the food regulatory agency in the UK, food manufacturers are being encouraged to voluntarily phase out the use of most artificial food colors by the end of 2009. Following the FSA’s actions, the European Commission ruled that any food products containing the “Southampton Six” must display warning labels on their packaging by 2010. In the US, little has been done to curb food manufacturer’s use of artificial food colors, despite the new evidence presented by the Southampton study.

Social factors

There is no compelling evidence that social factors alone can cause ADHD.[24] However, many researchers believe that relationships with caregivers have a profound effect on attentional and self-regulatory abilities. A study of foster children found that a high number of them had signs closely resembling ADHD,[59] while other researchers have found behavior typical of ADHD in children who have suffered violence and emotional abuse.[23][60] Furthermore, Complex Post Traumatic Stress Disorder can result in attention problems that can look like ADHD.[61] ADHD is also considered to be related to sensory integration dysfunction.[62]

Neurodiversity

Main article: Neurodiversity

Proponents of this theory assert that atypical (neurodivergent) neurological development is a normal human difference that is to be tolerated and respected just like any other human difference. Social critics argue that while biological factors may play a large role in difficulties with sitting still in class and/or concentrating on schoolwork in some children, these children could have failed to integrate others' social expectations of their behavior for a variety of other reasons.[63] Others have said that ADHD has a link with creativity.[64] As genetic research into ADHD proceeds, it may become possible to integrate this information with the neurobiology in order to distinguish disability from varieties of normal or even exceptional functioning in people along the same spectrum of attention differences. [65]

Social construct theory of ADHD

Main article: Social construct theory of ADHD

Social construction theory states that it is societies that determine where the line between normal and abnormal behavior is drawn. Thus the members of societies ( physicians, parents, teachers, and others ) are the ones who determine which diagnostic criteria are applied and thus determine the number of people affected.[66] This is exemplified in the fact that the DSM IV arrives at levels of ADHD three to four times higher than that of obtained with use of the ICD 10.[14] Thomas Szasz, an extreme proponent of this theory, has gone so far as to state that ADHD was "invented and not discovered."[67][68]

Low arousal theory

Main article: Low arousal theory

According to the low arousal theory, people with ADHD need excessive activity as self-stimulation because of their state of abnormally low arousal.[69][70] The theory states that those with ADHD cannot self-moderate, and their attention can only be gained by means of environmental stimuli,[69] which in turn results in disruption of attentional capacity and an increase in hyperactive behaviour.[71]

Without enough stimulation coming from the environment, an ADHD child will create it him or herself by walking around, fidgeting, talking, etc. This theory also explains why stimulant medications have high success rates and can induce a calming effect at therapeutic dosages among children with ADHD. It establishes a strong link with scientific data that ADHD is connected to abnormalities with the neurochemical dopamine and a powerful link with low-stimulation PET scan results in ADHD subjects.[69]

Pathophysiology

Diagram of a human brain.

The pathophysiology of ADHD is unclear and there are a number of competing theories.[72] Research on children with ADHD has shown a general reduction of brain volume, but with a proportionally greater reduction in the volume of the left-sided prefrontal cortex. These findings suggest that the core ADHD features of inattention, hyperactivity, and impulsivity may reflect frontal lobe dysfunction but other brain regions particularly the cerebellum have also been implicated.[73] Neuroimaging studies in ADHD have not always given consistent results and as of 2008 are only used for research not diagnostic purposes.[74]

In one study a delay in development of certain brain structures by an average of three years occurred in ADHD elementary school aged patients. The delay was most prominent in the frontal cortex and temporal lobe, which are believed to be responsible for the ability to control and focus thinking. In contrast, the motor cortex in the ADHD patients was seen to mature faster than normal, suggesting that both slower development of behavioral control and advanced motor development might be required for the fidgetiness that characterizes ADHD.[75] It should be noted that stimulant medication itself may affect growth factors of the central nervous system.[76]

The same laboratory had previously found involvement of the "7-repeat" variant of the dopamine D4 receptor gene, which accounts for about 30 percent of the genetic risk for ADHD, in unusual thinness of the cortex of the right side of the brain; however, in contrast to other variants of the gene found in ADHD patients, the region normalized in thickness during the teen years in these children, coinciding with clinical improvement.[77]

Additionally, SPECT scans found people with ADHD to have reduced blood circulation (indicating low neural activity),[78] and a significantly higher concentration of dopamine transporters in the striatum which is in charge of planning ahead.[79][80] A study by the U.S. Department of Energy’s Brookhaven National Laboratory in collaboration with Mount Sinai School of Medicine in New York suggest that it is not the dopamine transporter levels that indicate ADHD, but the brain's ability to produce dopamine itself. The study was done by injecting 20 ADHD subjects and 25 control subjects with a radiotracer that attaches itself to dopamine transporters. The study found that it was not the transporter levels that indicated ADHD, but the dopamine itself. ADHD subjects showed lower levels of dopamine across the board. They speculated that since ADHD subjects had lower levels of dopamine to begin with, the number of transporters in the brain was not the telling factor. In support of this notion, plasma homovanillic acid, an index of dopamine levels, was found to be inversely related not only to childhood ADHD signs in adult psychiatric patients, but to "childhood learning problems" in healthy subjects as well.[81]

A 1990 PET scan study by Alan J. Zametkin et al. found that global cerebral glucose metabolism was 8% lower in medication-naive adults who had been hyperactive since childhood.[82] Further studies found that chronic stimulant treatment had little effect on global glucose metabolism,[83] a study in girls failed to find a decreased global glucose metabolism,[84] and in teenagers PET scans were unable to differentiate normal children from those with ADHD.[85] The significance of the research by Zametkin has not been determined and neither his group nor any other has been able to replicate the 1990 results.[86][87][88]

Critics, such as Jonathan Leo and David Cohen, who reject the characterization of ADHD as a disorder, contend that the controls for stimulant medication usage were inadequate in some lobar volumetric studies which makes it impossible to determine whether ADHD itself or psychotropic medication used to treat ADHD is responsible for the decreased thickness observed[89] in certain brain regions. Other methodological problems include the two year age difference as well height and weight differences between the medicated and unmedicated groups. These variables it has been argued could account for the regional brain size differences rather than ADHD itself.[90][91] They believe many neuroimaging studies are oversimplified in both popular and scientific discourse and given undue weight despite deficiencies in experimental methodology.[90]

Diagnosis

ADHD is diagnosed via a psychological assessment; to rule out other potential causes or comorbidities, physical examination, radiological imaging, and laboratory tests may be used.[92]

In North America, the DSM-IV criteria are often the basis for a diagnosis, while European countries usually use the ICD-10.[93] If the DSM-IV criteria is used rather than the ICD-10 a diagnosis ADHD is 3–4 times more likely.[14] Factors other than those within the DSM or ICD however have been found to effect the diagnosis in clinical practice. A child's social and school environment as well as academic pressures at school are likely to be of influence.[94]

Many of the signs of ADHD occur from time to time in everyone; in patients with ADHD, the frequency of these signs is greater and patients' lives are significantly impaired. Impairment must occur in multiple settings to be classified as ADHD. As with many other psychiatric and medical disorders, the formal diagnosis is made by a qualified professional in the field based on a set number of criteria. In the USA these criteria are laid down by the American Psychiatric Association in their Diagnostic and Statistical Manual of Mental Disorders (DSM-IV), 4th edition. Based on the DSM-IV criteria listed below, three types of ADHD are classified:

  1. ADHD, Combined Type: if both criteria 1A and 1B are met for the past 6 months
  2. ADHD Predominantly Inattentive Type: if criterion 1A is met but criterion 1B is not met for the past six months
  3. ADHD, Predominantly Hyperactive-Impulsive Type: if criterion 1B is met but criterion 1A is not met for the past six months.

The previously used term ADD expired with the most recent revision of the DSM. Consequently, ADHD is the current nomenclature used to describe the disorder as one distinct disorder which can manifest itself as being a primary deficit resulting in hyperactivity/impulsivity (ADHD, predominately hyperactive-impulsive type) or inattention (ADHD predominately inattentive type) or both (ADHD combined type).

DSM-IV criteria

I. Either A or B:[95]

EITHER
(A.) Six or more of the following signs of inattention have been present for at least 6 months to a point that is disruptive and inappropriate for developmental level:
  • Inattentive:
  1. Often does not give close attention to details or makes careless mistakes in schoolwork, work, or other activities.
  2. Often has trouble keeping attention on tasks or play activities.
  3. Often does not seem to listen when spoken to directly.
  4. Often does not follow instructions and fails to finish schoolwork, chores, or duties in the workplace (not due to oppositional behavior or failure to understand instructions).
  5. Often has trouble organizing activities.
  6. Often avoids, dislikes, or doesn't want to do things that take a lot of mental effort for a long period of time (such as schoolwork or homework).
  7. Often loses things needed for tasks and activities (such as toys, school assignments, pencils, books, or tools).
  8. Is often easily distracted.
  9. Often forgetful in daily activities.
OR
(B.) Six or more of the following signs of hyperactivity-impulsivity have been present for at least 6 months to an extent that is disruptive and inappropriate for developmental level:
  • Hyperactivity:
  1. Often fidgets with hands or feet or squirms in seat.
  2. Often gets up from seat when remaining in seat is expected.
  3. Often runs about or climbs when and where it is not appropriate (adolescents or adults may feel very restless).
  4. Often has trouble playing or enjoying leisure activities quietly.
  5. Is often "on the go" or often acts as if "driven by a motor".
  6. Often talks excessively.
  • Impulsiveness:
  1. Often blurts out answers before questions have been finished.
  2. Often has trouble waiting one's turn.
  3. Often interrupts or intrudes on others (example: butts into conversations or games).

II. Some signs that cause impairment were present before age 7 years.

III. Some impairment from the signs is present in two or more settings (such as at school/work and at home).

IV. There must be clear evidence of significant impairment in social, school, or work functioning.

V. The signs do not happen only during the course of a Pervasive Developmental Disorder, Schizophrenia, or other Psychotic Disorder. The signs are not better accounted for by another mental disorder (such as Mood Disorder, Anxiety Disorder, Dissociative Identity Disorder, or a Personality Disorder).

ICD-10

In the tenth edition of the International Statistical Classification of Diseases and Related Health Problems (ICD-10) the signs of ADHD are given the name "Hyperkinetic disorders". When a conduct disorder (as defined by ICD-10[96]) is present, the condition is referred to as "Hyperkinetic conduct disorder". Otherwise the disorder is classified as "Disturbance of Activity and Attention", "Other Hyperkinetic Disorders" or "Hyperkinetic Disorders, Unspecified". The latter is sometimes referred to as, "Hyperkinetic Syndrome".[96]

Other diagnostic guidelines

The American Academy of Pediatrics Clinical Practice Guideline for children with ADHD emphasizes that a reliable diagnosis is dependent upon the fulfillment of three criteria:[97]

  • The use of explicit criteria for the diagnosis using the DSM-IV-TR.
  • The importance of obtaining information about the child’s signs in more than one setting.
  • The search for coexisting conditions that may make the diagnosis more difficult or complicate treatment planning.

All three criteria are determined using the patient's history given by the parents, teachers and/or the patient.

Adults often continue to be impaired by ADHD. Adults with ADHD are diagnosed under the same criteria, including the stipulation that their signs must have been present prior to the age of seven.[95] Adults face some of their greatest challenges in the areas of self-control and self-motivation, as well as executive functioning, usually having more signs of inattention and fewer of hyperactivity or impulsiveness than children do.[98]

Comorbid conditions

Common comorbid conditions include oppositional defiant disorder (ODD). About 20% to 25% of children with ODD meet criteria for a learning disorder.[99] Learning disorders are more common when there are inattention signs.[100]

Comorbid disorders or substance abuse can make the diagnosis and treatment of ADHD more difficult. Psychosocial therapy is useful in treating some comorbid conditions.[101] ADHD is not, in boys, associated with increased substance misuse unless there is comorbid conduct disorder; but "research needs to examine the extent to which ADHD in adulthood increases the risk of substance use disorders."[102]

Depression may also coincide with ADHD, increasingly prevalent among girls and older children.[36]

Epilepsy is a commonly found comorbid disorder in ADHD diagnosed individuals. Some forms of epilepsy can also cause ADHD like behaviour which can be misdiagnosed as ADHD.[103][104]

Differential diagnoses

To make the diagnosis of ADHD, a number of other possible medical and psychological conditions must be excluded.

Medical conditions

Medical conditions that must be excluded include: hypothyroidism, anemia, lead poisoning, chronic illness, hearing or vision impairment, substance abuse, medication side effects, sleep impairment and child abuse, among others.[105]

Sleep conditions

As with other psychological and neurological issues, the relationship between ADHD and sleep is complex. In addition to clinical observations, there is substantial empirical evidence from a neuroanatomic standpoint to suggest that there is considerable overlap in the central nervous system centers that regulate sleep and those that regulate attention/arousal.[106] Primary sleep disorders play a role in the clinical presentation of signs of inattention and behavioral dysregulation. There are multilevel and bidirectional relationships among sleep, neurobehavioral functioning and the clinical syndrome of ADHD.[107]

Behavioral manifestations of sleepiness in children range from classic manifestations (yawning, rubbing eyes), to externalizing behaviors (impulsivity, hyperactivity, aggressiveness), to mood lability and inattentiveness.[106][108]

From a clinical standpoint, mechanisms that account for the phenomenon of excessive daytime sleepiness include:

All of these are important causes of signs which may overlap with the cardinal signs of ADHD and children with ADHD should be regularly and systematically assessed for sleep problems.[106][109]

Management

Main article: Attention-deficit hyperactivity disorder management

Methods of treatment often involve some combination of behavior modification, life-style changes, counseling, and medication. A 2005 study found that medical management and behavioral treatment is the most effective ADHD management strategy, followed by medication alone, and then behavioral treatment.[110] While medication has been shown to improve behavior when taken over the short term, they have not been shown to alter long term outcomes.[111]

Behavioral interventions

A 2009 review concluded that the evidence is strong for the effectiveness of behavioral treatments in ADHD.[112]

Psychological therapies used to treat ADHD include psychoeducational input, behavior therapy, cognitive behavioral therapy (CBT), interpersonal psychotherapy (IPT), family therapy, school-based interventions, social skills training and parent management training.[23]

Parent training and education have been found to have short term benefits.[113] Family therapy has shown to be of little use in the treatment of ADHD,[114] though it may be worth noting that parents of children with ADHD are more likely to divorce than parents of children without ADHD, particularly when their children are younger than eight years old.[115]

Several ADHD specific support groups exist as informational sources and to help families cope with challenges associated with dealing with ADHD.

A 2009 study found that children with ADHD move around a lot because it helps them stay alert enough to complete challenging tasks. The researcher advises that when they are doing homework, one should let them fidget, stand or chew gum since it may help them cope. Unless their behavior is destructive, severely limiting their activity could be counterproductive.[35]

Pharmacological treatment

Management with medication has been shown to be the most cost-effective, followed by behavioral treatment and combined treatment in a 14 month follow-up study.[110] However, a longer follow-up study of 3 years found that stimulant medication offered no benefits over behavioural therapy.[116] Stimulant medication or non-stimulant medication may be prescribed. A 2007 drug class review found that there are no good studies of comparative effectiveness between various drugs for ADHD and that there is a lack of quality evidence on their effects on overall academic performance and social behaviors.[117] The long term effects of ADHD medications in preschool children are unknown and are not recommended for pre-school children.[23][118] There is very little data on the long-term adverse effects or benefits of stimulants for ADHD.[119]

Stimulant medication

Stimulants are the most commonly prescribed medications for ADHD. The most common stimulant medications are the chain subsitituted amphetamine methylphenidate (Ritalin, Metadate, Concerta), dextroamphetamine (Dexedrine), mixed amphetamine salts (Adderall)[120][121], dextromethamphetamine (Desoxyn)[122] and lisdexamfetamine (Vyvanse).[123]

A meta analysis of clinical trials found that about 70% of children improve after being treated with stimulants in the short term but found that this conclusion may be biased due to the high number of low quality clinical trials in the literature. There have been no randomised placebo controlled clinical trials investigating the long term effectiveness of methylphenidate (Ritalin) beyond 4 weeks. Thus the long term effectiveness of methylphenidate has not been scientifically demonstrated. Serious concerns of publication bias regarding the use of methylphenidate for ADHD has also been noted.[124]

Higher rates of schizophrenia and bipolar disorder as well as increased severity of these disorders occur in individuals with a past history of stimulant use for ADHD in childhood.[125]

Both children with and without ADHD abuse stimulants, with ADHD individuals being at the highest risk of abusing or diverting their stimulant prescriptions. Between 16 and 29 percent of students who are prescribed stimulants report diverting their prescriptions. Between 5 and 9 percent of grade/primary and high school children and between 5 and 35 percent of college students have used nonprescribed stimulants. Most often their motivation is to concentrate, improve alertness, "get high," or to experiment.[126]

Stimulants used to treat ADHD raise the extracellular concentrations of the neurotransmitters dopamine and norepinephrine which causes an increase in neurotransmission. The therapeutic benefits are due to noradrenergic effects at the locus coeruleus and the prefrontal cortex and dopaminergic effects at the nucleus accumbens. [127]

One study found that children with ADHD actually need to move more to maintain the required level of alertness while performing tasks that challenge their working memory. Performing math problems mentally and remembering multi-step directions are examples of tasks that require working memory, which involves remembering and manipulating information for a short time. These findings may also explain why stimulant medications improve the behavior of most children with ADHD. Those medications improve the physiological arousal of children with ADHD, increasing their alertness.[35] Previous studies have shown that stimulant medications temporarily improve working memory abilities.

Although "under medical supervision, stimulant medications are considered safe",[97][128] the use of stimulant medications for the treatment of ADHD has generated controversy because of undesirable side effects, uncertain long term effects[11][129][130][131][132] and social and ethical issues regarding their use and dispensation. The FDA has added black-box warnings to some ADHD medications,[133][134] while the American Heart Association and the American Academy of Pediatrics feel that it is prudent to carefully assess children for heart conditions before treating them with stimulant medications.[135]

Non-stimulant medication

Atomoxetine (Strattera) is currently the only non-stimulant drug approved for the treatment of ADHD. Other medications which may be prescribed off-label include alpha-2A adrenergic receptor blockers such as guanfacine and clonidine, certain antidepressants such as tricyclic antidepressants, SNRIs or MAOIs.[136][137][138][139]

Another non-stimulant drug that has been used to treat ADHD is the analeptic drug modafinil. There have been double-blind randomised controlled trials that have demonstrated the efficacy and tolerability of modafinil[140][141], however there are risks of serious side effects such as skin reactions and modafinil is not recommended for use in children.[142]

Experimental treatments

Dietary supplements and specialized diets are sometimes used by people with ADHD with the intent to mitigate some or all of the signs. For example, Omega-3 supplementation may reduce ADHD signs for a subgroup of children and adolescents with ADHD "characterized by inattention and associated neurodevelopmental disorders."[143] Although vitamin or mineral supplements (micronutrients) may help children diagnosed with particular deficiencies, there is no evidence that they are helpful for all children with ADHD. Furthermore, megadoses of vitamins, which can be toxic, must be avoided.[144] In the United States, no dietary supplement has been approved for the treatment for ADHD by the FDA.[145]

EEG biofeedback is a treatment strategy used for children, adolescents and adults with ADHD.[146] The human brain emits electrical energy which is measured with electrodes on the brain. Biofeedback alerts the patient when beta waves are present. This theory believes that those with ADHD can train themselves to decrease ADHD signs. There is a distinct split in the scientific about the effectiveness of the treatment. A number of studies indicates that the scientific evidence has been increasing in recent years for the effectiveness of EEG biofeedback for the treatment of ADHD. According to a 2007 review, with effectiveness of the treatment was demonstrated to be equivalent to that of stimulant medication. The review noted, improvements are seen at the behavioral and neuropsychological level with the signs of inattention, hyperactivity and impulsivity showing significant decreases after treatment. There are no known side effects from EEG biofeedback therapy. There are methodological limitations and weaknesses in study designs however. In a 2005 review, Loo and Barkley stated that problems including lack of blinding such as placebo control and randomisation are significant limitations to the studies into EEG biofeedback and make definitive conclusions impossible to make.[147] As a result more robust clinical studies have been strongly recommended.[148] A German review in 2004 found that EEG biofeedback, also sometimes referred to as neurofeedback, is more effective than previously thought in treating attention deficiency, impulsivity and hyperactivity; short-term effects match those of stimulant treatment and a persistent normalization of EEG parameters is found which is not found after treatment with stimulants.[149] There are no known side effects from biofeedback therapy although research into biofeedback has been limited and further research has been recommended.[149] An American review the following year also emphasized the benefits of this method.[150] Similar findings were reported in a study by another German team in 2004.[151]

Aerobic fitness may improve cognitive functioning and neural organization related to executive control during pre-adolescent development, though more studies are needed in this area.[152] One study suggests that athletic performance in boys with ADHD may increase peer acceptance when accompanied by fewer negative behaviors.[153]

Prognosis

Children diagnosed with ADHD have significant difficulties in adolescence, regardless of treatment.[154] In the United States, 37% of those with ADHD do not get a high school diploma even though many of them will receive special education services.[24] A 1995 briefing citing a 1994 book review says the combined outcomes of the expulsion and dropout rates indicate that almost half of all ADHD students never finish high school.[155] Also in the US, less than 5% of individuals with ADHD get a college degree[156] compared to 28% of the general population.[157] Those with ADHD as children are at increased risk of a number of adverse life outcomes once they become teenagers. These include a greater risk of auto crashes, injury and higher medical expenses, earlier sexual activity, and teen pregnancy.[158] Russell Barkley states that adult ADHD impairments affect "education, occupation, social relationships, sexual activities, dating and marriage, parenting and offspring psychological morbidity, crime and drug abuse, health and related lifestyles, financial management, or driving. ADHD can be found to produce diverse and serious impairments".[159] The proportion of children meeting the diagnostic criteria for ADHD drops by about 50% over three years after the diagnosis. This occurs regardless of the treatments used and also occurs in untreated children with ADHD.[105][131][160] ADHD persists into adulthood in about 30-50% of cases.[8] Those affected are likely to develop coping mechanisms as they mature, thus compensating for their previous ADHD.[10]

Epidemiology

ADHD's global prevalence is estimated at 3-5% in people under the age of 19. There is, however, both geographical and local variability among studies. Geographically, children in North America appear to have a higher rate of ADHD than children in Africa and the Middle East,[161] well published studies have found rates of ADHD as low as 2% and as high as 14% among school aged children.[26] The rates of diagnosis and treatment of ADHD are also much higher on the East Coast of the USA than on the West Coast.[162] The frequency of the diagnosis differs between male children (10%) and female children (4%) in the United States.[163] This difference between genders may reflect either a difference in susceptibility or that females with ADHD are less likely to be diagnosed than males.[164]

Rates of ADHD diagnosis and treatment have increased in both the UK and the USA since the 1970s. In the UK an estimated 0.5 per 1,000 children had ADHD in the 1970s, while 3 per 1,000 received ADHD medications in the late 1990s. In the USA in the 1970s 12 per 1,000 children had the diagnosis, while in the late 1990s 34 per 1,000 had the diagnosis and the numbers continue to increase.[23]

In the UK in 2003 a prevalence of 3.6% is reported in male children and less than 1% is reported in female children.[165]

As of 2009, eight percent of all Major League Baseball players have been diagnosed with ADHD, making the disease epidemic among this population. The increase coincided with the League's 2006 ban on stimulants (q.v. Major League Baseball drug policy).[166]

History

Main article: History of attention-deficit hyperactivity disorder

Hyperactivity has long been part of the human condition. Sir Alexander Crichton describes "mental restlessness" in his 1798 book.[167][168] The terminology used to describe the signs of ADHD has gone through many changes over history including: "minimal brain damage", "minimal brain dysfunction", "learning/behavioral disabilities" and "hyperactivity". In the DSM-II (1968) it was the "Hyperkinetic Reaction of Childhood". In the DSM-III "ADD (Attention-Deficit Disorder) with or without hyperactivity" was introduced. In 1987 this was changed to ADHD in the DSM-III-R and subsequent editions.[169] The use of stimulants to treat ADHD was first described in 1937.[170]

Society and Culture

The media has reported on many issues related to ADHD. In 2001 PBS's Frontline aired a one-hour program about the effects of the diagnosing and treating of ADHD in minors, entitled "Medicating Kids."[171] The program included a selection of interviews with representatives of various points of view. In one segment, entitled Backlash, retired neurologist Fred Baughman and Peter Breggin who PBS described as "outspoken critics who insist [ADHD is] a fraud perpetrated by the psychiatric and pharmaceutical industries on families anxious to understand their children's behavior"[172] were interviewed on the legitimacy of the disorder. Russell Barkley and Xavier Castellanos, then head of ADHD research at the National Institute of Mental Health (NIMH), defended the viability of the disorder. In Castellanos's interview he stated how little is scientifically understood.[173] Lawrence Diller was interviewed on the business of ADHD along with a representative from Shire Plc.[citation needed]

A number of notable individuals have given controversial opinions on ADHD. Scientologist Tom Cruise's interview with Matt Lauer was widely watched by the public. In this interview he spoke about postpartum depression and also referred to Ritalin and Adderall as being "street drugs" rather than as ADHD medication.[174] In England Baroness Susan Greenfield, a leading neuroscientist,[175] spoke out publicly about the need for a wide-ranging inquiry in the House of Lords into the dramatic increase in the diagnosis of ADHD in the UK and possible causes[176] following a 2007 BBC Panorama programme which highlighted US research (The Multimodal Treatment Study of Children with ADHD by the University of Buffalo showing treatment results of 600) suggesting drugs are no better than therapy for ADHD in the long-term.[citation needed]

Controversies

Main article: Attention-deficit hyperactivity disorder controversies

ADHD and its diagnosis and treatment have been considered controversial since the 1970s.[177][18][178] The controversies have involved clinicians, teachers, policymakers, parents and the media. Opinions regarding ADHD range from not believing it exists at all to believing there are genetic and physiological bases for the condition as well as disagreement about the use of stimulant medications in treatment.[17][18][179] Most healthcare providers accept that ADHD is a genuine disorder with debate in the scientific community centering mainly around how it is diagnosed and treated.[20][180][22]

Others have included that it may stem from a misunderstanding of the diagnostic criteria and how they are utilized by clinicians,[4]: p.3  teachers, policymakers, parents and the media.[181] Debates center around: whether ADHD is a disability or whether it is merely a neurological description, the cause of the disorder, the changing of the diagnostic criteria, and the rapid increase in diagnosis of ADHD and the use of stimulants to treat the disorder.[182] Some do not believe it exists at all.[181] Long term possible side effects of stimulants and their usefulness are largely unknown because of a lack of long term studies.[183] Some research raises questions about the long term effectiveness and side effects of medications used to treat ADHD.[184]

In 1998, the US National Institutes of Health (NIH) released a consensus statement on the diagnosis and treatment of ADHD. The statement, while recognizing that stimulant treatment is controversial, supports the validity of the ADHD diagnosis and the efficacy of stimulant treatment. It found controversy only in the lack of sufficient data on long-term use of medications, and in the need for more research in many areas.[185]

The British Psychological Society said in a 1997 report that physicians and psychiatrists should not follow the American example of applying medical labels to such a wide variety of attention-related disorders: "The idea that children who don’t attend or who don’t sit still in school have a mental disorder is not entertained by most British clinicians."[186][187]

However, ten years later, in 2009, the British Psychological Society, in collaboration with the Royal College of Psychiatrists, released a set of guidelines for the diagnosis and treatment of ADHD. [188]

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  188. ^ http://www.nice.org.uk/nicemedia/pdf/ADHDFullGuideline.pdf
Bibliography

Dr Jennifer Erkulwater; Dr Rick Mayes; Dr Catherine Bagwell (2009). Medicating Children: ADHD and Pediatric Mental Health. Cambridge: Harvard University Press. p. 5. ISBN 0-674-03163-6.{{cite book}}: CS1 maint: multiple names: authors list (link)

Further reading

Look up ADHD, ADHD-PI, ADHD-C, or ADHD-PH/I in Wiktionary, the free dictionary.
  • Barkley, Russell A. Take Charge of ADHD: The Complete Authoritative Guide for Parents (2005) New York: Guilford Publications.
  • Conrad, Peter Identifying Hyperactive Children (Ashgate, 2006).
  • Crawford, Teresa I'm Not Stupid! I'm ADHD!
  • Faraone, Stephen V. (2005). The scientific foundation for understanding attention-deficit/hyperactivity disorder as a valid psychiatric disorder. Eur Child Adolesc Psychiatry 14, 1-10.
  • Faraone, Stephen, V.Straight Talk about Your Child's Mental Health: What to Do When Something Seems Wrong (2003) New York:Guilford Press
  • Green, Christopher, Kit Chee, Understanding ADD; Doubleday 1994; ISBN 0-86824-587-9
  • Hanna, Mohab. (2006) Making the Connection: A Parent's Guide to Medication in ADHD, Washington D.C.: Ladner-Drysdale.
  • Hartmann, Thom (2003). The Edison gene: ADHD and the gift of the hunter child. Rochester, Vt: Park Street Press. ISBN 0-89281-128-5.
  • Matlen, Terry. (2005) "Survival Tips for Women with AD/HD". ISBN 1-886941-59-9
  • Ninivaggi, F.J. "Attention-Deficit/Hyperactivity Disorder in Children and Adolescents: Rethinking Diagnosis and Treatment Implications for Complicated Cases", Connecticut Medicine. September 1999; Vol. 63, No. 9, 515-521. PMID 10531701
  • Southall, Angela (2007). The Other Side of ADHD:Attention Deficit Hyperactivity Disorder Exposed and Explained. Radcliffe Publishing Ltd. ISBN 1846190681. Retrieved 2009-05-02.

Adult ADHD

  • Kelly, Kate, Peggy Ramundo. (1993) You Mean I'm Not Lazy, Stupid or Crazy?! A Self-Help Book for Adults with Attention deficit Disorder. ISBN 0-684-81531-1
  • Ratey, Nancy. (2008) The Disorganized Mind: Coaching Your ADHD Brain to Take Control of Your Time, Tasks, and Talents. ISBN 0312355335
  • Weiss, Lynn. (2005) Attention Deficit Disorder in Adults, 4th Edition: A Different Way of Thinking ISBN 1589792378

External links

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