3. Schizophrenia is a chronic
heterogeneous syndrome of disorganized and
bizarre thoughts, delusions, hallucinations,
inappropriate affect, cognitive deficits, and
impaired psychosocial functioning
4. • It is a psychotic disorder marked by
severely impaired thinking, emotions and
behaviours. Schizophrenic patients are
unable to filter sensory stimuli and may
have enhanced perception of sounds,
colours and other features of their
environment.
• Most schizophrenics, if untreated can
gradually withdraw themselves from the
interactions with other people and lose their
ability to take care of personnel needs
5. TYPES OF SCHIZOPHRENIA
CATATONIC
Motor symptoms are most notable. The
patient may either demonstrate rigid
immobility or excessive purposeless
movement. The patient may be silent
and withdrawn or may become loud and
shout.
Bizarre voluntary movements such as
posturing may also occur.
The patient may fluctuate between the
two extremes.
DISORGANISED
The patient tends to have
disorganized speech and
behavior with a fl at affect.
Hallucinations
and delusions are not well
formed and fragmented. The
patient may also have bizarre
mannerisms and grimacing.
6. PARANOID
The most common type of
schizophrenia. Patients are
usually preoccupied with
paranoid delusions or auditory
hallucinations. Cognitive
function is usually preserved; if
thought disorder is present, it
does not prevent description of
delusions or hallucinations.
RESIDUAL
The patient does not have
acute psychosis, but some
symptoms of
schizophrenia remain.
Largely negative
symptoms are seen, such
as flat affect, social
withdrawal, and loose
associations. Prominent
delusions or hallucinations
are not present.
7. UNDIFFERENTIATED
The patient meets the criteria for a diagnosis
of schizophrenia but does not meet the
criteria for a specific type, or the patient may
meet the criteria for multiple types of
schizophrenia. No one type appears to be
dominant.
8. EPIDEMIOLOGY
Lifetime prevalence of schizophrenia ranges from 0.6% to
1.9%, with an average of approximately 1%.
The worldwide prevalence of schizophrenia is remarkably
similar among all cultures.
Schizophrenia most commonly has its onset in late
adolescence or early adulthood and rarely occurs before
adolescence or after the age of 40 years.
The prevalence of schizophrenia is equal in males and
females.
10. ETIOLOGY
• No one knows the exact causes of
Schizophrenia, but multiple possible
factors have been discovered.
• These factors include:
1. Genetics
2. Brain chemical imbalance
3. Environmental factors
4. Family history
11. PATHOPHYSIOLOGY
Genetic Theory:
• A strong genetic link exists for the development of
schizophrenia.
Occurs in 1% of general population, however this increases to
10% if a 1st degree relative has a history of schizophrenia.
Risk of developing schizophrenia further increases to 40%
when both parents have a history of schizophrenia.
Studies are going to locate specific genes to the development
of schizophrenia.
12. Dopamine Theory:
• The dopamine hyperactivity in the brain is responsible for
psychotic symptoms present in schizophrenia.
While dopamine hyperactivity is present in mesolimbic
pathway, other areas of the brain such as the prefrontal, frontal
and temporal cortices have decrease activity during acute
psychosis.
Other neurotransmitters thought to be involved in
schizophrenia include 5-HT, glutamate.
The role of glutamate is also being evaluated because one of its
major functions is to regulate dopamine activity. Glutamate
deficiency has been found to cause similar effects to that of
dopamine hyperactivity.
13. Neuro-developmental Theory:
• Schizophrenia occurs as a result of an in
Utero disturbance during pregnancy.
Potential causes of this disturbance include upper
respiratory infection, obstetric complication and
neonatal hypoxia.
14. Psychosocial Theories:
• These theories propose that situation such
as stress, poor interpersonal skills,
conflicting family, communication and
various socio-economic influences are
linked to development of schizophrenia.
15. Neurotransmitter Abnormalities
• Abnormalities in the dopaminergic system
– Hypo-dopaminergic activity in the mesocortical
system, leading to negative symptoms
– Hyper-dopaminergic activity in the mesolimbic
system, leading to positive symptoms
16.
17. • The Diagnostic and Statistical Manual of Mental Disorders,
specifies the following criteria for the diagnosis of
schizophrenia:
✓ Persistent dysfunction lasting longer than 6 months
✓ Two or more symptoms (present for at least 1 month),
including hallucinations, delusions, disorganized speech,
grossly disorganized or catatonic behavior, and negative
symptoms
✓ Significantly impaired functioning (work, interpersonal, or
self-care)
DIAGNOSIS
18. • Schizophrenic patients appear to have small brains with large
ventricular volumes, indicating a relative deficit of neurons.
• Structural and functional brain imaging studies have strongly
suggested that regions of the medial temporal lobe (e.g.,
hippocampus) have diminished numbers of neurons and also
have demonstrated the inability of individuals with
schizophrenia to activate the frontal cortex and successfully
execute tasks that require frontal cortical function.
IMAGING
Ventricular enlargement and cortical atrophy, as seen on CT scan, have
been correlated with chronic course, severe cognitive impairment, and non
responsiveness to neuroleptic medications.
Decreased frontal lobe activity seen on PET scan has been associated with
negative symptoms.
19.
20. TREATMENT
GOALS AND OBJECTIVES:
There is currently no known cure for schizophrenia.
Treatment options include psychotherapy as well as
pharmacotherapy.
The goals and objectives of treatment are as follows:
A. Minimize symptoms of schizophrenia
B. Improve quality of life and social/occupational functioning
C. Prevent relapse and hospitalization
D. Minimize adverse effects of medications
E. Prevent suicide attempts or self-harm
23. First generation or typical antipsychotics:
Chlorpromazine
Trifluperazine
Thioridazine
Perphanazine
Fluphenazine
Haloperidol
Loxapine
24. • Mechanism of Action:
The antipsychotic effect of these medications
is primarily mediated through the blockade of
dopamine type 2 (D2 receptors).
Adverse effects:
Sedation,
anticholinergic effects,
EPS
hyperprolactemia,
moderate weight gain
Photosensitivity
25. Second Generation or Atypical
Antipsychotics
Clonazapine
Risperidone
Olanzapine
Quetipine
Ziprasidone
26. • Mechanism of action:
Atypical antipsychotics are dopamine
antagonists but also block 5-HT2A-receptors
Adverse effects:
Sedation, anticholinergic effects
(Clonazapine, Olanzapine), EPS,
DM, hyperprolactemia
(Risperidone), hypercholestremia
27. References
1. Text book of Clinical Pharmacy and
Therapeutics
2. Text book of Pharmacology by RANG and
DALE’S.
3. Essentials of Medical Pharmacology by
K.D.Tripathi.
