Exam 2 Flashcards
(276 cards)
unipolar depressive disorders
major depressive disorder, persistent depressive disorder, premenstrual dysphoric disorder, disruptive mood dysregulation disorder
bipolar disorders
bipolar I disorder, bipolar II disorder, cyclothymia
DSM-5 criteria for major depressive disorder
- sad mood OR loss of interest and pleasure (i.e., anhedonia)
- at least 5 symptoms in total, including other symptoms such as: sleeping too much or too little; psychomotor retardation or agitation; poor appetite and weight loss or increased appetite and weight gain; loss of energy; feelings of worthlessness or excessive guilt; difficulty concentration, thinking, or making decisions; recurrent thoughts of death or suicide
major depressive disorder (MDD)
episodic; recurrent; patients may present with quite varied symptom presentations; useful to consider depression symptoms as a continuum of severity
over ____ different symptom combinations are possible for MDD
1,000
age of onset for MDD
symptoms are present: nearly every day, most of the day, for at least 2 weeks
DSM-5 criteria for persistent depressive disorder (PDD)
- depressed mood for at least 2 years (1 year for children/adolescents)
- plus 2 other symptoms: poor appetite or overeating; sleeping too much or too little; low energy; poor self-esteem; trouble concentrating or making decisions; feelings of hopelessness
- not as severe of a form of depression as MDD
- symptoms do not clear for more than 2 months at a time
- no symptoms of mania
age of onset for PDD
- depressed mood for at least 2 years
- depressed mood for at least 1 year for children/adolescents
epidemiology of depression
- 16.2% lifetime prevalence of MDD
- 5% of people with depression experience it for more than 2 years
- twice as common in women as in men
- three times as common among people in poverty
- prevalence and symptoms vary across cultures
age of onset of depression
early 20s; average age of onset has decreased over past 50 years
comorbidity of depression
- 5-30% with MDD also experience PDD
- 60% of those with MDD will also meet criteria for anxiety disorder at some point
defining feature of each type of bipolar disorder
severity and duration of mania
mania
state of intense elation, irritability, or activation
hypomania
symptoms of mania but less intense; does not involve significant impairment
depressive episode required for bipolar __ but not bipolar __
II; I
DSM-5 criteria for manic and hypomanic episodes
- distinctly elevated or irritable mood
- abnormally increased activity and energy
- plus three other symptoms (4 if mood is irritable): increased goal-directed activity or psychomotor agitation; talkativeness, rapid speech; flight of ideas or racing thoughts; decreased need for sleep; increased self-esteem or grandiosity; distractibility, attention easily diverted; excessive involvement in activities that are likely to have undesirable consequences (e.g., reckless spending/sexual behavior/driving)
- symptoms are present most of the day, nearly every day
DSM-5 criteria for a manic episode
- symptoms last at least 1 week, require hospitalization, or include psychosis
- symptoms cause significant distress or functional impairment
DSM-5 criteria for a hypomanic episode
- symptoms last at least 4 days
- clear changes in functioning that are observable to others, but impairment is not marked
- no psychotic symptoms are present
DSM-5 criteria for cyclothymia
- milder, chronic form of bipolar disorder
- symptoms last at least 2 years in adults; 1 year in children/adolescents
- numerous periods with hypomanic and depressive symptoms but does not meet criteria for hypomania or major depressive episode
- symptoms do not clear for more than 2 months at a time
age of onset of cyclothymia
- symptoms last at least 2 years in adults and 1 year in children/adolescents
- periods with hypomanic or major depressive episode symptoms do not clear for more than 2 months at a time
epidemiology of bipolar disorders
- prevalence rate lower than MDD
- 1% in US, 0.6% worldwide for bipolar I
0.4%-2% for bipolar II
4% for cyclothymia - average age of onset in 20s
- no gender differences in rates
etiology of mood disorders - genetic influences
- heritability estimates (% of disorder caused by genetic factors): 37% MDD, 80% bipolar disorder
- unlikely one gene explains these illnesses; more likely gene x environment interaction
- serotonin transporter gene (5-HHT) polymorphism
etiology of mood disorders - neurotransmitters
- norepinephrine, dopamine, serotonin, GABA
- some findings suggest neurotransmitters may relate more to specific symptoms rather to MDD diagnostic status
- new models focus on sensitivity of postsynaptic receptors
etiology of mood disorders - neural regions involved in emotion and reward processing
- oversensitivity to emotional stimuli –> elevated amygdala
- interference with emotion regulation –> elevated anterior cingulate, diminished prefrontal cortex and hippocampus
- motivation to pursue rewards (striatum)
- disruptions in the connectivity of these regions