schizophrenia: an overview of diagnosis and treatment
TRANSCRIPT
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Schizophrenia:An overview of diagnosis
and treatment
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• A disease process with multiple signs and symptoms involving thoughts, perceptions, emotions, and behavior1
• Most catastrophic mental illness1,2
• Peak incidence in males at 15 to 25 years of age and in females at 25 to 35 years of age1
• Global incidence: 1% in all societies3
• Course of illness is extremely variable, often chronic, and sometimes episodic1
• Florid symptoms may diminish with age, although years of dysfunction are rarely overcome1
Epidemiology of Schizophrenia
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Epidemiology of Schizophrenia• Associated with heavy emotional burden4
• Often requires long-term caregiving4
• 50% of patients exhibit comorbid substance abuse
Economic impact
• 22% of all mental illness costs in the United States5
• Annual direct and indirect costs estimated at $65 billion (1991)5
• Annual treatment costs may range from $10,000 to $70,000per patient6-9
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Behavioral Symptoms
Positive SymptomsDelusions
HallucinationsDisorganized speech
SuspiciousnessExaggerated thoughts
CognitionAttention / MemoryOrganized ThinkingJudgment / Insight
Negative SymptomsAffective flatteningAlogia / Avolition
AnhedoniaSocial withdrawal
MoodDepression
ManiaAnxiety / Aggression
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Impact of Mood Symptoms
• Depressive symptoms present in up to 65% of patients
• Affect all other core symptoms
• Affect all outcomes, including compliance
• Higher suicide rate 40% Attempt / 10% Completion
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Clinical IssuesInterplay of Depressive and Other
Symptoms of Illness in SchizophreniaNegative
Symptoms
FunctionalImpairment
ProlactinEffects
CognitiveDysfunctio
n
PositiveSymptoms
EPS
Mood Symptoms
Illness Related Symptoms
Medication Related Side Effects
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Causes of Psychosis
• Dopamine Hypothesis
• Neurotransmitter Interaction
• Structural Abnormalities
• Prenatal or Perinatal Trauma
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Brain Pathways
From:Risch SC. Pathophysiology of schizophrenia and the role of newer antipsychotics. Pharmacotherapy 1996;15(1 pt 2):12S
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9
WorkingMemory
(D1 receptors)
Prefrontal Cortex
Sensory Data
Motor Data
AffectiveData
Behavior
Cognition
Personality
Role of Prefrontal Cortex
Schizophrenia
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Dopamine Activity Overview
• Psychotic Symptoms: – Caused by too much Dopamine activity
in the limbic system
• Extrapyramidal Symptoms: – Not enough Dopamine activity
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Efficacy = Dopamine Blockade
• All Anti-psychotic medications MUST:
– BLOCK DOPAMINE RECEPTORS
• For Superior Efficacy:
– SELECTIVE DOPAMINE BLOCKING
• Degree of dopamine blocking
• Activity in selective areas of the brain (A9, A10)
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Degree of Blockade
• Agent must block 50% of D2 receptors to begin controlling positive symptoms
• Blocking > 70% of D2 receptors may cause dose-dependant EPS
• PUBLISHED DATA SHOWS:
– Zyprexa & Clozaril
• 50-60% D2 Blockade
– Risperdal & Haldol
• 80-90% D2 Blockade
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Selective Dopamine Blockade
• A-10 (Mesolimbic) PATHWAY– The "Efficacy Pathway"– ZYPREXA is theorized to have strong
activity here
• A-9 (Nigral Striatal) PATHWAY– The "EPS Pathway"– Typicals and Risperdal are theorized to be
more active here (vs.. A-10)
A-10 = GOOD A-9 = BAD
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Psychosocial
Pharmacologic
Patient CareThe "Team Approach"
Psychiatrist
Psychiatric Nurse / DON
Psychologist
Medical Director
Primary care physician
Physician Assistant (PA)
Nurse Practitioner (NP)
Consultant / Clinical Pharmacist
Case Manager / Social worker
Family and friends
Psychological Rehabilitation
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Considerations in Choosing Antipsychotics: Acute vs.Continuation
• Time to response: significant response may take 4 to 5 weeks of therapy with conventional agents12
• Symptom control/level of function: persistence of positive, negative, cognitive, or affective symptoms may indicate need to switch
• Incidence of adverse effects: EPS/TD, sedation, cognitive impairment, hypotension, sexual dysfunction (Risks vs. Benefits)
• Cost of therapy, including acquisition price and cost of necessary adjunctive meds or inpatient treatment
• Available formulations: Dosing Flexibility
• Previous experience with an agent or class
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Chemical StructuresCH3
HCH3
Olanzapine QuetiapineClozapine
CH3
CH3
FRisperidone
O
N
N
H
Cl
N
N
N
NN
N
S
O
N
N
N
ON
N
HO
Cl
O
F
Haloperidol
ON
NN
S
OH
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17
ClozapineOlanzapine Haloperidol
Risperidone
H1
21
Musc
5-HT2C
5-HT2A
D4
Quetiapine Ziprasidone
D1
Bymaster FP, et al. Neuropsychopharmacology. 1996;14(2):87-96. Schotte A, et al. Psychopharmacology (Berl). 1996;124(1-2):57-73.
Receptor Binding Profiles
Aripiprazole
D2
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Anti-Psychotic Side Effects:
• Extrapyramidal Symptoms (EPS)– Akathisia: Severe inner restlessness– Dystonia: Involuntary muscle spasms– Parkinsonism: Rigidity of the
muscles, Tremor, Shuffling of feet
"It can be argued that EPS are the most troublesome side effects…a major reason why patients discontinue their drug therapy"*
*Source: Casey DE. International Clinical Psychopharmacology. 1997;12 (suppl 1):S19-S27
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Anti-Psychotic Side Effects:
• TD (Tardive Dyskinesia)– Involuntary muscle movements of the face,
body and/or trunk– Often Irreversible: Patient is disfigured,
"looks like a psych patient"– Typicals carry 5% risk of developing TD
per year of exposure• 85% risk after 25 years of continuous
exposure
*Source: Casey DE. International Clinical Psychopharmacology. 1997;12 (suppl 1):S19-S27
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• Prolactin Related Side-Effects– Short Term
• Amenorrhea• Galactorrea• Gynecomastia• Sexual Dysfunction
– Long Term• Increased risk for Osteoporosis• Increased risk for Breast Cancer
Anti-Psychotic Side Effects:
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Other Limitations ofConventional Anti-Psychotics:• Extrapyramidal symptoms (EPS)
• Tardive dyskinesia (TD)
• Prolactin elevation
• Sedation
• QTc prolongation
• Cognitive impairment
• Orthostatic hypotension
• Compliance / Relapse
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Typical Antipsychotics Haldol, Mellaril, Thorazine, Prolixin, etc.
• Available since the mid - '50s
• Proven positive symptom efficacy
• Formulations:– Short acting ( I.M.)– Long acting (Depot)
• Generics available ($)
• Incomplete symptom efficacy (compared to atypicals)– Negative– Mood– Cognition
• High incidence of EPS• Increased risk for TD• Prolactin-related side effects
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The Bipolar patient...
“My thoughts ran with lightning-like rapidity from one subject to another. All the problems of the universe came crowding in my mind, demanding instant discussion and solution--- mental telepathy, hypnotism, women’s right, all the problems of medical science, religion and politics
Months later……...
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Bipolar Patient cont…..
“I seem to be in a perpetual fog and darkness. I cannot get my mind to work. Instead of associations clicking into place, everything is an inextricable jumble. I could not feel more ignorant, undecided or inefficient. It is appallingly difficult to concentrate, and writing is a pain and grief to me”
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Classifications of Bipolar
• Bipolar I– 1 or more manic or mixed episodes– May be followed by 1 or more depressive
episodes
• Bipolar II– 1 or more depressive episodes– accompanied by at least 1 hypomanic episode
• mania not severe enough to cause “marked impairment”
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Subtypes: Rapid Cycling
– 4 or more mood episodes in 1 year– Occurs in 12-20% of bipolar patients– Occurs later in the illness– Difficult to treat– More common in women– Inducible by antidepressants
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• Racing Thoughts• Distractibility• Poor Insight• Disorganization• Inattentiveness• Confusion
• Delusions• Hallucinations• Sensory Hyperactivity
Symptom Domains in Bipolar I Disorder
Cognitive SymptomsCognitive Symptoms
Psychotic SymptomsPsychotic Symptoms
• Euphoria• Grandiosity• Pressured Speech• Impulsivity• Excessive Libido• Recklessness• Diminished Need
for Sleep
• Depression• Anxiety• Irritability• Hostility• Violence or Suicide
Manic Mood and Manic Mood and BehaviorBehavior Dysphoric Mood Dysphoric Mood
and Behaviorand Behavior
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Symptom Descriptors for Bipolar
Manic Episodes• inflated self-esteem or
grandiosity• decreased need for
sleep• excessive talkativeness• racing thoughts• distractibility• increased physical
activity • pursuit of pleasurable
but risky activities• psychotic features
Depressive Episodes• depressed mood• diminished interests or
pleasure • fatigue• worthlessness or guilt• poor concentration• suicidal thoughts
Increase or decrease in:• weight/appetite• physical activity• sleep
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HypomanicEpisode
BIPOLAR II
Depressive Episode
Manic Episode BIPOLAR I
Mixed Episode
Mood WithinNormal Range
Classifications of Bipolar
Subtypes of Bipolar
RapidCycling
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Epidemiology of Bipolar Disorder
• Psychotic symptoms occur in 47-75% of all patients at some point in the disease cycle
• 2/3 of bipolar episodes present as depression• No differences in race or gender• 50% have a family history• Women with postpartum depression at higher risk• Symptoms usually first appear between the ages of
15-24• Prevalence rates from 1.2% - 1.6%
*Compared to an 18% rate for those without bipolar
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Effect on Social Functioning
• Ability to work declines in 66% of patients• Social functioning declines in 50% of patients• Represents a high divorce rate• 60% suffer from substance abuse issues
– May be self medicating– Masks illness in early stages – Predictor of early onset (before age of 20)
• Significant impact on expected life span and personal health
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Morbidity of Bipolar Disorder
• Recurrent illness in 85-95% of patients
• Functional recovery often lags behind symptomatic and syndrome recovery
• Recurrent episodes may lead to progressive deterioration in functioning
• Number of episodes may affect subsequent treatment response and prognosis
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Mortality in Bipolar Disorder
• 25%-50% attempt suicide
• Suicide completion rate ~19%
• 50% suicidal ideation in mixed mania
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Schizophrenia vs. Bipolar
Schizophrenia Bipolar
Thinking Disorder which can affect mood
Primarily a mood disorder that can affect thinking & judgment
Psychotic disorder
Affective Disorder
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Contrasts of Schizophrenia and Bipolar Disorder
Key Similarities• Generally treated by psychiatrists
• Psychotic symptoms are frequent during mania
• Antipsychotics were drugs of choice through 1960s
– lithium as a "mood stabilizer"
– Awareness of TD risk (greater risk in bipolar ?)
• High utilization of health care system
• Problems with treatment compliance
Key Differences• Different core symptoms
• Different courses of illness
– Bipolar patients are less consistently "sick" and outcomes get closer to "well”
– Bipolar patients are more likely to commit suicide
• Treatment paradigms
– therapeutic setting
– treatment goals
– medication choices
While some similarities exist, mostly a different patient population with different treatment paradigms
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level of
functioning
Bipolar Schizoaffective Schizophrenia
Schizoaffective: has features of both schizophrenia and mood disorders. Best diagnosis for patients whose clinical syndrome would be distorted if it were considered as only schizophrenia or only a mood disorder. (Kaolin and Sadock, 1996)
Related Disease Outcomes
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Diagnosis of Bipolar Disorder
• High rates of misdiagnosis - Important to determine longitudinal course– May be diagnosed as unipolar depression– May be mischaracterized as adolescent behavior– May be masked by substance abuse
• A psychiatrist is most often the one who ultimately makes the correct diagnosis
• Involvement from various members of the health care team (Psychologist, Psych Nurse, etc.)
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Olanzapine Data Suggest Effects AcrossMultiple Neurotransmitter Systems
SYSTEM Olanzapine ActionRelevance to Bipolar
Dopamine Direct DA receptor antagonist
DA antagonists reduce psychotic symptoms
Serotonin Multiple, balanced 5HT receptor antagonist
5HT may affect mood, violence, suicide
AcetylcholineIndirect Ach agonist
Cholinomimetics may reduce mania, improve cognition
GABA Indirect GABA agonist
May help reduce manic symptoms
Glutamate Modulates and stabilizes glutamate transmission
May help regulate mood stability
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Current Treatment Paradigm for Psychiatrists
A/P
Antipsychotics are currently not considered a standardtherapy for long term treatment of bipolar
(For psychosis associated with acute mania)
Maintenance Treatment
MOOD STABILIZER
A/D
For recurrent psychotic features
For recurrent depressive
features
A/P
M/S
A/D
M/S
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Attributes of Ideal Mood Stabilizer for Mania
Adapted from Keck Jr. PE, McElroy SL. In: Nathan PE, Gorman JM, eds.A Guide to Treatment that Works. New York: Oxford University Press, 1997
Rapid efficacy for mania
Treats psychotic symptoms of mania
Broad efficacy (e.g., mixed, rapid cycling)
Reduces depressive elements in mania
Favorable cognitive effects
Long-term usefulness
Safe & well-tolerated
Ease of use
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Young Mania Rating Scale (Y-MRS)
• Elevated mood
• Hypersexuality
• Irritability
• Racing thoughts / flight of ideas
• Disruptive behavior
• Increased activity
• Decreased sleep• Abnormal thought
content• Rapid/pressured
speech• Inappropriate
appearance• Poor insight
Y-MRS was the primary efficacy variable for both studies
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Psychosis in Bipolar Disorder
• Prevalence– 55% of patients had at least one psychotic symptom by
clinician evaluation– 90% of patients had at least one psychotic symptom by
self-report
• More common in mania than in depression
• Stabilized bipolar patients with history of psychotic features have relapse rates two to three times those without history of psychosis
Goodwin FK, Jamison KR, 1990; Keck Jr. PE et al, 1998; Pope HG, Lipinski JF, 1978; Tohen et al, 1990
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Reasons for Non-Compliance
• Symptoms of the illness– Patients don't want to “lose the high”– Feelings of Grandiosity
• Blood monitoring• Stigma of a medication
– Fear of taking an “antipsychotic”
• Unwanted Side Effects – Higher functioning pts - more sensitive?
• Co-morbid substance abuse– Considered the most consistent predictor of poor
compliance• Partial efficacy• Multiple daily dosing
More unique to bipolar disorder
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• Racing Thoughts• Distractibility• Poor Insight• Disorganization• Inattentiveness• Confusion
• Delusions• Hallucinations• Sensory Hyperactivity
Symptom Domains in Bipolar I Disorder
Cognitive SymptomsCognitive Symptoms
Psychotic SymptomsPsychotic Symptoms
• Euphoria• Grandiosity• Pressured Speech• Impulsivity• Excessive Libido• Recklessness• Diminished Need
for Sleep
• Depression• Anxiety• Irritability• Hostility• Violence or Suicide
Manic Mood and Manic Mood and BehaviorBehavior Dysphoric Mood Dysphoric Mood
and Behaviorand Behavior