Depression and Bipolar Disorder (Final) Flashcards
Core Features of Depression
Dysphoria: Feelings of prolonged sadness.
Irritability: Excessive sensitivity, hostility, and moodiness. Unique to children and adolescents.
Anhedonia: Loss of pleasure or interest in previously enjoyable activities.
Major Depressive Disorder (MDD)
Defined by presence of a major depressive episode. Need 5 symptoms total (during the same two week period). Need at least one of the core features of depression: 1. Depressed mood, most of the day, nearly every day OR irritability (children and adolescents only), most of the day, nearly every day. 2. Anhedonia most of the day, nearly every day.
PLUS 4 of the following symptoms: weight change, insomnia, fatigue, psychomotor agitation, feelings of worthlessness, unable to concentrate or indecisiveness, recurrent thoughts of death.
Specifiers for Depressive Disorders (apply across disorders not just MDD)
- Anxious distress
- Mixed features (some manic/hypomanic symptoms that don’t meet bipolar disorder threshold)
- Melancholic features
- Atypical features
- With psychotic features - mood congruent or mood incongruent
- With catatonia
- Peripartum onset
- Seasonal pattern
*Anxious distress and atypical features are now the only specifiers relevant to persistent depressive disorder
Persistent Depressive Disorder (PDD)
Depressed or irritable mood for most of the day, more days than not, as indicated by either subjective account or by observation by others. For kids, you only need to be at this level for one year. Also have to have two or more of the symptoms: poor appetite or overeating, insomnia or hypersomnia, low energy or fatigue, low self-esteem, poor concentration, feelings of hopelessness. During the 1 year period, the person has never been without the symptoms for more than 2 months at a time.
Disruptive Mood Dysregulation Disorder (DMDD)
Characterized by severe and recurrent temper outburst manifested verbally and/or behaviourally that are out of proportion. The timber outburst are inconsistent with developmental level. They occur three or more times per week. The mood between temper outbursts is persistently irritable or angry. Symptoms are present for 12 months or more. Not diagnosed before age 6 or after age 18. Age at onset of the outburst and irritable mood is before age 10. Child has never met criteria for a manic or hypomanic episode. DMDD is ODD (DMDD is more severe) or bipolar disorder.
DMDD: Axelson et al. 2013
Examined DMDD in a large sample of 6- to 12-year-olds seeking psychiatric services. Found that DMDD was not well-differentiated from CD or ODD. No difference between youth with and without DMDD diagnosis in symptom severity or functional impairment. DMDD diagnosis showed poor stability.
DMDD: Copeland et al. 2013
Examined the DMDD criteria in three large community samples. Three month prevalence rates for meeting criteria for disruptive mood dysregulation disorder ranged from 0.8% to 3.3% with the highest rate in preschoolers. Highest levels of co-occurrence were with depressive disorders and oppositional defiant disorder.
Depression Diagnoses: Categorical vs dimensional
Many children and adolescents will have subclinical depression. They will not quite make diagnostic criteria, but they have a significant number of symptoms. Show significant impairment (e.g. academic, social). At greater risk for going on to develop depression as well as other disorders and difficulties (e.g. substance use). Just because you’re not meeting the full criteria doesn’t mean you’re not having impairment in certain parts of your life.
Epidemiology of MDD: Lifetime Prevalence
1% of preschool-aged children (3- to 5-years-of-age). 2% of elementary school-aged children (5- to 12-years-of-age). 11% of adolescents (13- to 18-years-of-age). Prevalence increases across adolescence.
An Aside on Preschool Depression
Earlier onset generally associated with higher risk for more severe & chronic of depression later on.
An Aside on Preschool Depression: Luby et al (2014)
Study of around 250 preschoolers followed through school age. Preschool depression = 2.7x more likely to be depressed at school age. Also higher rates of anxiety and ADHD.
An Aside on Preschool Depression: Gaffrey et al (2011)
2-week MDE duration criterion not as relevant for preschoolers. MDD in preschool associated with MDD 2 years later regardless of whether MDE duration criterion met at baseline if other symptoms were present.
An Aside on Preschool Depression: Gaffrey at al (2013)
Depressed 4-6 year olds show altered brain activity (e.g., + amygdala activity) when viewing emotional faces vs non-depressed kids (also see this in adults).
Epidemiology of MDD: Racial/ethnic differences
Tend to see slight differences, not huge. Latin youth more likely than White youth to meet diagnostic criteria for a mood disorder. Also other evidence than Black youth experience greater levels of mood disorders than White youth. White you more likely than both Latin and Black youth to have received treatment for a mood disorder. Usuals suspects for differences: overrepresentation in low SES groups, discrimination (interpersonal, systemic, cultural), etc.
Epidemiology of MDD: Gender differences
Lack of differences in depression pre-puberty - become pronounced in adolescence. Girls become much more likely to have clinical levels of depression than boys throughout adolescence. No on explanation of why this happens.
Epidemiology of MDD: Possible Explanations for Gender Gap
- Girls are more likely to seek help
–> NCS-A: No gender difference in use of services for depression.
–> Gender difference found in community samples
–> Not super conclusive - Biological factors
–> Onset of elevated rates of depression in girls coincides with puberty.
–> More mature pubertal status is linked to depression in girls, but not boys, and is a stronger predictor than age.
–> Early onset puberty is a risk factor for depression.
–> Puberty may sensitize girls to stress. - a) Stress
–> Puberty may create stressors for girls (changes in physical appearance and sex-role identification)
–> In general, robust link between stress and depression - b) Interpersonal Stress
–> Conflict with friends, rejection by peers
–> Girls are more likely to generate interpersonal stress than are boys
–> Stronger association between interpersonal stress and depression for girls than for boys
–> Girls are more invested in interpersonal relationships - Cognition
–> Depression is associated with attributions about stressful life events that are likely to amplify negative affect.
–> This cognitive bias appears comparable across girls and boys - Coping
–> Girls are more likely to cope by ruminating, either alone or with a friend
Biological Factors of Depression
Children of depressed parents are more likely to be depressed. Children with a parent who was depressed as a child are 14x more likely to become depressed before age 13. Why:
Heritability: Twin studies suggest heritability rates between 35% and 75%.
Stress reactivity: Early exposure to stress which may sensitize person to later stress.
Stress Reactivity: Hypothalamic-Pituitary-Adrenal (HPA) axis
Hormonal response to stress, can measure it looking at cortisol.
Stress Reactivity: Prenatal depression
Depression in moms associated with increased levels of cortisol: may affect fetus. Number of months a women is depressed during pregnancy predicts elevated levels of cortisol when children are 6-7 years of age. Elevated cortisol associated with internalizing problems.
Stress Reactivity Postnatal (postpartum) depression
Biological: Potential exposure through breastmilk?
Behavioural: Infants develop rapidly, early experiences with caregivers may have profound influence. If you get sensitized to stress it impacts how you systems will respond to later stress. Maternal depression is associated with parenting behaviours that may be problematic for children’s development. Because infants can’t regulate their own stress they relay on their parents to Renault it for them - May contribute to dysregulation of stress responses.
Social-Cognitive Processing
Studies that explicitly ask about interpretations of negative scenarios. Depression is associated with a tendency to select negative interpretations. Kids higher in depression tend to identity fewer assertive strategies.
Assertiveness vs agressiveness
Assertiveness: Saying what you want
Aggressiveness: Getting what you want potentially at the cost of other people.
Social-Cognitive Processing: Interpretation
Interpretation bias or response bias? - Just picking the most negative option available.
Interpretation that is accessible to verbal response: give the more negative interpretation when you are asked directly. Interpretation occurring outside of conscious awareness.
Social-Cognitive Processing: Interpretation (Dearing & Gotlib, 2009)
Interested in whether daughters of mothers who had depression showed interpretation biases. Used two different interpretation tasks.
Task 1: Blend two words together acoustically. Neutral-negative (e.g. Cry-dry). Neutral-positive (e.g. Joy-boy). Result is an ambiguous word (should hear each 50/50 odds). At-risk girls showed preference for negative words if depression-related (not threat-related negative words like hate). Control showed preference for positive word in neutral-positive pairings.