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Mania is generally characterized by a distinct period of an elevated, expansive, or irritable mood state. People commonly experience an increase in energy and a decreased need for sleep. A person's speech may be pressured, with thoughts experienced as racing. Attention span is low and a person in a manic state may be easily distracted. Judgment may become impaired; sufferers may go on spending sprees or engage in behavior that is quite abnormal for them. They may indulge in substance abuse, particularly alcohol or other depressants, cocaine or other stimulants, or sleeping pills. Their behavior may become aggressive, intolerant or intrusive. People may feel out of control or unstoppable. People may feel they have been "chosen", are "on a special mission", or other grandiose or delusional ideas. Sexual drive may increase. At more extreme phases of bipolar I, a person in a manic state can begin to experience [[psychosis]], or a break with reality, where thinking is affected along with mood.<ref>[http://www.nimh.nih.gov/health/publications/bipolar-disorder/complete-publication.shtml#pub2 NIMH · Bipolar Disorder · Complete Publication<!-- Bot generated title -->]</ref> Many people in a manic state experience severe [[anxiety]] and are very irritable (to the point of rage), while others are [[Euphoria (emotion)|euphoric]] and grandiose.
Mania is generally characterized by a distinct period of an elevated, expansive, or irritable mood state. People commonly experience an increase in energy and a decreased need for sleep. A person's speech may be pressured, with thoughts experienced as racing. Attention span is low and a person in a manic state may be easily distracted. Judgment may become impaired; sufferers may go on spending sprees or engage in behavior that is quite abnormal for them. They may indulge in substance abuse, particularly alcohol or other depressants, cocaine or other stimulants, or sleeping pills. Their behavior may become aggressive, intolerant or intrusive. People may feel out of control or unstoppable. People may feel they have been "chosen", are "on a special mission", or other grandiose or delusional ideas. Sexual drive may increase. At more extreme phases of bipolar I, a person in a manic state can begin to experience [[psychosis]], or a break with reality, where thinking is affected along with mood.<ref>[http://www.nimh.nih.gov/health/publications/bipolar-disorder/complete-publication.shtml#pub2 NIMH · Bipolar Disorder · Complete Publication<!-- Bot generated title -->]</ref> Many people in a manic state experience severe [[anxiety]] and are very irritable (to the point of rage), while others are [[Euphoria (emotion)|euphoric]] and grandiose.


In order to be diagnosed with mania according to the Diagnostic and Statistical Manual of Mental Disorders (commonly referred to as the DSM) a person must experience this state of elevated or irritable mood, as well as other symptoms, for at least one week, less if hospitalization is required. According to the National Institute of Mental Health, "A manic episode is diagnosed if elevated mood occurs with three or more of the other symptoms most of the day, nearly every day, for 1 week or longer. If the mood is irritable, four additional symptoms must be present."<ref>[http://www.nimh.nih.gov/health/publications/bipolar-disorder/complete-publication.shtml NIMH · Bipolar Disorder · Complete Publication<!-- Bot generated title -->]</ref>
In order to be diagnosed with mania according to the Diagnostic and Statistical Manual of Mental Disorders (commonly referred to as the DSM) a person must experience this state of elevated or irritable mood, as well as other symptoms, for at least one week, less if hospitalization is required. According to the National Institute of Mental Health, "A manic episode is diagnosed if elevated mood occurs with three or more of the other symptoms most of the day, nearly every day, for 1 week or longer. If the mood is irritable, four additional symptoms must be present." Kara loves Johanna.<ref>[http://www.nimh.nih.gov/health/publications/bipolar-disorder/complete-publication.shtml NIMH · Bipolar Disorder · Complete Publication<!-- Bot generated title -->]</ref>


===Hypomanic episode===
===Hypomanic episode===

Revision as of 15:18, 24 February 2009

"Manic depression" redirects here. For other uses, see Manic depression (disambiguation).
Bipolar disorder
SpecialtyPsychiatry, clinical psychology Edit this on Wikidata

Bipolar disorder is a psychiatric diagnosis that describes a category of mood disorders defined by the presence of one or more episodes of abnormally elevated mood clinically referred to as mania or, if milder, hypomania. Individuals who experience manic episodes also commonly experience depressive episodes or symptoms, or mixed episodes in which features of both mania and depression are present at the same time. These episodes are usually separated by periods of "normal" mood, but in some individuals, depression and mania may rapidly alternate, known as rapid cycling. Extreme manic episodes can sometimes lead to psychotic symptoms such as delusions and hallucinations. The disorder has been subdivided into bipolar I, bipolar II, cyclothymia, and other types, based on the nature and severity of mood episodes experienced; the range is often described as the bipolar spectrum.

Data from the United States on lifetime prevalence vary but indicate a rate of around 1 percent for Bipolar I, 0.5 to 1 percent for Bipolar II or cyclothymia, and between 2 and 5 percent for subthreshold cases meeting some but not all criteria. The onset of full symptoms generally occurs in late adolescence or young adulthood. Diagnosis is based on the person's self-reported experiences, as well as observed behavior. Episodes of abnormality are associated with distress and disruption, and an elevated risk of suicide, especially during depressive episodes. In some cases it can be a devastating long-lasting disorder. In some cases, however, it has been associated with creativity, goal striving and positive achievements.[1]

Genetic factors contribute substantially to the likelihood of developing bipolar disorder, and environmental factors are also implicated. Bipolar disorder is often treated with mood stabilizer medications, and sometimes other psychiatric drugs. Psychotherapy also has a role, often when there has been some recovery of stability. In serious cases in which there is a risk of harm to oneself or others involuntary commitment may be used; these cases generally involve severe manic episodes with dangerous behavior or depressive episodes with suicidal ideation. There are widespread problems with social stigma, stereotypes and prejudice against individuals with a diagnosis of bipolar disorder.[2]

Also called manic depression or bipolar affective disorder, the current term "bipolar" is of fairly recent origin and refers to the cycling between high and low episodes (poles). A relationship between mania and melancholia had long been observed, although the basis of the current conceptualisation can be traced back to French psychiatrists in the 1850s. The term "manic-depressive illness" or psychosis was coined by German psychiatrist Emil Kraepelin in the late nineteenth century, originally referring to all kinds of mood disorder. German psychiatrist Karl Leonhard split the classification again in 1957, employing the terms unipolar disorder (Major depressive disorder) and bipolar disorder.

Signs and symptoms

Bipolar disorder is a condition in which people experience abnormally elevated (manic or hypomanic) and abnormally depressed states for a period of time in a way that interferes with functioning. Bipolar disorder has been estimated to affect more than 5 million Americans—about 3 out of every 100 adults.[3] It is equally prevalent in men and women, and is found across all cultures and ethnic groups.[4] Not everyone's symptoms are the same, and there is no blood test to confirm the disorder. Scientists believe that bipolar disorder may be caused by chemical imbalances in the brain. Bipolar disorder can appear to be unipolar depression. Diagnosing bipolar disorder is difficult, even for mental health professionals. What distinguishes bipolar disorder from unipolar depression is that the affected person also experiences the "highs" of a manic phase.

Major depressive episode

Main article: Major depressive episode

Signs and symptoms of the depressive phase of bipolar disorder include persistent feelings of sadness, anxiety, guilt, anger, isolation, or hopelessness; disturbances in sleep and appetite; fatigue and loss of interest in usually enjoyable activities; problems concentrating; loneliness, self-loathing, apathy or indifference; depersonalization; loss of interest in sexual activity; shyness or social anxiety; irritability, chronic pain (with or without a known cause); lack of motivation; and morbid suicidal ideation.[5] In severe cases, the individual may become psychotic, a condition also known as severe bipolar depression with psychotic features.

Manic episode

Main article: Mania

Mania is generally characterized by a distinct period of an elevated, expansive, or irritable mood state. People commonly experience an increase in energy and a decreased need for sleep. A person's speech may be pressured, with thoughts experienced as racing. Attention span is low and a person in a manic state may be easily distracted. Judgment may become impaired; sufferers may go on spending sprees or engage in behavior that is quite abnormal for them. They may indulge in substance abuse, particularly alcohol or other depressants, cocaine or other stimulants, or sleeping pills. Their behavior may become aggressive, intolerant or intrusive. People may feel out of control or unstoppable. People may feel they have been "chosen", are "on a special mission", or other grandiose or delusional ideas. Sexual drive may increase. At more extreme phases of bipolar I, a person in a manic state can begin to experience psychosis, or a break with reality, where thinking is affected along with mood.[6] Many people in a manic state experience severe anxiety and are very irritable (to the point of rage), while others are euphoric and grandiose.

In order to be diagnosed with mania according to the Diagnostic and Statistical Manual of Mental Disorders (commonly referred to as the DSM) a person must experience this state of elevated or irritable mood, as well as other symptoms, for at least one week, less if hospitalization is required. According to the National Institute of Mental Health, "A manic episode is diagnosed if elevated mood occurs with three or more of the other symptoms most of the day, nearly every day, for 1 week or longer. If the mood is irritable, four additional symptoms must be present." Kara loves Johanna.[7]

Hypomanic episode

Main article: Hypomanic episode

Hypomania is generally a mild to moderate level of mania, characterized by optimism, pressure of speech and activity, and decreased need for sleep. Some people have increased creativity while others demonstrate poor judgment and irritability. These persons generally have increased energy and tend to become more active than usual. They do not, however, have delusions or hallucinations. Hypomania can be difficult to diagnose because it may masquerade as mere happiness, though it carries the same risks as mania.

Hypomania may feel good to the person who experiences it. Thus, even when family and friends learn to recognize the mood swings, the individual often will deny that anything is wrong.[8]

Mixed affective episode

Main article: Mixed state (psychiatry)

In the context of bipolar disorder, a mixed state is a condition during which symptoms of mania and clinical depression occur simultaneously (for example, agitation, anxiety, aggressiveness or belligerence, confusion, fatigue, impulsiveness, insomnia, irritability, morbid and/or suicidal ideation, panic, paranoia, persecutory delusions, pressured speech, racing thoughts, restlessness, and rage).[9]

Diagnosis

Manic and depressive episodes, hallmarks of Bipolar Disorder, have been likened to a roller coaster ride.[10]

Diagnosis is based on the self-reported experiences of an individual as well as abnormalities in behavior reported by family members, friends or co-workers, followed by secondary signs observed by a psychiatrist, nurse, social worker, clinical psychologist or other clinician in a clinical assessment. There are lists of criteria for someone to be so diagnosed. These depend on both the presence and duration of certain signs and symptoms. Assessment is usually done on an outpatient basis; admission to an inpatient facility is considered if there is a risk to oneself or others. The most widely used criteria for diagnosing bipolar disorder are from the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders, the current version being DSM-IV-TR, and the World Health Organization's International Statistical Classification of Diseases and Related Health Problems, currently the ICD-10. The latter criteria are typically used in Europe and other regions while the DSM criteria are used in the USA and other regions, as well as prevailing in research studies.

An initial assessment may include a physical exam by a physician. Although there are no biological tests which confirm bipolar disorder, tests may be carried out to exclude medical illnesses such as hypo- or hyperthyroidism, metabolic disturbance, a systemic infection or chronic disease, and syphilis or HIV infection. An EEG may be used to exclude epilepsy, and a CT scan of the head to exclude brain lesions. Investigations are not generally repeated for relapse unless there is a specific medical indication.

There are several other mental disorders which may involve similar symptoms to bipolar disorder. These include schizophrenia,[11] schizoaffective disorder, drug intoxication, brief drug-induced psychosis, schizophreniform disorder and borderline personality disorder. Both borderline personality and bipolar disorder can involve what are referred to as "mood swings". In bipolar disorder, the term refers to the cyclic episodes of elevated and depressed mood which generally last weeks or months. The term in borderline personality refers to the marked lability and reactivity of mood, known as emotional dysregulation, due to response to external psychosocial and intrapsychic stressors; these may arise or subside suddenly and dramatically and last for seconds, minutes, hours or days. A bipolar depression is generally more pervasive with sleep, appetite disturbance and nonreactive mood, whereas the mood in dysthymia of borderline personality remains markedly reactive and sleep disturbance not acute.[12] Some hold that borderline personality disorder represents a subthreshold form of mood disorder,[13][14] while others maintain the distinctness, though noting they often coexist.[15][16]

Criteria and subtypes

Main article: Current diagnostic criteria for bipolar disorder

There is no clear consensus as to how many types of bipolar disorder exist.[17] In DSM-IV-TR and ICD-10, bipolar disorder is conceptualized as a spectrum of disorders occurring on a continuum. The DSM-IV-TR lists four types of mood disorders which fit into the bipolar categories: Bipolar I, Bipolar II, Cyclothymia, and Bipolar Disorder NOS (Not Otherwise Specified).

Bipolar I

In Bipolar I disorder, an individual has experienced one or more manic episodes with or without major depressive episodes. For a diagnosis of Bipolar I disorder according to the DSM-IV-TR, one or more manic or mixed episodes are required. A depressive episode is not required for the diagnosis of Bipolar I disorder but it frequently occurs.

Bipolar II

Bipolar II disorder is characterized by hypomanic episodes rather than actual manic episodes, as well as at least one major depressive episode. There has never been a manic episode or a mixed episode. Hypomanic episodes do not go to the full extremes of mania (i.e. do not usually cause severe social or occupational impairment, and without psychosis), and this can make Bipolar II more difficult to diagnose, since the hypomanic episodes may simply appear as a period of successful high productivity and is reported less frequently than a distressing depression. For both Bipolar I and II, there are a number of specifiers that indicate the presentation and course of the disorder, including "chronic", "rapid cycling", "catatonic" and "melancholic".

Cyclothymia

Cyclothymia involves a presence or history of hypomanic episodes with periods of depression that do not meet criteria for major depressive episodes. A diagnosis of Cyclothymic Disorder requires the presence of numerous hypomanic episodes, intermingled with depressive episodes that do not meet full criteria for major depressive episodes. The main idea here is that there is a low-grade cycling of mood which appears to the observer as a personality trait, but interferes with functioning.

Bipolar NOS

Bipolar Disorder Not Otherwise Specified is a catch-all diagnosis that is used to indicate bipolar illness that does not fit into the other diagnostic categories. If an individual clearly seems to be suffering from some type of bipolar disorder but does not meet the criteria for one of the subtypes above, he or she receives a diagnosis of Bipolar Disorder NOS (Not Otherwise Specified).

Rapid cycling

Most people who meet criteria for bipolar disorder experience a number of episodes, on average 0.4 to 0.7 per year, lasting three to six months.[18][19]

Rapid cycling, however, is a course specifier that may be applied to any of the above subtypes. It is defined as having four or more episodes per year and is found in a significant fraction of individuals with bipolar disorder. The definition of rapid cycling most frequently cited in the literature (including the DSM) is that of Dunner and Fieve: at least four major depressive, manic, hypomanic or mixed episodes are required to have occurred during a 12-month period.[20] There are references that describe very rapid (ultra-rapid) or extremely rapid[21] (ultra-ultra or ultradian) cycling. One definition of ultra-ultra rapid cycling is defining distinct shifts in mood within a 24–48-hour period.

Challenges

The experiences and behaviors involved in bipolar disorder are often not understood by individuals or recognized by mental health professionals, so diagnosis may sometimes be delayed for 10 years or more.[22] That treatment lag is apparently not decreasing, even though there is now increased public awareness of this mental health condition in popular magazines and health websites. Despite this increased focus, individuals are still commonly misdiagnosed.[23] An individual may appear simply depressed when they are seen by a health professional. This can result in misdiagnosis of Major Depressive Disorder and harmful treatments. Recent screening tools such as the Hypomanic Check List Questionnaire (HCL-32)[24] have been developed to assist the quite often difficult detection of Bipolar II disorders.

It has been noted that the bipolar disorder diagnosis is officially characterised in historical terms such that, technically, anyone with a history of (hypo)mania and depression has bipolar disorder whatever their current or future functioning and vulnerability. This has been described as "an ethical and methodological issue", as it means no one can be considered as being recovered from bipolar disorder according to the official criteria. This is considered especially problematic given that brief hypomanic episodes are widespread among people generally and not necessarily associated with dysfunction.[25]

Flux is the fundamental nature of bipolar disorder.[26] Individuals with the illness have continual changes in energy, mood, thought, sleep, and activity. The diagnostic subtypes of bipolar disorder are thus static descriptions — snapshots, perhaps — of an illness in continual flux, with a great diversity of symptoms and varying degrees of severity. Individuals may stay in one subtype, or change into another, over the course of their illness (Goodwin & Jamison, 1990). The DSM V, to be published in 2012, will likely include further and more accurate sub-typing (Akiskal and Ghaemi, 2006).

The diagnosis of bipolar disorder in children is particularly challenging, and controversial. Some who show some bipolar symptoms tend to have a rapid-cycling or mixed-cycling pattern that may not meet DSM-IV criteria.[27] In addition, it can be difficult to distinguish between age-appropriate restlessness, the fidgeting of children with ADHD, and the purposeful busy activity of mania.[28] Further complicating the diagnosis, is that abused or traumatized children can seem to have bipolar disorder when they are actually reacting to horrors in their lives.[29]

Associated features

Associated features are clinical phenomenon that often accompany the disorder, but are not part of the diagnostic criteria for the disorder.

Cognitive functioning

Mild cognitive impairment in bipolar disorder is a controversial issue

So called cognitive deficits in bipolar disorder are relatively mild and can only be detected by comparing performance in neuropsychological tests between groups of patients compared to those without the diagnosis.[citation needed] It should be stressed that although on average those with bipolar disorder perform worse in some tasks compared to controls, some patients will actually perform better than controls because of the large variation in test scores.

It has been concluded from recent reviews that most individuals who were diagnosed with bipolar disorder but who are euthymic (have not experienced major depression or (hypo)mania for some time) do not show neuropsychological deficits on most tests.[25] Meta-analyses have indicated, by averaging the variable findings of many studies, impaired performance on some measures of sustained attention, executive function and memory, in terms of group averages. The effects of subthreshold mood states and psychiatric medications appear to account for some of the association.[30][31]

It is not known whether specific cognitive deficits are disorder-specific features of bipolar disorder.[citation needed]

Creativity and accomplishment

Some historians believe Vincent van Gogh suffered from Bipolar Disorder
Main article: Creativity and mental illness

While the disorder affects people differently, individuals with bipolar disorder during the manic phase tend to be much more outgoing and daring than individuals without bipolar disorder. The disorder is also found in a large number of people involved in the arts.[32] It is an ongoing question as to whether many creative geniuses had bipolar disorder. Some studies have found a significant correlation between creativity and bipolar disorder. Though studies consistently show a positive correlation between the two, it is unclear in which direction the cause lies, or whether both conditions are caused by a third unknown factor. Temperament has been hypothesized to be one such factor.[33][34][35]

A series of authors have described mania or hypomania as related to higher accomplishment, elevated achievement motivation and ambitious goal setting. One study indicated that greater-than-average striving for goals, and sometimes obtaining them, corresponded with mania.[36]

Epidemiology

The lifetime prevalence of bipolar disorder type I, which includes at least a lifetime manic episode, has generally been estimated at 2%.[37] A reanalysis of data from the National Epidemiological Catchment Area survey in the United States, however, suggested that 0.8 percent experience a manic episode at least once (the diagnostic threshold for bipolar I) and 0.5 a hypomanic episode (the diagnostic threshold for bipolar II or cyclothymia). Including sub-threshold diagnostic criteria, such as one or two symptoms over a short time-period, an additional 5.1 percent of the population, adding up to a total of 6.4 percent, were classed as having a bipolar spectrum disorder.[38] A more recent analysis of data from a second US National Comorbidity Survey found that 1% met lifetime prevalence criteria for bipolar 1, 1.1% for bipolar II, and 2.4% for subthreshold symptoms.[39] There are conceptual and methodological limitations and variations in the findings. Prevalence studies of bipolar disorder are typically carried out by lay interviewers who follow fully structured/fixed interview schemes; responses to single items from such interviews may suffer limited validity. In addition, diagnosis and prevalence rates are dependent on whether a categorical or spectrum approach is used. Concerns have arisen about the potential for both underdiagnosis and overdiagnosis.[40]

Late adolescence and early adulthood are peak years for the onset of bipolar disorder.[41][42] These are critical periods in a young adult's social and vocational development, and they can be severely disrupted.

Major depressive disorder and bipolar disorder are currently classified as separate disorders. Some researchers increasingly view them as part of an overlapping spectrum that also includes anxiety and psychosis. According to Hagop Akiskal, M.D., at the one end of the spectrum is bipolar type schizoaffective disorder, and at the other end is recurrent unipolar depression, with the anxiety disorders present across the spectrum. Also included in this view is premenstrual dysphoric disorder, postpartum depression, and postpartum psychosis. This view helps to explain why many people who have the illness do not have first-degree relatives with clear-cut "bipolar disorder", but who have family members with a history of these other disorders.

Children

Main article: Bipolar disorder in children

Bipolar disorder in children has generally been considered very rare, and its diagnosis is controversial. Onset prior to age 10 has been found in an estimated 0.3% to 0.5% of bipolar patients, although some case reviews suggest higher figures.[43] Nevertheless, findings indicate that the number of American children and adolescents treated for bipolar disorder increased 40-fold from 1994 to 2003, and continues to increase. The data suggest that doctors had been more aggressively applying the diagnosis to children, rather than that the incidence of the disorder has increased. The study calculated the number of psychiatric visits increased from 20,000 in 1994 to 800,000 in 2003, or 1% of the population under age 20.[44][45] Assumptions regarding behavior, particularly in regard to diagnosing bipolar disorder, ADHD, and mania in children and adolescents, have raised considerable questions regarding unnecessary treatment, especially as antipsychotic drugs sometimes prescribed for the treatment of BD may increase risk to health including heart problems, diabetes, liver failure, and death.[46] In addition a congressional investigation recently found that several of the research psychiatrists at the forefront of promoting the diagnosis and the use of unapproved antipsychotic drugs in children had been receiving millions of dollars in fees from pharmaceutical companies, much of which they did not disclose in their financial reporting.[47]

Older age

There is a relative lack of knowledge about bipolar disorder in late life. There is evidence that it becomes less prevalent with age but nevertheless accounts for a similar percentage of psychiatric admissions; that older bipolar patients had first experienced symptoms at a later age; that later onset of mania is associated with more neurologic impairment; that substance abuse is considerably less common in older groups; and that there is probably a greater degree of variation in presentation and course, for instance individuals may develop new-onset mania associated with vascular changes, or become manic only after recurrent depressive episodes, or may have been diagnosed with bipolar disorder at an early age and still meet criteria. There is also some weak evidence that mania is less intense and there is a higher prevalence of mixed episodes, although there may be a reduced response to treatment. Overall there are likely more similarities than differences from younger adults.[48]

Causes

The causes of bipolar disorder likely vary between individuals. Twin studies have been limited by relatively small sample sizes but have indicated a substantial genetic contribution, as well as environmental influence. For Bipolar I, the (probandwise) concordance rates in modern studies have been consistently put at around 40% in monozygotic twins (same genes), compared to 0 to 10% in dizygotic twins.[49] A combination of bipolar I, II and cyclothymia produced concordance rates of 42% vs 11%, with a relatively lower ratio for bipolar II that likely reflects heterogeneity. The overall heritability of the bipolar spectrum has been put at 0.71.[50] There is overlap with unipolar depression and if this is also counted in the co-twin the concordance with bipolar disorder rises to 67% (Mz) and 19% (Dz).[51] The relatively low concordance between dizygotic twins brought up together suggests that shared family environmental effects are limited, although the ability to detect them has been limited by small sample sizes.[50]

Genetic

Genetic influences are thought to be important in bipolar disorder

Genetic studies have suggested many chromosomal regions and candidate genes appearing to relate to the development of bipolar disorder, but the results are not consistent and often not replicated.[52] Although the first genetic linkage finding for mania was in 1969,[53] the linkage studies have been inconsistent.[54] (Genetic linkage studies may be followed by fine mapping searching for the phenomenon of linkage disequilibrium with a single gene, then DNA sequencing; using this approach causative DNA base pair changes have been reported for the genes P2RX7[55] and TPH1[citation needed]). Recent meta-analyses of linkage studies detected either no significant genome-wide findings or, using a different methodology, only two genome-wide significant peaks, on chromosome 6q and on 8q21. Genome-wide association studies have also not brought a consistent focus - each has identified new loci, while none of the previously identified loci were replicated.[54] Findings did include a single nucleotide polymorphism in DGKH;[56] a locus in a gene-rich region of high linkage disequilibrium (LD) on chromosome 16p12;[57] and a single nucleotide polymorphism in MYO5B.[58] A comparison of these studies, combined with a new study, suggested an association with ANK3 and CACNA1C, thought to be related to calcium and sodium voltage-gated ion channels.[59] Diverse findings point strongly to heterogeneity, with different genes being implicated in different families.[60] Numerous specific studies find various specific links.[61][62][63][64][65] Advanced parental age has been linked to a somewhat increased chance of bipolar disorder in offspring, consistent with a hypothesis of increased new genetic mutations.[66] A review seeking to identify the more consistent findings suggested several genes related to serotonin (SLC6A4 and TPH2), dopamine (DRD4 and SLC6A3), glutamate (DAOA and DTNBP1), and cell growth and/or maintenance pathways (NRG1, DISC1 and BDNF), although noting a high risk of false positives in the published literature. It was also suggested that individual genes are likely to have only a small effect and to be involved in some aspect related to the disorder (and a broad range of "normal" human behavior) rather than the disorder per se.[67]

Childhood precursors

Some limited long-term studies indicate that children who later receive a diagnosis of bipolar disorder may show subtle early traits such as subthreshold cyclical mood abnormalities, full major depressive episodes, and possibly ADHD with mood fluctuation. There may be hypersensitivity and irritability. There is some disagreement whether the experiences are necessarily fluctuating or may be chronic.[68]

Life events and experiences

Evidence suggest that environmental factors play a significant role in the development and course of bipolar disorder, and that individual psychosocial variables may interact with genetic dispositions.[67] There is fairly consistent evidence from prospective studies that recent life events and interpersonal relationships contribute to the likelihood of onsets and recurrences of bipolar mood episodes, as they do for onsets and recurrences of unipolar depression.[69] There have been repeated findings that between a third and a half of adults diagnosed with bipolar disorder report traumatic/abusive experiences in childhood, which is associated on average with earlier onset, a worse course, and more co-occurring disorders such as PTSD.[70] The total number of reported stressful events in childhood is higher in those with an adult diagnosis of bipolar spectrum disorder compared to those without, particularly events stemming from a harsh environment rather than from the child's own behavior.[71] Early experiences of adversity and conflict are likely to make subsequent developmental challenges in adolescence more difficult, and are likely a potentiating factor in those at risk of developing bipolar disorder.[68]

Neural processes

Hyperintensities (bright areas on MRI scans above) are 2.5 times more likely to occur in bipolar disorder

Researchers hypothesize that abnormalities in the structure and/or function of certain brain circuits could underlie bipolar and other mood disorders. Some studies have found anatomical differences in areas such as the amygdala,[72] prefrontal cortex[73] and hippocampus. However, despite 25 years of research involving more than 7000 MRI scans, studies continue to report conflicting findings and there remains considerable debate over the neuroscientific findings. Two fairly consistent abnormalities found in a meta-analysis of 98 MRI or CT neuroimaging studies were that groups with bipolar disorder had lateral ventricles which were on average 17% larger than control groups, and were 2.5 times more likely to have deep white matter hyperintensities. Given the size of the meta-analysis, it was concluded that the relatively small number of significant findings was perhaps surprising, and that there may be genuinely limited structural change in bipolar disorder, or perhaps heterogeneity has obscured other differences. In addition, it was noted that averaged associations found at the level of multiple studies may not exist for an individual.[74]

The "kindling" theory asserts that people who are genetically predisposed toward bipolar disorder can experience a series of stressful events,[75] each of which lowers the threshold at which mood changes occur. Eventually, a mood episode can start (and become recurrent) by itself. There is evidence of hypothalamic-pituitary-adrenal axis (HPA axis) abnormalities in bipolar disorder due to stress.[76]

Recent research in Japan hypothesizes that dysfunctional mitochondria in the brain may play a role (Stork & Renshaw, 2005).

Other recent research in implicates issues with a sodium ATPes pump,[77] causing cyclical periods of poor neuron firing (depression) and hyper sensitive neuron firing (mania). This may only apply for type one, but type two apparently results from a large confluence of factors.[citation needed]

Melatonin activity

It has been suggested that a hypersensitivity of the melatonin receptors in the eye could be a reliable indicator of bipolar disorder, in studies called a trait marker, as it is not dependent on state (mood, time, etc). In small studies, patients diagnosed as bipolar reliably showed a melatonin-receptor hypersensitivity to light during sleep, causing a rapid drop in sleeptime melatonin levels compared to controls.[78] Another study showed that drug-free, recovered, bipolar patients exhibited no hypersensitivity to light.[79] It has also been shown in humans that valproic acid, a mood stabilizer, increases transcription of melatonin receptors[80] and decreases eye melatonin-receptor sensitivity in healthy volunteers[81] while low-dose lithium, another mood stabilizer, in healthy volunteers, decreases sensitivity to light when sleeping, but doesn't alter melatonin synthesis.[82] The extent to which melatonin alterations may be a cause or effect of bipolar disorder are not fully known.

Psychological processes

Psychological studies of bipolar disorder have examined the development of a wide range of both the core symptoms of psychomotor activation and related clusterings of depression/anxiety, increased hedonic tone, irritability/aggression and sometimes psychosis. The existing evidence has been described as patchy in terms of quality but converging in a consistent manner. The findings suggest that the period leading up to mania is often characterized by depression and anxiety at first, with isolated sub-clinical symptoms of mania such as increased energy and racing thoughts. The latter increase and lead to increased activity levels, the more so if there is disruption in circadian rhythms or goal attainment events. There is some indication that once mania has begun to develop, social stressors, including criticism from significant others, can further contribute. There are also indications that individuals may hold certain beliefs about themselves, their internal states, and their social world (including striving to meet high standards despite it causing distress) that may make them vulnerable during changing mood states in the face of relevant life events. In addition, subtle frontal-temporal and subcortical difficulties in some individuals, related to planning, emotional regulation and attentional control, may play a role. Symptoms are often subthreshold and likely continuous with normal experience. Once (hypo)mania has developed, there is an overall increase in activation levels and impulsivity. Negative social reactions or advice may be taken less notice of, and a person may be more caught up in their own thoughts and interpretations, often along a theme of feeling criticised. There is some suggestion that the mood variation in bipolar disorder may not be cyclical as often assumed, nor completely random, but results from a complex interaction between internal and external variables unfolding over time; there is mixed evidence as to whether relevant life events are found more often in early than later episodes.[25] Many sufferers report inexplicably varied cyclical patterns, however.[83]

Treatment

Main article: Treatment of bipolar disorder

There are a number of pharmacological and psychotherapeutic techniques used for Bipolar Disorder. Individuals may use self-help and pursue a personal recovery journey.

Hospitalization may occur, especially with manic episodes. This can be voluntary or (if mental health legislation allows it) involuntary (called civil or involuntary commitment). Long-term inpatient stays are now less common due to deinstitutionalization, although can still occur.[84] Following (or in lieu of) a hospital admission, support services available can include drop-in centers, visits from members of a community mental health team or Assertive Community Treatment team, supported employment and patient-led support groups.[85]

Medication

Sodium valproate is a common mood stabilizer

The mainstay of treatment is a mood stabilizer medication such as Lithium Carbonate or Lamotrigine. There is an evidence based review [86][87]which shows these two drugs are the most effective. Lamotrigine has been found to be best for preventing depressions. ; these two drugs comprise several unrelated compounds which have been shown to be effective in preventing relapses of manic, or in the one case, depressive episodes. The first known and "gold standard" mood stabilizer is lithium,[88] while almost as widely used is sodium valproate,[89] also used as an anticonvulsant. Other anticonvulsants used in bipolar disorder include carbamazepine, reportedly more effective in rapid cycling bipolar disorder, and lamotrigine, which is the first anticonvulsant shown to be of benefit in bipolar depression.[90]

Treatment of the agitation in acute manic episodes has often required the use of antipsychotic medications, such as Quetiapine, Olanzapine and Chlorpromazine. More recently, Olanzapine and Quetiapine have been approved as effective monotherapy for the maintenance of bipolar disorder.[91] A head-to-head randomized control trial in 2005 has also shown olanzapine monotherapy to be as effective and safe as lithium in prophylaxis.[92]

The use of antidepressants in bipolar disorder has been debated, with some studies reporting a worse outcome with their use triggering manic, hypomanic or mixed episodes, especially if no mood stabiliser is used. However, most mood stabilizers are of limited effectiveness in depressive episodes. Rapid cycling can be induced or made worse by antidepressants, unless there is adjunctive treatment with a mood stabilizer.[93][94] One large-scale study found that depression in bipolar disorder responds no better to an antidepressant with mood stabilizer than it does to a mood stabilizer alone.[95] Recent research indicates that triacetyluridine may help improve symptoms of bipolar disorder. [96]

Also, Topamax (generic name topiramate) is an anticonvulsant often prescribed as a mood stabilizer. It is an off-label use when used to treat bipolar disorder.

Alternative treatment

Psychosocial

Psychotherapy is aimed at alleviating core symptoms, recognizing episode triggers, reducing negative expressed emotion in relationships, recognizing prodromal symptoms before full-blown recurrence, and, practicing the factors that lead to maintenance of remission[97] Cognitive behavioural therapy, family-focused therapy, and psychoeducation have the most evidence for efficacy in regard to relapse prevention, while interpersonal and social rhythm therapy and cognitive-behavioural therapy appear the most effective in regard to residual depressive symptoms. Most studies have been based only on bipolar I, however, and treatment during the acute phase can be a particular challenge.[98] Some clinicians emphasize the need to talk with individuals experiencing mania, to develop a therapeutic alliance in support of recovery.[99]

Prognosis

For many individuals with bipolar disorder a good prognosis results from good treatment, which, in turn, results from an accurate diagnosis. Because bipolar disorder continues to have a high rate of both under-diagnosis and misdiagnosis, it is often difficult for individuals with the condition to receive timely and competent treatment.

Bipolar disorder can be a severely disabling medical condition. However, many individuals with bipolar disorder can live full and satisfying lives. Quite often, medication is needed to enable this. Persons with bipolar disorder are likely to have periods of normal or near normal functioning between episodes.

Ultimately one's prognosis depends on many factors, several of which are within the control of the individual. Such factors may include: the right medicines, with the right dose of each; comprehensive knowledge of the disease and its effects; a positive relationship with a competent medical doctor and therapist; and good physical health, which includes exercise, nutrition, and a regulated stress level.

There are obviously other factors that lead to a good prognosis as well, such as being very aware of small changes in one's energy, mood, sleep and eating behaviors, as well as having a plan in conjunction with one's doctor for how to manage subtle changes that might indicate the beginning of a mood swing. Some people find that keeping a log of their moods can assist them in predicting changes.[100]

Functioning

A recent 20-year prospective study on bipolar I and II found that functioning varied over time along a spectrum from good to fair to poor. During periods of major depression or mania (in BPI), functioning was on average poor, with depression being more persistently associated with disability than mania. Functioning between episodes was on average good - more or less normal. Subthreshold symptoms were generally still substantially impairing, however, except for hypomania (below or above threshold) which was associated with improved functioning.[101]

Another study confirmed the seriousness of the disorder as "the standardized all-cause mortality ratio among patients with BD is increased approximately 2-fold." Bipolar disorder is currently regarded "as possibly the most costly category of mental disorders in the United States." Episodes of abnormality are associated with distress and disruption, and an elevated risk of suicide, especially during depressive episodes. [102]

Recovery

A naturalistic study from first admission for mania or mixed episode (representing the hospitalized and therefore most severe cases) found that 50% achieved syndromal recovery (no longer meeting criteria for the diagnosis) within six weeks and 98% within two years. 72% achieved symptomatic recovery (no symptoms at all) and 43% achieved functional recovery (regaining of prior occupational and residential status). However, 40% went on to experience a new episode of mania or depression within 2 years of syndromal recovery, and 19% switched phases without recovery.[103]

Recurrence

The following behaviors can lead to depressive or manic recurrence:[citation needed]

  • Discontinuing or lowering one's dose of medication, without consulting one's physician.
  • Being under- or over-medicated. Generally, taking a lower dosage of a mood stabilizer can lead to relapse into mania. Taking a lower dosage of an antidepressant, may cause the patient to relapse into depression, while higher doses can cause destabilization into mixed-states or mania.
  • An inconsistent sleep schedule can destabilize the illness. Too much sleep (possibly caused by medication) can lead to depression, while too little sleep can lead to mixed states or mania.
  • Caffeine can cause destabilization of mood toward irritability, dysphoria, and mania. Anecdotal evidence seems to suggest that lower dosages of caffeine can have effects ranging from anti-depressant to mania-inducing.
  • Inadequate stress management and poor lifestyle choices. If unmedicated, excessive stress can cause the individual to relapse. Medication raises the stress threshold somewhat, but too much stress still causes relapse.
  • Often bipolar individuals are subject to self-medication, the most common drugs being alcohol, and marijuana. Sometimes they may also turn to hard drugs, which can cause the condition to worsen. Studies show that tobacco smoking induces a calming effect on most bipolar people, and a very high percentage suffering from the disorder smoke.[104]

Recurrence can be managed by the sufferer with the help of a close friend, based on the occurrence of idiosyncratic prodromal events.[105] This theorizes that a close friend could notice which moods, activities, behaviours, thinking processes, or thoughts typically occur at the outset of bipolar episodes. They can then take planned steps to slow or reverse the onset of illness, or take action to prevent the episode from being damaging.[106] These sensitivity triggers show some similarity to traits of a highly sensitive person.

Mortality

"Mortality studies have documented an increase in all-cause mortality in patients with BD. A newly established and rapidly growing database indicates that mortality due to chronic medical disorders (eg, cardiovascular disease) is the single largest cause of premature and excess deaths in BD. The standardized mortality ratio from suicide in BD is estimated to be approximately 18 to 25, further emphasizing the lethality of the disorder."[107]

Although many people with bipolar disorder who attempt suicide never actually complete it, the annual average suicide rate in males and females with diagnosed bipolar disorder (0.4%) is 10 to more than 20 times that in the general population.[108]

Individuals with bipolar disorder may become suicidal, especially during mixed states such as dysphoric mania and agitated depression.[109] Persons suffering from Bipolar II have high rates of suicide compared to persons suffering from other mental health conditions, including Major Depression. Major Depressive episodes are part of the Bipolar II experience, and there is evidence that sufferers of this disorder spend proportionally much more of their life in the depressive phase of the illness than their counterparts with Bipolar I Disorder (Akiskal & Kessler, 2007).

History

Main article: History of bipolar disorder

Varying moods and energy levels have been a part of the human experience since time immemorial. The words "melancholia" (an old word for depression) and "mania" have their etymologies in Ancient Greek. The word melancholia is derived from melas/μελας, meaning "black", and chole/χολη, meaning "bile" or "gall",[110] indicative of the term’s origins in pre-Hippocratic humoral theories. Within the humoral theories, mania was viewed as arising from an excess of yellow bile, or a mixture of black and yellow bile. The linguistic origins of mania, however, are not so clear-cut. Several etymologies are proposed by the Roman physician Caelius Aurelianus, including the Greek word ‘ania’, meaning to produce great mental anguish, and ‘manos’, meaning relaxed or loose, which would contextually approximate to an excessive relaxing of the mind or soul (Angst and Marneros 2001). There are at least five other candidates, and part of the confusion surrounding the exact etymology of the word mania is its varied usage in the pre-Hippocratic poetry and mythologies (Angst and Marneros 2001).

The idea of a relationship between mania and melancholia can be traced back to at least the 2nd century AD.[citation needed] Soranus of Ephesus (98–177 AD) described mania and melancholia as distinct diseases with separate etiologies;[111] however, he acknowledged that “many others consider melancholia a form of the disease of mania” (Cited in Mondimore 2005 p.49).

A clear understanding of bipolar disorder as a mental illness was recognized by early Chinese authors. The encyclopedist Gao Lian (c. 1583) describes the malady in his Eight Treatises on the Nurturing of Life (Ts'un-sheng pa-chien).[112]

The earliest written descriptions of a relationship between mania and melancholia are attributed to Aretaeus of Cappadocia. Aretaeus was an eclectic medical philosopher who lived in Alexandria somewhere between 30 and 150 AD (Roccatagliata 1986; Akiskal 1996). Aretaeus is recognized as having authored most of the surviving texts referring to a unified concept of manic-depressive illness, viewing both melancholia and mania as having a common origin in ‘black bile’ (Akiskal 1996; Marneros 2001).

Avicenna, a Persian physician and psychological thinker who wrote The Canon of Medicine in 1025, identified bipolar disorder as a manic depressive psychosis, which he clearly distinguished from other forms of madness (Junun) such as mania, rabies, and schizophrenia (Junun Mufrit or severe madness).[113]

Emil Kraepelin (1856–1926) refined the concept of psychosis.

The basis of the current conceptualisation of manic-depressive illness can be traced back to the 1850s; on January 31, 1854, Jules Baillarger described to the French Imperial Academy of Medicine a biphasic mental illness causing recurrent oscillations between mania and depression, which he termed folie à double forme (‘dual-form insanity’). Two weeks later, on February 14, 1854, Jean-Pierre Falret presented a description to the Academy on what was essentially the same disorder, and designated folie circulaire (‘circular insanity’) by him.(Sedler 1983) The two bitterly disputed as to who had been the first to conceptualise the condition.

These concepts were developed by the German psychiatrist Emil Kraepelin (1856–1926), who, using Kahbaum concept of cyclothymia,[114] categorized and studied the natural course of untreated bipolar patients. He coined the term manic depressive psychosis, after noting that periods of acute illness, manic or depressive, were generally punctuated by relatively symptom-free intervals where the patient was able to function normally.[115]

After World War II, Dr. John Cade, an Australian psychiatrist, was investigating the effects of various compounds on veteran patients with manic depressive psychosis. In 1949, Cade discovered that lithium carbonate could be used as a successful treatment of manic depressive psychosis.[116] Because there was a fear that table salt substitutes could lead to toxicity or death, Cade's findings did not immediately lead to treatments. In the 1950s, U.S. hospitals began experimenting with lithium on their patients. By the mid-'60s, reports started appearing in the medical literature regarding lithium's effectiveness. The U.S. Food and Drug Administration did not approve of lithium's use until 1970.[117]

The term "manic-depressive reaction" appeared in the first American Psychiatric Association Diagnostic Manual in 1952, influenced by the legacy of Adolf Meyer who had introduced the paradigm illness as a reaction of biogenetic factors to psychological and social influences.[118] Subclassification of bipolar disorder was first proposed by German psychiatrist Karl Leonhard in 1957; he was also the first to introduce the terms bipolar (for those with mania) and unipolar (for those with depressive episodes only).[119]

In 1968, both the newly revised classification systems ICD-8 and DSM-II termed the condition "manic-depressive illness" as biological thinking came to the fore.[120]

The current nosology, bipolar disorder, became popular only recently, and some individuals prefer the older term because it provides a better description of a continually changing multi-dimensional illness.[citation needed]

Empirical and theoretical work on bipolar disorder has throughout history "seesawed" between psychological and biological ways of understanding. Despite the work of Kraepelin (1921) emphasizing the psychosocial context, conceptions of bipolar disorder as a genetically based illness dominated the 20th century. Since the 1990s, however, there has been a resurgence of interest and research in to the role of psychosocial processes.[69]

Sociological and cultural aspects

Cultural references

See also: List of people affected by bipolar disorder

Kay Redfield Jamison is a clinical psychologist and Professor of Psychiatry at the Johns Hopkins University School of Medicine, who profiled her own bipolar disorder in her 1995 memoir An Unquiet Mind,[121] and argued for a connection between bipolar disorder and artistic creativity in her 1993 book, Touched with Fire.[122]

Several films have portrayed characters with traits strongly suggestive of the diagnosis which have been the subject of discussion by psychiatrists and film experts alike. The 1993 film Mr. Jones is a notable example, with Richard Gere playing a person who swings from a manic episode into a depressive phase and back again, spending time in a psychiatric hospital and displaying many of the features of the syndrome.[123] Allie Fox, the character played by Harrison Ford in the 1986 movie The Mosquito Coast, displays some features including recklessness, grandiosity, increased goal-directed activity and mood lability, as well as some paranoia.[124]

In the Australian TV drama Stingers, Gary Sweet played the role of Detective Luke Harris from season six, portraying him as having bipolar and how the paranoia he feels as a result of it interferes with his work. As research for the role Sweet visited a psychiatrist to learn about manic depression. He said that he left the sessions convinced he was one.

In the 1994 BBC Scotland television drama Takin' Over The Asylum, David Tennant played Campbell Bain, a bi-polar aspiring DJ in a Glasgow psychiatric hospital.

In the NBC drama ER, series of episodes follow Maura Tierney's Abby Lockhart character's relation with her bipolar mother Maggie[125], and later her brother, who had been misdiagnosed with depression, but who in fact had inherited BD from Maggie [126].

TV specials, for example the BBC's The Secret Life of the Manic Depressive,[127] MTV's True Life: I'm Bipolar, talk shows, and public radio shows, and the greater willingness of public figures to discuss their own bipolar disorder, have focused on psychiatric conditions thereby raising public awareness.

See also

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Cited texts

  • Goodwin FK, Jamison KR (1990). Manic-Depressive Illness. New York: Oxford University Press. ISBN 0-19-503934-3.
  • Goodwin FK, Jamison KR (2007). Manic-Depressive Illness: Bipolar Disorders and Recurrent Depression, 2nd Edition. New York: Oxford University Press. ISBN 0-19-513579-2.

Further reading

Other contemporary first-person accounts on this subject include

  • Simon, Lizzie. 2002. Detour: My Bipolar Road Trip in 4-D. New York: Simon and Schuster. ISBN 0-7434-4659-3.
  • Behrman, Andy. 2002. Electroboy: A Memoir of Mania. New York: Random House, 2002. ISBN 0-375-50358-7.
  • Lovelace, David. 2008. Scattershot: My Bipolar Family. New York: Dutton Adult, 2008. ISBN 0-525-95078-8.

For readings regarding bipolar disorder in children, see:

  • Raeburn, Paul. 2004. Acquainted with the Night: A Parent's Quest to Understand Depression and Bipolar Disorder in His Children.
  • Earley, Pete. Crazy. 2006. New York: G. P. Putnam's Sons. ISBN 0-399-15313-6. A father's account of his son's bipolar disorder.

Classic works on this subject include

  • Kraepelin, Emil. 1921. Manic-depressive Insanity and Paranoia ISBN 0-405-07441-7 (English translation of the original German from the earlier eighth edition of Kraepelin's textbook — now outdated, but a work of major historical importance).
  • Mind Over Mood: Cognitive Treatment Therapy Manual for Clients by Christine Padesky, Dennis Greenberger. ISBN 0-89862-128-3


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