Diagnostic Requirements #

Essential Features: #

• A history of at least one Hypomanic Episode and at least one Depressive Episode (see Essential Features for Mood Episodes). The typical course of the disorder is characterized by recurrent Depressive and Hypomanic Episodes.
• There is no history of Manic or Mixed Episodes.

Type of current Mood Episode, severity and psychotic symptoms in current Depressive Episodes, and remission specifiers: #

The type of current Mood Episode, the severity and presence or absence of psychotic symptoms in current Depressive Episodes, and the degree of remission should be described in Bipolar Type II Disorder. (See descriptions of psychotic symptoms and Depressive Episode Severity in Mood Episode descriptions above.) Available categories are as follows:

• 6A61.0 Bipolar Type II Disorder, Current Episode Hypomanic双相II型障碍，目前为轻躁狂发作
• 6A61.1 Bipolar Type II Disorder, Current Episode Depressive, Mild双相II型障碍，目前为轻度抑郁发作
• 6A61.2 Bipolar Type II Disorder, Current Episode Depressive, Moderate, without psychotic symptoms双相II型障碍，目前为不伴精神病性症状的中度抑郁发作
• 6A61.3 Bipolar Type II Disorder, Current Episode Depressive, Moderate, with psychotic symptoms双相II型障碍，目前为伴精神病性症状的中度抑郁发作
• 6A61.4 Bipolar Type II Disorder, Current Episode Depressive, Severe, without psychotic symptoms双相II型障碍，目前为不伴精神病性症状的重度抑郁发作
• 6A61.5 Bipolar Type II Disorder, Current Episode Depressive, Severe, with psychotic symptoms双相II型障碍，目前为伴精神病性症状的重度抑郁发作
• 6A61.6 Bipolar Type II Disorder, Current Episode Depressive, Unspecified Severity双相II型障碍，目前为未特指严重程度的抑郁发作
• 6A61.7 Bipolar Type II Disorder, currently in partial remission, most recent episode Hypomanic双相II型障碍，目前为部分缓解，最近为轻躁狂发作
• 6A61.8 Bipolar Type II Disorder, currently in partial remission, most recent episode Depressive双相II型障碍，目前为部分缓解，最近为抑郁发作
• 6A61.9 Bipolar Type II Disorder, currently in partial remission, most recent episode unspecified双相II型障碍，目前为部分缓解，最近为未特指发作
• 6A61.A Bipolar Type II Disorder, currently in full remission双相II型障碍，目前为完全缓解
• 6A61.Y Other specified bipolar type II disorder其他特指的双相II型障碍
• 6A61.Z Bipolar type II disorder, unspecified未特指的双相II型障碍

6A61.0 Bipolar type II disorder, current episode hypomanic双相II型障碍，目前为轻躁狂发作 #

Description描述

Bipolar type II disorder, current episode hypomanic is diagnosed when the definitional requirements for Bipolar type II disorder have been met and the current episode is hypomanic. A hypomanic episode is a persistent mood state lasting at least several days characterised by mild elevation of mood or increased irritability and increased activity or a subjective experience of increased energy, accompanied by other characteristic symptoms such as rapid speech, rapid or racing thoughts, increased self-esteem, an increase in sexual drive or sociability, decreased need for sleep, distractibility, or impulsive or reckless behaviour. The symptoms are not severe enough to cause marked impairment in occupational functioning or in usual social activities or relationships with others, does not necessitate hospitalization, and there are no accompanying delusions or hallucinations.当符合双相II型障碍的定义要求，并且当前发作为轻躁狂发作时，则诊断为双相II型障碍，当前轻躁狂发作。低躁狂发作是一种至少持续数天的持续性情绪状态，其特征是情绪轻度升高或易怒、活动增加或主观感觉精力充沛，并伴有其他特征性症状，如话语增多、思绪奔涌，自尊心增强、性欲或社交能力的增加，睡眠需求减少、注意力分散，以及冲动或鲁莽行为。症状不严重，不足以造成职业功能或日常社会活动或与他人关系的明显损害，不需要住院治疗，也没有伴随的妄想或幻觉。

Postcoordination后组配

Symptomatic and Course Presentation Specifiers for Mood Episodes: #

Additional specifiers may be applied to describe a current mood episode in the context of Bipolar Type II Disorder (Depressive or Hypomanic Episodes). These specifiers indicate other important features of the clinical presentation or of the course, onset, and pattern of Mood Episodes. These specifiers are not mutually exclusive, and as many may be added as apply. (Note that these same specifiers, with the exception of Rapid Cycling, may also be applied to current Depressive Episodes in the context of Depressive Disorders. The specifier Rapid Cycling is specific to Bipolar Type I and Bipolar Type II Disorders.)

Available specifiers are as follows:

with prominent anxiety symptoms (6A80.0) #

• This specifier can be applied if, in the context of a current Depressive, Manic, Mixed, or Hypomanic Episode, prominent and clinically significant anxiety symptoms (e.g., feeling nervous, anxious or on edge, not being able to control worrying thoughts, fear that something awful will happen, having trouble relaxing, muscle tension, autonomic symptoms) have been present for most of the time during the episode. If there have been panic attacks during the current Depressive or Mixed Episode, these should be recorded separately (see ‘with panic attacks’ specifier). This specifier may be used whether or not the diagnostic requirements for an Anxiety or Fear-Related Disorder are also met, in which case the Anxiety or Fear-Related Disorder should also be diagnosed.

with panic attacks (6A80.1) #

• This specifier can be applied if, in the context of a current Episode, there have been panic attacks during the past month that occur specifically in response to depressive ruminations or other anxiety-provoking cognitions. If panic attacks occur exclusively in response to such thoughts, the ‘with panic attacks’ specifier should be applied rather than an additional co-occurring diagnosis of Panic Disorder. If some panic attacks over the course of the Depressive or Mixed Episode have been unexpected and not exclusively in response to depressive or anxiety-provoking thoughts and the full diagnostic requirements for Panic Disorder are met, a separate diagnosis of Panic Disorder should be assigned.

current Depressive Episode persistent (6A80.2) #

• This specifier can be applied if the diagnostic requirements for Depressive Episode are currently met and have been met continuously for at least the past 2 years.

current Depressive Episode with melancholia (6A80.3) #

• This specifier can be applied if, in the context of a current Depressive Episode, several of the following symptoms have been present during the worst period of the current episode:
  • Loss of interest or pleasure in most activities that are normally enjoyable to the individual (i.e., pervasive anhedonia).
  • Lack of emotional reactivity to normally pleasurable stimuli or circumstances (i.e., mood does not lift even transiently with exposure).
  • Terminal insomnia (i.e., waking in the morning 2 hours or more before the usual time).
  • Depressive symptoms are worse in the morning.
  • Marked psychomotor retardation or agitation.
  • Marked loss of appetite or loss of weight.

with seasonal pattern (6A80.4) #

• This specifier can be applied to or Bipolar Type II Disorder if there has been a regular seasonal pattern of onset and remission of at least one type of episode (i.e., Depressive, Manic, Mixed, or Hypomanic Episodes). The other types of Mood Episodes may not follow this pattern.
• A substantial majority of the relevant Mood Episodes should correspond with the seasonal pattern.
• A seasonal pattern should be differentiated from an episode that is coincidental with a particular season but predominantly related to a psychological stressor that regularly occurs at that time of the year (e.g., seasonal unemployment).

with rapid cycling (6A80.5) #

• This specifier can be applied if or Bipolar Type II Disorder is characterized by a high frequency of Mood Episodes (at least four) over the past 12 months. There may be a switch from one polarity of mood to the other, or the Mood Episodes may be demarcated by a period of remission.
• In individuals with a high frequency of Mood Episodes, some may have a shorter duration than those usually observed in Bipolar Type II Disorder. In particular, depressive periods may only last several days. However, if depressive and manic symptoms alternate very rapidly (i.e., from day to day or within the same day), a Mixed Episode should be diagnosed rather than rapid cycling.

In the context of Bipolar Type II Disorder, Mood Episodes that occur during pregnancy or commencing within about 6 weeks after delivery (referred to as the puerperium) can be identified using one of the following two additional diagnostic codes, depending on whether delusions, hallucinations, or other psychotic symptoms are present. These diagnoses should be assigned in addition to the relevant Bipolar Disorder diagnosis.

Mental or behavioural disorders associated with pregnancy, childbirth or the puerperium, without psychotic symptoms (6E20) #

• This additional diagnostic code should be used for Mood Episodes that arise during pregnancy or commencing within about 6 weeks after delivery that do not include delusions, hallucinations, or other psychotic symptoms. This designation should not be used to describe mild and transient depressive symptoms that do not meet the diagnostic requirements for a depressive episode, which may occur soon after delivery (so-called postpartum blues).

Mental or behavioural disorders associated with pregnancy, childbirth or the puerperium, with psychotic symptoms (6E21) #

• This additional diagnostic code should be used for Mood Episodes that arise during pregnancy or commencing within about 6 weeks after delivery that include delusions, hallucinations, or other psychotic symptoms. This designation should not be used to describe mild and transient depressive symptoms that do not meet the diagnostic requirements for a depressive episode, which may occur soon after delivery (so-called postpartum blues).

Note: For the following sections, see also material under Depressive Episode, Manic Episode, Mixed Episode and Hypomanic Episode. Material on Additional Clinical Features, Boundary with Normality (Threshold), Developmental Presentations, and Boundary with Other Disorders and Conditions (Differential Diagnosis) that relates specifically to the Mood Episodes is contained in these sections, whereas material focusing on Bipolar Type II Disorder overall appears below.

Additional Clinical Features: #

• In combination with a history of one or more Depressive Episodes, a Hypomanic Episode arising during antidepressant treatment (e.g., medication, electroconvulsive therapy, light therapy, transcranial magnetic stimulation) is grounds for a diagnosis of Bipolar Type II Disorder if the syndrome persists after the treatment is discontinued and the full diagnostic requirements of the Mood Episode are met after the direct physiological effects of the treatment are likely to have receded.
• Inter-episode periods may be characterized by complete remission of symptoms or by the presence of residual hypomanic, manic, mixed, or depressive symptoms, in which case the ‘partial remission’ specifier should be applied.
• Suicide risk is significantly higher among individuals diagnosed with Bipolar Type II Disorder than among the general population, particularly during Depressive Episodes and among individuals with rapid cycling.
• Recurrent panic attacks in Bipolar Type II Disorder may be indicative of greater severity, poorer response to treatment, and greater risk for suicide.
• Family history is an important factor to consider because heritability of Bipolar Disorders is the highest of all mental disorders.
• When individuals with Bipolar Type II Disorder seek clinical services, they almost invariably do so during Depressive Episodes. Given that individuals experiencing a Hypomanic Episode often have a subjective experience of improved functioning (e.g., greater productivity and creativity at work), they rarely seek clinical care during such episodes. Thus, Hypomanic Episodes usually must be assessed retrospectively in individuals presenting with depressive symptoms.
• Individuals initially diagnosed with Bipolar Type II Disorder are at high risk of experiencing a Manic or Mixed Episode during their lifetime. If this occurs, the diagnosis should be changed to Bipolar Type I Disorder.
• Patients diagnosed with Bipolar Type II Disorder are at elevated risk for developing a variety of medical conditions affecting the cardiovascular system (e.g., hypertension) and metabolism (e.g., hyperglycemia), some of which may be due to the effects of the chronic use of medications used to treat Bipolar Disorders.
• Individuals with Bipolar Type II Disorder exhibit high rates of co-occurring Mental, Behavioural or Neurodevelopmental Disorders, most commonly Anxiety or Fear-Related Disorders and Disorders Due to Substance Use.

Boundary with Normality (Threshold): #

• The presence or history of Hypomanic Episodes in the absence of a history of at least one Depressive Episode is not a sufficient basis for a presumptive diagnosis of Bipolar Type II Disorder.

Course Features: #

• Bipolar Type II Disorder has its onset most often during the mid-twenties; however, onset during late adolescence and throughout early and mid-adulthood may also occur. Initial onset of Bipolar Type II Disorder in older adults is rare.
• While onset typically begins following a single Depressive Episode, some individuals experience several Depressive Episodes before occurrence of a Hypomanic Episode.
• The presence of chronic and gradually worsening experiences of affective lability or mood swings, particularly during adolescence and early adulthood, has been associated with an increased risk of developing Bipolar Type II Disorder.
• Up to 15% of individuals with Bipolar Type II Disorder will subsequently develop a Manic Episode resulting in a change of diagnosis to Bipolar Type I Disorder.
• Spontaneous intra-episode shifts from a Depressive Episode to Hypomanic Episode are not uncommon.
• Risk of recurrence increases with each subsequent Mood Episode.

Culture-Related Features: #

• Studies indicate that the prevalence of Bipolar or Related Disorders varies across cultural, ethnic, and migrant groups, partly as a function of social stress. Symptom expression may also vary and be shaped by common cultural idioms, cultural histories or personal histories that are prominent in identity formation and expressed as grandiose ideas or beliefs. For example, grandiosity may be expressed in culturally specific ways such that a Muslim individual experiencing a Manic Episode may believe he is Muhammad, whereas a Christian individual may believe he is Jesus. Individuals from the person’s cultural group may be helpful in distinguishing normative expressions of belief or ritual from manic or psychotic experiences and behaviours.
• In some cultural contexts, mood changes are more readily expressed in the form of bodily symptoms (e.g., pain, fatigue, weakness) rather than directly reported as psychological symptoms.
• Some types of symptoms may be considered more shameful or severe according to cultural norms, leading to reporting biases. For example, some cultures may emphasize shame more than guilt, whereas in others suicidal behaviour and thinking may be prohibited. In some cultural groups, features such as sadness and lack of productivity may be perceived as signs of personal weakness and therefore under-reported.
• The cultural salience of depressive symptoms may vary across social groups as a result of varying cultural ‘scripts’ for the disorder which make specific types of symptoms more prominent, for example: psychological (e.g., sadness, emotional numbness, rumination), moral (e.g., guilt, worthlessness), social/interpersonal (e.g., lack of productivity, conflictive relationships), hedonic (e.g., decreased pleasure), spiritual (e.g., dreams of dead relatives), or somatic symptoms (e.g., insomnia, pain, fatigue, dizziness).

Sex- and/or Gender-Related Features: #

• Women are more likely to experience Hypomanic Episodes and rapid cycling. The time of greatest risk for a Hypomanic Episode is during the early postpartum period following childbirth. A specifier of ‘Current Episode Perinatal’ should be assigned under these circumstances. Approximately half of those who experience postpartum hypomanic symptoms will later develop a Depressive Disorder. Differentiating between normal experiences of mood and sleep disturbances typically associated with caring for a newborn and symptoms of Bipolar Type II disorder is challenging.

Boundaries with Other Disorders and Conditions (Differential Diagnosis): #

• Boundary with Cyclothymic Disorder: In Cyclothymic Disorder, the number, severity and/or duration of depressive symptoms have never met the threshold required for a Depressive Episode and there is no evidence of a history of Mixed or Manic Episodes.
• Boundary with Attention Deficit Hyperactivity Disorder: Although a Hypomanic Episode may include symptoms characteristic of Attention Deficit Hyperactivity Disorder such as distractibility, hyperactivity, and impulsivity, Bipolar Type II Disorder are differentiated from Attention Deficit Hyperactivity Disorder by their episodic nature and the accompanying elevated, euphoric or irritable mood. However, Attention Deficit Hyperactivity Disorder and Bipolar Type II Disorder can co-occur. When they do, Attention Deficit Hyperactivity Disorder symptoms tend to worsen during Hypomanic Episodes.
• Boundary with Schizophrenia or Other Primary Psychotic Disorders: The presentation is not better accounted for by a diagnosis of Schizophrenia or Other Primary Psychotic Disorder. Individuals with Bipolar Type II Disorder can exhibit psychotic symptoms during Depressive Episodes, but these symptoms occur only during Mood Episodes. Conversely, individuals with a diagnosis of Schizophrenia or Other Primary Psychotic Disorder may experience significant depressive or manic symptoms during psychotic episodes. In such cases, if the symptoms do not meet the diagnostic requirements for a Depressive Episode, their presence and severity in the context of a psychotic disorder diagnosis can be denoted by applying specifier scales from ‘Symptomatic Manifestations of Primary Psychotic Disorders’, i.e., ‘with depressive symptoms in primary psychotic disorders.’ If all diagnostic requirements for both a Depressive Episode and Schizophrenia are met concurrently or within a few days of each other and other diagnostic requirements are met, the diagnosis of Schizoaffective Disorder should be assigned rather than Bipolar Type II Disorder. A Hypomanic Episode superimposed on Schizophrenia does not qualify for a diagnosis of Schizoaffective Disorder. However, a diagnosis of Bipolar Type II Disorder can co-occur with a diagnosis of Schizophrenia or Other Primary Psychotic Disorder, and both diagnoses may be assigned if the full diagnostic requirements for both disorders are met and psychotic symptoms are present outside of Mood Episodes.
• Boundary with Anxiety or Fear-Related Disorders: Symptoms of anxiety, including panic attacks, are common in Bipolar Type II Disorder, and in some individuals may be a prominent aspect of the clinical presentation. In such cases, the specifier ‘with prominent anxiety symptoms’ should be applied to the diagnosis for non-panic anxiety systems. If the anxiety symptoms meet the diagnostic requirements for an Anxiety or Fear-Related Disorder, the appropriate diagnosis from the Anxiety or Fear-Related Disorders grouping should also be assigned. For panic attacks, if these occur entirely in the context of anxiety associated with Depressive or Hypomanic Episodes in Bipolar Type II Disorder, they are appropriately designated using the ‘with panic attacks’ specifier. However, if panic attacks also occur outside of symptomatic Mood Episodes and other diagnostic requirements are met, a separate diagnosis of Panic Disorder should be considered. Both specifiers may be assigned if warranted.
• Boundary with Personality Disorder: Individuals with a Personality Disorder may exhibit impulsivity or mood instability, but Personality Disorder does not include Depressive or Hypomanic Episodes. However, co-occurrence of Personality Disorder and Bipolar Type II Disorder is relatively common. Symptoms of Personality Disorder should be assessed outside the context of a Mood Episode to avoid conflating symptoms of a Mood Episode with personality traits, but both diagnoses may be assigned if the diagnostic requirements for both diagnoses are fulfilled.
• Boundary with Oppositional Defiant Disorder: It is common, particularly among children and adolescents, for patterns of noncompliance and symptoms of irritability/anger to arise as part of a Mood Disorder. For example, noncompliance may be a result of depressive symptoms (e.g., diminished interest or pleasure in activities, difficulty concentrating, hopelessness, psychomotor retardation, reduced energy). During Hypomanic episodes, individuals are less likely to follow rules and comply with directions. Oppositional Defiant Disorder often co-occurs with Mood Disorders, and irritability/anger can be a common symptom across these disorders. When the behaviour problems occur primarily in the context of Hypomanic or Depressive Episodes, a separate diagnosis of Oppositional Defiant Disorder should not be assigned. However, both diagnoses may be given if the full diagnostic requirements for both disorders are met and the behaviour problems associated with Oppositional Defiant Disorder are observed outside the occurrence of a Mood Episode. The Oppositional Defiant Disorder specifier ‘with chronic irritability-anger’ may be used if appropriate.
• Boundary with Substance-induced Mood Disorder: A Depressive or Hypomanic syndrome due to the effects of a substance or medication other than antidepressant medication on the central nervous system (e.g., cocaine, amphetamines), including withdrawal effects, should be diagnosed as Substance-Induced Mood Disorder rather than Bipolar Type II Disorder. The presence of continuing mood disturbance should be assessed once the physiological effects of the relevant substance subside.
• Boundary with other Mental Disorders: Irritability is a symptom that is also observed in other disorders (e.g., Depressive Disorders, Generalized Anxiety Disorder). In order to attribute this symptom to a Hypomanic Episode, the clinician should establish the episodicity of the symptom and its co-occurrence with other symptoms consistent with a Hypomanic Episode.
• Boundary with Secondary Mood Syndrome: A Depressive or Hypomanic syndrome that is a manifestation of another medical condition should be diagnosed as Secondary Mood Syndrome rather than Bipolar Type II Disorder.