Define Affective disorders.
Mood or ‘affective’ disorders are illnesses where the main feature is excessively high or low mood
Mood disorders generally run a relapsing and remitting course
What are the types of affective disorders?
‘Unipolar’ – recurrent episodes of depression
‘Bipolar’ – episodes of mania and depression
Describe the epidemiology of depression and BPAD?1
What are the causes of affective disorder?
What is the genetic component to affective disorders?
o Combination of genes probably increases the risk of mood disorders
o Relatives of depressed people are at higher risk of depression
o Relatives of those with BPAD are at higher risk of both depression and BPAD
o there is a genetic contribution at the level of temperament, behaviour and response to stress
o Serotonin transporter gene
Promoter region has 2 alleles: S (short) and (long)
S allele suffers 3 or more life events – trebles risk of depression
No risk for those with L allele
What is the childhood and life experiences aspect fo affective disorder?
o Adverse childhood experiences are associated with depression
Impact on confidence, trust and self-esteem
Include abuse, relentless criticism, parental loss and perceived lack of affection
o Vulnerability factors
Increase risk of depression in adults by reducing resilience to adverse situations
Include unemployment, lack of a confiding relationship, lower socioeconomic status and social isolation
What is the significance of stressful life events in affective disorders?
o Life events (in order in degree of stressfulness)
Death of spouse
o These may occur in the 3 months before an episode of depression and the risk of depression increases 6-fold in the 6 months following life events
o Loss events are particularly important – include loss of role, loss of autonomy
If cannot mourn, depression may ensue
What are the organic causes of affective disorders?
• Physical Causes: Depression
o Chronic pain
o Cushing’s syndrome
o Hypothyroidism
o Stroke
o Parkinson’s
o MS
o Hyperparathyroidism
o Drugs: beta blockers, antihypertensives, illicit substances e.g. cocaine
•Physical Causes: Mania
o Cushing’s syndrome
o Head injury
o MS
o Steroids
o Antidepressants
o Stimulants
What are the Behavioural and cognitive theories behind affective disorder?
o Depressed people learn that they cannot change their situation and effectively give up trying
• Beck’s model of depression
o Informs CBT
o Shows how negative thinking can depress mood, which generates negative thoughts, resulting in a downwards spiral towards depression
o Proposed a negative triad of view on the self, the world and the future o In mania he described a positive triad
What are the psychoanalytic theories behind affective disorder?
What are the neurochemical theories behind affective disorder?
• Monoamine Hypothesis
o Depression is the result of a deficiency in brain monoamine neurotransmitters
o Noradrenaline (NA): affects mood and energy
o Serotonin (5-HT): affects sleep, appetite, memory and mood
o Dopamine (DA): affects psychomotor activity
Drugs that deplete monoamines, e.g. reserpine, can cause depresson
Most antidepressants increase 5-HT and NA levels
In depression there has been shown to be
o Decreased plasma typtophan (5-HT precursor)
o Decreased CSF levels of 5-HIAA (5-HT metabolite) in suicide victims
o Decreased CSF homovanillic acid (dopamine metabolite)
• Hypothesis does not explain the 4-6 week delay in mood elevation by antidepressants Mania may be related to dopamine overactivity
o Bromocriptine = dopamine agonist, amphetamine and cocaine increase dopamine levels and can induce manic symptoms
o Antipsychotics = dopamine receptor antagonists à used in tx of mania
What are the neuroendocrine abnormality theories behind affective disorder?
Cortisol = stress hormone
Stressful life events may damage hippocampal neurons
Dexamethasone (synthetic glucocorticoid) fails to suppress cortisol secretion in 50% of depressedpatients
Non-suppression also occurs in mania, schizophrenia and old age – therefore not diagnosticallyuseful
What are the neuroanatomical abnormality theories behind affective disorder?
Depression is associated with neuroimaging abnormalities of the left anterior cingulate cortex, but it’s unclear whether this is a cause or effect.
Deep brain stimulation targets this area, and is a potential treatment for severe, treatment- resistant depression.
What are the core symptoms of depression according to ICD-10?
What is recurrent depressive disorder?
Recurrent depressive disorder is when someone experiences at least two depressive episodes, separated by several months of wellness
What are the cognitive symptoms of depression?
What are the biological symptoms of depression?
• Altered sleep pattern
o Initial insomnia: difficulty falling asleep
o Early morning waking: 2 hours earlier than normal
o Hypersomnia (less common)
o Weight loss
o Strain on relationships
Constipation
Aches and pains
Dysmenorrhoea
What are the psychotic symptoms of depression?
o Unpleasant derogatory voices
• Visual hallucinations
o Scenes of destruction or evil spirits
• Delusions
Nihilistic: follow theme of ‘nothingness’
Persecutory
How do we grade depression?
Grading: reflects number and severity of symptoms, and effect on functioning
What is the differential diagnosis for depression?
Physical Causes Dementia
Adjustment Disorder
Normal Sadness
• Try not to medicalise – people are allowed to be sad sometimes
BPAD/Schizoaffective disorder/Schizophrenia
• Look for previous manic or psychotic features
Substance Misuse
• Alcohol/drugs can cause depression or be a form of self-medication
Postnatal depression or puerperal illness
Bereavement
• Normal grief should not be diagnosed as depression
• Grief is a normal response to loss
• Normal stages
o Numbness
o Pining
o Depression
o Recovery
**• Abnormal grief reaction** o Extremely intense (reaching the level of depression, disabling the person) o Prolonged (\>6 months) without relief o Delayed (no sign of an emotional response)
Dysthymia: chronic low mood for more days than not, lasting years, but not continuous enough to diagnose depression.
Burnout: exhaustion, disengagement, and reduced productivity in response to chronic work stress.
What are the investigations for depression?
Collateral hx
Physical examination
Blood tests
o TFT – rule out hypothyroidism
o FBC – anaemia causes fatigue
o Glu or HbA1c – diabetes causes fatigue
– Vitamin D and B12 (low levels cause fatigue).
– Calcium (hyperparathyroidism can cause depression).
• Rating scales can measure severity or monitor tx response
o Beck Depression inventory (BDI)
o Hospital Anxiety and Depression Scale (HADS)
o Patient Health Questionnaire PHQ-9
• CT or MRI head are never routine but may help to rule out suspected cerebral pathology
Cognitive assessment if suspect dementia
What is the management of mild to moderate depression?
Mild To Moderate Depression
o Sleep hygiene advice
o Arrange further assessment within 2weeks
o Low-Intensity Psychosocial Intervention
o Group CBT
o Do not routinely consider medication unless:
How should you manage Moderate to Severe Depression?
o Provide a combination of:
o Antidepressant Medication
After starting antidepressant medication, review after 2 weeks (if low suicide risk), then every 2-4 weeks thereafter for 3 months
Patients <30 years old or at increased risk of suicide should be followed-up after 1 week
Review response to treatment after 3-4 weeks
o High-Intensity Psychological Interventions
Individual CBT
16-20 sessions over 3-4 months
Consider 2 sessions per week in the first 2-3 weeks
Consider follow-up sessions over the following 3-6 months
Interpersonal Therapy
16-20 sessions over 3-4 months
Consider 2 sessions per week in the first 2-3 weeks
How long should depression treatment be given for?
Treatment should continue for 6– 9 months after recovery, to prevent relapse. In recurrent depressive disorder, treatment should continue for longer (≥2 years)