Affective Disorders Brian E. Wood, D.O. Department Chair, Psychiatry Edward Via Virginia College of Osteopathic Medicine Assistant Professor of Clinical Psychiatric Medicine University of Virginia, School of Medicine Mood Disorders • • • • • Major Depressive disorder Bipolar disorder Dysthymic disorder Cyclothymic disorder Mood Disorder due to secondary sources – General medical conditions – Substance use/abuse Major Depressive Episode Time Mood Manic Episode Mood Time Epidemiology • Major Depressive Disorder – Prevalence 2-3/100 men, 5-10/100 women – Lifetime expectancy 10% in men, 20% in women. – Risk increases throughout life for men, peaks in 40’s then decreases in women • Bipolar Disorder – Prevalence 1/100 in men and women – Lifetime expectancy 1% in men and women – Usually occurs in the mid 20’s and 30’s perhaps slightly later in women Epidemiology • Dysthymic Disorder – – – – Much less studied More common in females Onset frequently in 20’s to 30’s More common among first degree relatives with MDD. • Cyclothymic Disorder – Essentially occurs more frequently in the same groups and age ranges as Bipolar Disorder – More common among first degree relatives with MDD or Bipolar Disorder. Etiology • Major Depressive Disorder – – – – Heritability 10-13% in first degree relatives Mz concordance rate higher than Dz rate Increased risk in lower socioeconomic classes Increased risk with family history of ETOH, depression or early parental loss. Etiology • Bipolar Disorder – Heritability 20-25% in first degree relatives • Child with 1 Bipolar parent 25% risk • Child with both parents bipolar 50-75% risk – Slightly increased risk in higher socioeconomic groups – Mz concordance rate 40-70%, Dz concordance rate 20%. Etiology • Dysthymic Disorder – Occurs more frequently in first degree relatives with MDD but rate essentially unknown • Cyclothymic Disorder – Thought to be a less severe form of Bipolar Disoder DSM IV – TR MDD • One or more major depressive episodes for at least 2 wks. Duration • Five or more symptoms of depression (wt. Loss, insomnia or hypersomnia, psychomotor agitation or retardation, fatigue, feelings of worthlessness or innappropriate guilt, diminished concentration, recurrent thoughts of death or suicide) including either depressed mood or loss of interest or pleasure. • Rule outs for bereavement, substance induced, etc. DSM IV –TR Bipolar Disorder • One or more manic or mixed episodes usually accompanied by MDE • Manic episode characterized by at least 1 wk of elevated, expansive, or irritable mood with at least three symptoms including grandiosity, insomnia, talkativeness, flight of ideas or racing thoughts, distractibility, increased activity, excessive involvement in pleasurable activity. • Rule outs for substances, medical conditions, etc. • Occupational or social dysfunction Differential Diagnosis • MDD – Mood disorder due to general medical condition or substance induced – Manic or mixed episodes with irritable mood – Adjustment Disorder – Simple or complicated Bereavement – Dementia with prominent apathy Differential Diagnosis • Bipolar Disorder – Mood disorder due to general medical condition or substance induced – Hypomanic episode – MDE with prominent irritability – Attention Deficit/Hyperactivity Disorder Pharmacologic Treatment MDD • Pharmacologic Treatment (monotherapy) – Antidepressants • TCA’s • MAOI’s • SSRI (generally first line treatment)- steady state from 6 - 15 days. • Other antidepressants (Venlafaxine, Mirtazapine) – Psychostimulants Tricyclic Antidepressants • Primary action on NE, SE. • Also have alpha 1 blocking, histamine blocking and anticholinergic effects • AV nodal block • Lethal in overdose • Infrequently used today for treatment of depression but some resurgence in use due to tx. Resistance and off label uses (ex. Pain control) Monoamine Oxidase Inhibitors • Primary action on MAO that breaks down NE • Significant alpha 1 and histaminergic effects but little antcholinergic or AV node effects. • Risk of hypertensive crisis with Tyramine containing foods or with noradrenergic agents (ex. Pseudoephedrine) SSRI’s • Primary action at 5HT2 receptor. • Most widely prescribed psychotropic medication in use today and generally first line treatment for depression. • Generally very well tolerated with minimal incidence of side effects. • Not lethal in overdose. • Do have significant drug-drug interactions due to CP450 metabolism. Effects of SSRI’s on Cytochrome P450 Enzymes Cytochrome Polymorphism Inhibitors Potentially significant Interactions 1A2 Possible Fluvoxamine Haloperidol Phenytoin Theophylline Caffeine 2C9 Yes; 2-3%of whites; 15-20%of Asians Fluoxetine Fluvoxamine Sertraline Phenytoin Diazepam Tolbuamide 2D6 Yes; 5-8% of whites; lower in Asians and African Americans Fluoxetine Fluvoxamine Paroxetine Sertraline Citalpram TCA’s Haloperidol Perphenazine Thioridazine Clozapine Risperidone B-Blockers Type 1C antiarrhythmics 3A Possible Fluoxetine Fluvoxamine Sertraline Citalpram TCA’s Carbamazepine Alprazolam Triazolam Terfenadine Astemizole Adapted from DeVane (1994) ECT • Application of brief electrical pulse to induce controlled generalized seizure. • Mechanism of action unknown but correlates with “surge” of neurotransmitters in the CNS and changes in permeability in the blood-brain barrier. • Modern ECT applied with general anaesthesia and neuromuscular blockade. • Probably the highest efficacy of any single agent used to treat affective disorders. Other Treatments • Interpersonal psychotherapy • Cognitive-behavioral therapy • Psychodynamic psychotherapy Pharmacologic Treatment of Bipolar Disorder • Li compounds – primary effect at voltage gated Na channel of the neuron • Anticonvulsants – effect at the voltage gated Na channel and membrane stabilization effects. – Valproic acid – Carbamazepine – Other anticonvulsants Summary • Affective disorders are disorders of mood regulation and include both hyper-excitable and hypo-excitable states defined by episodes. • They are generally recurrent diseases but occasionally occur in single episodes. • They are familial with probable genetic inheritance but with significant environmental factors affecting expression. • Affective disorders are treatable diseases requiring careful evaluation, initiation of appropriate treatment, and follow up in order to improve condition, quality of life and minimize risks.