This paper provides a broad overview of schizophrenia as a major psychiatric disorder, examining its five recognized subtypes, characteristic symptoms, and the ongoing uncertainty surrounding its causes. The paper discusses genetic, neurobiological, and developmental theories of the disease, including the roles of dopamine and serotonin in symptom production. It also covers the evolution of antipsychotic drug treatments from early neuroleptics to second-generation medications such as Clozaril and aripiprazole, the diagnostic criteria used by clinicians, and the social and economic burden schizophrenia places on individuals, families, and society. The paper draws on sources from the American Psychiatric Association and peer-reviewed journals.
Schizophrenia is a group of psychotic disorders characterized by disturbances in thinking, cognition, affect, behavior, and communication that last longer than six months. There are five recognized types of schizophrenia: catatonic, paranoid, disorganized, undifferentiated, and residual.
Delusions, hallucinations, catatonic behavior, and disorganized thinking are among the primary symptoms. No single characteristic is present in all types of schizophrenia. The cause of schizophrenia remains unknown, though numerous theories have been proposed to explain the development of this disorder. Genetic factors may play a role, as relatives of a person with schizophrenia are more likely to develop the disorder themselves. Psychological and social circumstances may also contribute to the onset of the disease.
The term "schizophrenia" refers to one of the most debilitating and baffling mental illnesses known. Though it has a specific set of symptoms, this illness varies in its severity from individual to individual, and even within any one affected individual from one time period to another.
Generally, schizophrenia begins during adolescence or young adulthood. Its symptoms appear gradually, and family and friends may not notice them as the illness takes initial hold. Often, the young man or woman feels tense, cannot concentrate or sleep, and withdraws socially. But at some point, loved ones realize the patient's personality has changed. Work performance, appearance, and social relationships may begin to deteriorate.
The word "schizophrenia" comes from two Greek words — schizo, meaning "split," and phrenia, meaning "mind." This does not mean that a person with the disorder has a split personality; rather, parts of the mind appear to function separately from each other. In general, schizophrenia has a profound effect on thinking and functioning, impairing a person's ability to care for themselves and to respond to their environment in an appropriate manner.
Researchers do not know the specific causes of schizophrenia, though most believe that it is primarily a physical brain disease. Some believe that the neurotransmitter dopamine is involved in producing the hallucinations, delusions, thought disorders, and blunted emotional responses associated with this mental illness. Most medications prescribed for schizophrenia affect dopamine levels in the brain while simultaneously reducing the painful mental and emotional symptoms of the disorder.
A major theory in the causation of schizophrenia is that it originates in the developing fetal brain. During fetal brain development, nerve cells multiply, divide, and form connections with each other. According to this theory, the primary physical defect in the brains of many people with schizophrenia is that certain nerve cells migrate to the wrong locations when the brain is first forming, leaving small areas of the brain permanently misplaced.
Through brain scans and animal studies, researchers have been identifying specific brain areas — including the prefrontal cortex — that malfunction in schizophrenia, uncovering factors that may contribute to the development of the disease, and revealing how anti-schizophrenia drugs work and how they may be improved. Performance on both working memory and long-term memory tasks has revealed disturbed dorsolateral prefrontal cortex activation in schizophrenia, with medial temporal deficits also present. Some evidence points to more severe cognitive and functional deficits with verbal than nonverbal stimuli, though these results have been mixed.
Most psychiatrists today believe that genetic predisposition, environmental factors such as viral infection, and stressors such as poverty and emotional or physical abuse together form a constellation of risk factors that must be taken into account when understanding schizophrenia. Medications targeting both dopamine and serotonin receptors have proven more effective in suppressing and managing the symptoms of schizophrenia than earlier single-target approaches.
In schizophrenia, there are both positive and negative symptoms. Negative symptoms involve more inward signs, while positive symptoms involve more outward or observable signs. Among the first symptoms to appear is emotional coldness: the patient neither desires nor takes pleasure from close relationships, and consistently chooses solitary activities. The patient may have no desire for sexual experiences, take part in few or no pleasurable activities, have no friends outside of family members, and remain unresponsive to praise or criticism.
People with schizophrenia may experience a perception of reality that is markedly different from what those around them see and understand. Living in a world distorted by hallucinations and delusions, people with schizophrenia may feel frightened, confused, and overwhelmed. As a result of the unusual realities they experience, they may behave very differently at different times. Occasionally they may appear detached, withdrawn, or preoccupied, and may even sit motionlessly for hours without speaking.
For a person to be diagnosed with schizophrenia, they must experience a break from reality that persists for at least six months. Clinicians must also rule out substance use, which can produce behavior similar to schizophrenia. Depression, delusional disorders, and schizoid personality disorder must also be excluded. The clinician must also determine that the person is socially withdrawn. According to the book Negative Symptom and Cognitive Deficit Treatment Response in Schizophrenia, edited by Richard S.E. Keefe, Ph.D., and Joseph P. McEvoy, M.D., these complex assessment issues are rarely addressed adequately in empirical studies of patients with schizophrenia.
According to Dr. Andrew J. Cutler, president of Coordinated Research of Florida, Inc., and Clinical Assistant Professor in the Department of Psychiatry and Behavioral Medicine, anxiety complicates the management of schizophrenia and makes treatment more difficult. The patient often begins to believe that people around them are conspiring against them. The disorder affects patients not only psychologically but also physically — patients may struggle to process incoming sensory information and to regulate their physical responses, undermining their ability to navigate everyday situations.
In the early days of treatment, schizophrenics often endured electroshock therapy, which was painful and of limited benefit to patients' well-being. Antipsychotic, or neuroleptic, drugs are now the standard means of managing the symptoms of schizophrenia. This group of drugs includes the phenothiazines, thioxanthenes, butyrophenones, dihydroindolones, and dibenzoxazepines. Drug treatment is ongoing because relapse of symptoms is common when medication is discontinued. Psychotherapy may be beneficial in some situations. There is no known means of preventing schizophrenia.
The primary drug currently used for treating schizophrenia is Clozaril (clozapine), which has been reformulated from its versions of the 1970s and 1980s to reduce side effects. There are numerous approaches people choose in managing schizophrenia, but there is still no definitive cure for the disease. Physicians have refined medical treatments, although a persistent challenge is keeping patients on their medications, which carry numerous side effects. Various alternative treatments have also been explored.
"Antipsychotics, Clozaril, and aripiprazole"
"Cost burden and societal effects of schizophrenia"
"Future treatments and call for continued research"
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