Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
PATHOPHARMACOLOGY OF THOUGHT, MOOD AND ANXIETY DISORDERS WANDA LOVITZ, APRN LEARNING OUTCOMES: THOUGHT, MOOD AND ANXIETY Upon completing this presentation, the student should be able to: Define neurotransmitter. Explain how neurotransmitters work. Identify the relationship of neurotransmitter imbalance and various mental illnesses. Describe the indications, MOA, and common and serious side effect of selected medications from the classifications of drugs used to treat thought and mood disorders: Antidepressants Barbiturates Benzodiazepines Hypnotics Antipsychotics DRUGS TO KNOW ANTIDEPRESSANTS ANXIOLYTICS BARBITURATES/NON-BENZOS First Generation Benzodiazepines Luminal/phenobarbital – *Tofranil/imipramine -TCA Elavil/amitriptyline *Valium/diazepam - TCA antiseizure Nembutal/pentobarbital – Nardil/phenelzine - MAOI Ativan/lorazepam Second Generation Xanax/alprazolam Dalmane/flurazapam – *Prozac/fluoxetine -SSRI Versed/ midazolam sedative/hypnotic Romazicon/flumazenil - Ambien/zolpidem - ANTIDOTE sedative/hypnotic Zoloft/sertraline-SSRI Lexapro/escitapram -SSRI Cymbalta/duloxetine -SNRI * = Prototype sedative/sedative/hypnotic DRUGS TO KNOW MOOD STABILIZERS/ MOOD STABILIZERS ANTIPSYCOTICS ANTISEIZURE Lithobid/lithium Haldol/haloperidol Depakote/valproic acid Neurontin/gabapentin – Thorazine/chlorpromazine Tgegretol/carbamazepine adjuvant tx Olanzapine/Zyprexa Lamitctal/lamotrigine Risperdal/risperidone Seroquel/quetiapine NEUROTRANSMITTER • A substance released when axon terminal of PREsynaptic neuron is EXCITED • acts by INHIBITING or EXCITING a target cell • Disorders of NEUROTRANSMITTERS • Too MUCH or too LITTLE Neurological and mental illnesses • Pharmacologic treatment of mental illness derived from this basic premise FOUR STEPS OF NEUROTRANSMITTER TRANSMISSION: 1. Synthesis of a transmitter substance 2. Storage/release of the transmitter@ PREsynapse 3. Binding of the transmitter to receptors on POSTsynaptic membrane 4. Removal of the transmitter from the synaptic cleft (Summarized in handout) 1= Synthesize 2=Storage & release @ presynapse 3=Binding @ postsynapse 4= Reuptake & Deactivation: removal and degradation 1 2 4 2 3 4 Neurotransmission 2 Deactivation of Neurotransmission: 1. Reuptake into presynaptic terminal 2. Enzymatic degradation 1 Neurotransmission MAJOR NEUROTRANSMITTERS IMPLICATED IN MENTAL ILLNESS • Dopamine (also impt in Parkinson’s) • Norepinephrine • Serotonin (5-HT) hydroxytryptamine • GABA gamma aminobutyric acid (Also addressed in handout) EFFECT OF NEUROTRANSMITTERS DEPRESSION ANTIDEPRESSANTS • Used to treat: • Major depression • Anxiety conditions • • • • • GAD OCD Panic Social phobia PTSD PHARMACOLOGICAL TREATMENT OF DEPRESSION AND ANXIETY Benzodiazipines Depression/Anxiety Antidepressants Selective Serotonin Reuptake Inhibitors (SSRIs & SNRIs) Monamine Oxidase Inhbitors (MAOIs) Tricylic Antidepressants Atypical Antidepressants Antidepressants (TCAs) MOOD DISORDERS: PHARMACOLOGIC TREATMENT Depression First Generation ANTIDEPRESSANTS 1. (TCA) Tricyclic antidepressants 2. (MAOI) Monoamine oxidase inhibitors Second-Generation ANTIDEPRESSANTS 1. SSRI Selective Serotonin Reuptake Inhibit 2. SNRI Serotonin Norepinephrine Reuptake Inhibitors (* 2-4 WKS) TRICYCLIC ANTIDEPRESSANTS • MOA: • Block REUPTAKE of neurotransmitters NE and serotonin (5-HT) • causing ↑ ACCUMULATION at nerve endings • Indications: • Depression, bipolar disorder ,neuropathic pain, panic disorder, OCD, chronic pain, anxiety Adverse Effects: • Anticholinergic effects (dry mouth, constipation, blurred vision, and sedation) • Sedation/orthostatic hypotension • Sexual dysfunction • Common Drugs: • amitriptyline (Elavil) • imipramine (Tofranil)* PROTOTYPE TRICYCLIC ANTIDEPRESSANTS (TCA) • Treat depression for over 40 years (1950’s) • ↑ efficacy • Less expensive than newer agents • Side effect profiles well established • annoying anticholinergic effects: dry mouth, blurred vision, urine retention and hypertension SLUG • not recommended for patients with heart problems • OVERDOSES → NOTORIOUSLY LETHAL • • NO ANTIDOTE! FYI: also given for neuropathic pain, fibromyalgia, and management of nocturnal enuresis MONOAMINE OXIDASE INHIBITORS (MAOI) • SECOND-LINE AGENTS for treatment of depression NOT responsive to other pharmacologic agents – “treatment resistive depression” • Especially useful for ATYPICAL depressions • Prototype phenelzine (Nardil) • Serious disadvantage → potential for HYPERTENSIVE CRISIS when taken WITH tyramine (an amino acid) WHAT ARE MONOAMINE OXIDASE INHIBITORS? • MOA: • INHIBIT THE ENZYME MAO • MAO widely distributed in body, particularly in nerves, liver & lung • MAO is responsible for INACTIVATING many important neurotransmitters in nervous system (particularly dopamine, epinephrine, norepinephrine & serotonin) • Inhibit MAO → then less INACTIVATION and therefore…… • ↑ NEUROTRANSMITTERS AT NERVE ENDINGS! MONOAMINE OXIDASE INHIBITORS • Adverse Effects/Interactions • CNS stimulation – anxiety, insomnia, agitation and elevated mood • Weight gain, diarrhea, orthostatic hypotension and sexual dysfunction • Seizures and liver toxicity • Drug-food interaction • Tyramine (amino acid) + MAOI = HYPERTENSIVE CRISIS! • Tyramine displaces presynaptic NOREPINEPHRINE = ↑↑↑ BP • • ↑ BP abruptly/dramatically May cause cerebral hemorrhage, stroke, coma or death WHAT FOODS CONTAIN TYRAMINE? • Tyramine-rich foods • Aged cheese (swiss, blue, cheddar) • Smoked meats (pepperoni, salami) • Yeast • Red wines • Italian broad beans SELECTIVE SEROTONIN REUPTAKE INHIBITORS (SSRIs) • NEWER classification of antidepressants (1980’s) • INDICATION: FIRST LINE ANTIDEPRRESSANT AND ANTXIOLYTIC • Some SSRIs are also used for GAD, diabetic neuropathy chronic pain, OCD, PTSD, social anxiety disorder, and premenstrual dysphoric disorder • Advantages over TCAs/MAOIs: • • LESS SEVERE/FEWER side effects (especially with elderly) Few drug-drug/drug-food interactions • Takes approx 4 weeks to reach maximum clinical effectiveness!! • Should be tapered when discontinuing to avoid withdrawal sx • Serious Drug- Drug Interaction • Do not give WITH MAOIs (possibly fatal serotonin syndrome!) SELECTIVE SEROTONIN REUPTAKE INHIBITORS Common Drugs: fluoxetine/Prozac *prototype ◦ Other commonly rx SSRIs ◦ sertraline/Zoloft ◦ citalopram/Celexa ◦ escitalapram/Lexapro ◦ MOA: inhibits serotonin reuptake SELECTIVE SEROTONIN REUPTAKE INHIBITORS • MOA: • Specific/potent INHIBITORS of presynaptic serotonin reuptake • thus ↑ levels at nerve endings • Adverse Effects: • Generally well tolerated • GI disturbances • N/V/D, constipation, dry mouth • CNS disturbances • H/A, nervousness, insomnia • Sexual dysfunction • Suicidality (esp in children), seizures • Serotonin Syndrome WHAT IS SEROTONIN SYNDROME? • A DRUG REACTION caused by body having too much serotonin accumulating in the brain stem and spinal cord • • SX: altered mental status and • • coordination • • • • • • Agitation and restlessness Hallucinations Diarrhea Diaphoresis and Fever Overactive reflexes Confusion Often occurs when 2 drugs that affect serotonin are taken together • SSRI with an MAOI Migraine meds with SSRI Treatment • • • Benzo Withdrawal of meds Drug called Periactin that blocks serotonin production INHIBITION OF REUPTAKE OF SEROTONIN SEROTONIN-NOREPINEPHRINE REUPTAKE INHIBITOR SNRI • Adverse Effects: • Cymbalta/duloxetine • MOA: prevents the reuptake of serotonin AND norepinephrine • Indications: • • • • Depression Anxiety Peripheral Neuropathy Chronic musculoskeletal pain • • Similar to the SSRIs Important to note the increased risk of SUICIDE with both SSRIs and SNRIs SUMMARY: DRUGS TO TREAT DEPRESSION TCAs and MAOIs (older drugs with more SE) SSRIs (selective SEROTONIN reuptake inhibitors) SNRIs (Serotonin-NOREPINEPHRINE reuptake inhibitors) ANXIETY DISORDERS ANXIETY DISORDERS: 5 SUBTYPES ANXIETY MAY COEXIST WITH DEPRESSION, EATING DISORDERS, AND SUBSTANCE ABUSE PANIC disorder intense feelings of immediate apprehension, terror, or impending doom Post-traumatic stress disorder (PTSD) type of extreme situational anxiety that develops in response to a previous life event Generalized ANXIETY disorder excessive anxiety lasting 6 months or more very common SOCIAL ANXIETY disorder fear of crowds Obsessive-compulsive disorder (OCD) recurrent, intrusive thought or repetitive behaviors that interfere with ANXIETY/SLEEP DISORDERS: PHARMACOLOGY Anxiolytics relieve anxiety Sedatives cause relaxation Hypnotics produce sleep Low dose – High dose = anxiolytic or hypnotic ------------------------- Sedatives Hypnotics Anxiolytics Anxiety Nervousness/ excitability without causing sleep Cause sleep Two major classes of ANXIOLYTICS:SEDATIVES/HYPNOTICS 1. BENOZODIAZEPINES 2. BARBITURATES (NON-BENZOS) BENZODIZEPINES • Indications: • treatment of anxiety and insomnia • to augment SSRI/SNRIs • do NOT affect serotonin so no risk for Serotonin Syndrome • also used to treat: • • • seizure disorder • induction agents for anesthesia ETOH withdrawal for central muscle relaxation (muscle cramps) • Commonly rx benzos: • For insomnia: • flurazepam/Dalmane • For anxiety: • • • • diazepam/Valium lorazepam/Ativan alprazolam/Xanax midazolam/Versed • also used to induce anesthesia BENZODIAZEPINES • MOA: • Bind to gammaaminobutyric acid (GABA) receptor • Intensify the effect of GABA • GABA is a natural INHIBITORY neurotransmitter found in the brain • • • • Most given orally and IV diazepam/Valium lorazepam/Ativan midazolam/Versed (IV only) • Advantage of Benzos over Barbiturates: • they do not produce life-threatening resp depression or coma (if taken in excessive amounts) • MUCH SAFER THAN BARBITURATES • antidote is available for overdoses: • flumazenil/ Romazicon BENZODIAZEPINES/BENZO LIKE DRUGS • Benzodiazepines work by enhancing response to GABA Anxiolytics • Onset of action is IMMEDIATE • Main SE are sedation, psychomotor slowing, and amnesia • Physical dependence can occur with long term use – Schedule IV drugs • Benzodiazepines can be classified as EITHER • • SEDATIVE/HYPNOTICS ANXIOLYTICS Sedatives/ Hypnotics Benzodiazepines COMMON BENZODIAZEPINES/ANXIOLYTICS Valium/ *Ativan/ diazepam lorazepam Benzos/Anxiolytics rapid relief of anxiety Xanax/ Versed/ alpraxolam midazolam –given to induce anesthesia EXAMPLES OF BENZO/BENZO-LIKE AGENTS Anxiolytics Sedative/Hypnotics *Ativan/lorazepam *Ambien/zolpidem Valium/diazepam Dalmane/flurazapam newer agent/less SE Romazicon/flumazenil is the ANTIDOTE for all of the benzodiapine and benzo like drugs Benzos/non-benzos INDICATIONS: BENZOS AND NONBENZOS Decrease anxiety –First line tx for anxiety To promote drowsiness and relaxation prior to procedures Inhibit seizure activity Promote sleep Induce anesthesia BARBITURATES • Barbiturates (also known as “nonbenzos”) are drugs derived from barbituric acid • Cause very powerful CNS depression • Prescribed for: • • SEDATIVE EFECT HYPNOTIC EFFECT • ANTI-SEIZURE EFFECT- most common indication • Not commonly prescribed today for sedation because of: • High risk of psychological and physical dependence.. several are Schedule II drugs • WITHDRAWAL FROM THESE DRUGS CAN BE SEVERE AND EVEN FATAL! • Overdose causes profound resp depression, hypotension and shock BARBITURATES FOR SLEEP: HYPNOTICS • Rarely used today d/t habit forming nature of this class of drugs tolerance/dependence • Examples of barbiturates: • pentobarbital/Nembutal – sedative • phenobarbital/ Luminal – anti-seizure OTHER AGENTS USED FOR ANXIETY AND INSOMNIA • propranolol/Inderal – a beta • blocker used for social anxiety symptoms including ‘test anxiety’ zolpidem/Ambien for insomnia • Ambien NOT chemically r/t benzos but does interact with GABA receptors • Considered a “non-benzo” • Ambien generally preserves all sleep stages with little effect on REM sleep • Should only be used for short-term tx of insomnia (7-10 days) MOOD DISORDERS MOOD DISORDERS • MAJOR (unipolar) DEPRESSION • MOST COMMON MOOD DISORDER • • • 8-20% of population Unable to experience pleasure Show loss of outside interest • Bipolar disorder (Manic-depression) • Recurrent patterns of depression & mania • cyclic episodes of energized mania and deep depression • episodes can last months or even years Bipolar is less common than unipolar • • Usually emerges in young adulthood MANIA DIAGNOSIS • Genetic component • Manic episode of at least one weeks duration that leads to hospitalization or other significant impairment • Grandiosity • Diminished need to sleep • Excessive talking or pressured speech • Increased level of goal focused activities PATHOPHYSIOLOGY OF BIPOLAR DISORDER • NOT ENTIRELY KNOWN • Genetic, neurochemical and environmental factors • Current thinking: a predominantly biological disorder d/t malfunction of neurotransmitters • Malfunctioning neurotransmitters: Serotonin, dopamaine and norepinephrine • May lie dormant and be activated spontaneously or triggered by stressors in life Mania episodes – high levels of norepinephrine cause an exhilarating high, euphoric, hypersexual, spending sprees, aggressive Depressive episodes – low levels of serotonin cause the person to experience a plummeting fall from the euphoric manic stage, sad, unable to cope Psychotic Symptoms – too much dopamine affects emotions and perceptions is linked to psychotic sx such as hallucinations PATHO OF MANIA • Poorly understood • Imaging studies show changes in brain structure • Seem to be associated with imbalance in neurotransmitters • Diagnosis: • Manic sx must be present for at least one week DRUGS TO TREAT MANIA • Mood Stabilizers *Lithium *Valproic acid • Relieve sx during manic and depressive episodes • Anti-seizure • Antidepressants SSRIs • With Bipolar, antidepressants ALWAYS combined with a mood stabilizer to avoid elevating the mood so much that a manic episode may be triggered • Antipsychotics and/or benzodiazepines Risperdal • Given to help control severe manic episodes • Ativan alone may be enough. DRUGS FOR MANIA: MOOD STABILIZERS • Mania “mood stabilizers” • Lithium salts • • Atypical Antipsychotics • • • • as monotherapy or in combination with other drugs olanzapine/Zyprexa risperdal/Risperdal* quetiapine/Seroquel Antiseizure drugs • • • sometimes used to tx mood disorders valproic acid/Depakote carbamazepine/Tegretol lamotrigine/Lamictal TREATING MANIA LITHIUM (1970) • - MOOD STABILIZERS: Norepinephrine & serotonin play role in development of mania • ( NE & serotonin = mania) • Lithium • Mainstay treatment of bipolar disorder (mania) • MOA: • • How Lithium works is still not fully understood More effective in controlling mania than depression • Alters SODIUM ion transport in nerve cells → • • ↓ NE & 5HT (serotonin) metabolism and synthesis SE: common = dazed feeling and hand tremors • polyuria (up to 3 Liters a day), excessive thirst • Imbalance in ELECTROLYTES • Acts like sodium in the body • Inhibits ADH and ability for body to concentrate urine TREATING MANIA: {LITHIUM} • MOOD STABILIZERS Lithium • NOT metabolized in liver • • 98% excreted unchanged in kidney NARROW THERAPEUTIC INDEX: • 0.5 – 1.5 meq/dl • Monitor serum levels q 1 – 3 days initially • also monitor sodium levels • Monitor q 2 – 3 months thereafter • Dehydration/excessive sweating can increase lithium toxicity • Requires one week of treatment before see results TREATING MANIA: LITHIUM MOOD STABILIZERS • Lithium - adverse effect: • ‘Lithium toxicity’ • Diarrhea** (classic early symptom) • • • • • Tremors (fine or gross) 1.5 – 2 mEq/L Slurred speech Drowsiness/somnolence 2 – 2.5 mEq/L Seizures Cardiac dysrhythmias • Death > 2.5 mEq/L DEPAKOTE/VALPROIC ACID: MOOD STABLIZER • First line treatment for bipolar manic episodes • Is an anti-seizure med • Works faster and less SE than Lithium • Known teratogen • Side Effects: • Well tolerated generally but CAN cause • • • • WEIGHT GAIN - frequent Thrombocytopenia - rare Pancreatitis -rare Liver Failure- rare THOUGHT DISORDERS (PSYCHOSIS) SCHIZOPHRENIA • 1% of world population • 30% homeless have schizophrenia • Thought disorder that involves a loss of touch with reality delusions, grandiose delusions, paranoid delusions, mood disturbances, behavior disturbances, purposeless aimless mannerisms, disorganized speech • Strong genetic predisposition • Onset typically occurs between 20 & 35 years of age SCHIZOPHRENIA: PATHOGENESIS • Not sure, several theories • Neurotransmitter alteration theory • DOPAMINE HYPOTHESIS of schizophrenia • Abnormal ↑ in dopaminergic transmission contributes to the onset of schizophrenia SCHIZOPHRENIA: A TYPE OF PSYCHOSIS • NEGATIVE SYMPTOMS ◦ SUBTRACT from the normal behavior ◦ lack of motivation/interest/drive ◦ ◦ ◦ indifferent personality Poor self care, judgement Flattened affect ◦ **sometimes mistaken for depression or laziness • POSITIVE SYMPTOMS • ADD on the normal behavior • • • • • hallucinations delusions disorganized thoughts or speech patterns Combativeness “VOICES” SCHIZOPHRENIA: PHARMACOLOGIC TREATMENT • Antipsychotics • sometimes referred to as ‘neuroleptics’ because of the NEUROLOGICAL side effects • 1. Typical • • Conventional, first-generation agents (FGA) Help with controlling the positive sx – auditory and visual hallucinations and delusions • Less effective for negative sx – emotional and social withdrawal and blunted affect 2. Atypical • • • Second-generation agents (SGA) Effective for both positive and negative symptoms Can be used to tx acute mania and bipolar depression ANTI-PSYHCOTICS: SE Thorazine Haldol chlorpramazine Haloperidol Very High EPS Low EPS Low potency FGA Risperdal risperidone High potency FGA Zyprexa Mod EPS olanzapine Low EPS SGA SGA ANTIPSYCHOTICS • Indications • Schizophrenia • Bipolar • OCD • Severe depression • Mechanism of Action • Typicals – block D2 receptor (dopamine) • Common extrapyramidal SE • Atypicals – block D2 AND 5HT (dopamine and serontonin) • produce fewer extrapyramidal SE because they are loosely bound to D2 receptors • Weight gain, DM, and dyslipidemia common ANTIPSYCHOTICS • Conventional/Typical Antipsychotic • chlorpromazine/Thorazine • haloperidol/Haldol* • Atypical Antipsychotics • olanzapine/Zyprexa • risperidone/Risperdal • quetiapine/Seroquel ANTIPSYCHOTICS: MOA • All antipsychotics have a COMMON MOA • Block dopamine receptors in the brain • thus ↓ dopamine concentration in CNS • Atypical antipsychotics block specific DOPAMINE receptors • as well as specific SEROTONIN receptors in the brain (5HT) SIDE EFFECTS OF ANTIPSYCHOTICS ANTICHOLINERGIC METABOLIC EXTRAPYRAMIDAL SYMPTOMS (EPS) Movement disorders Acute dystonia- dry mouth Weight gain blurred vision Dyslipidemia photophobia Heart disease urinary retention Diabetes Parkinsonism - bradykinesia, masklike facies, drooling, tremor rigidity, shuffling gait, stopped posture, cogwheeling – occurs early in t Akathsia - uncontrollable urge to be in motion (pacing and squirming) – occurs early in tx constipation tachycardia severe spasms of neck, tongue, face, or back – occurs early in tx (hours/days) * Seen more with the NEWER antipsychoitcs Tardive Dyskinesia MOST TROUBLING SE- OCCURS LATE IN THERAPY occurs in 15-20% of pts thought to be r/t over activation of dopamine receptors making them super sensitive no good management or treatment NEUROLOGICAL SIDE EFFECTS OF ANTIPSYCHOTICS Acute Akathisa Dystonia Parkinsonism Tardive Late/chronic Tardive Dyskinesia “Chronic” Perioral Movements AKATHISIA • Means “inability to sit still” • Subjective distress • Akathisia can be confused with agitation • Frequently occurs 5-30 days after therapy begins • Can occur with not only FGA but also with • the 2nd generation atypicals ACUTE DYSTONIA • Intermittent and sustained contractions of muscles of the tongue, face, neck and back • Typically occurs during the first 5 -30 days of treatment • Responds rapidly to anti-parkinsonism agents and Botox PARKINSONSIM • Antipsychotics can induce symptoms similar to parkinson’s disease • Generally happens 5-30 days after starting tx • • • • tremor muscle rigidity stooped posture shuffling gait TARDIVE DYSKINESIA Tardive dyskinesia (TD) Involuntary contractions of oral and face muscles choreoathetosis (wave-like movements of extremities) Starts as slow, worm-like movements of the tongue Can interfere with chewing, swallowing, speaking Malnutrition and weight loss can occur Over time involuntary movements of the limbs, toes, fingers, and trunk occur SUMMARY SE OF ANTIPSYCHOTICS Conventional/ Typical (FGA) Atypical Drugs haloperidol/Haldol chlorpromazine/Thorazine quetipaine/Seroquel aripiprazole/Abilify olanzapine/Zyprexa Common Side Effects Extrapyramidal Weight gain Anticholinergic effects Type 2 DM Anti-cholinergic SE (dry mouth, blurred vision, photophobia, (SGA) Cardiac Disease urinary retention/hesitancy, tachycardia) Sedation