Schizophrenia - Comorbidity
From Psychology Wiki
Community portal · Tasks to do · News · Help
Clinical · Educational · Ind&Org · Other fields · Professional · Transpersonal · World
Assessment |
Biopsychology |
Comparative |
Cognitive |
Developmental |
Language
Personality |
Philosophy |
Research Methods |
Social |
Statistics
Clinical: Approaches · Group therapy · Techniques · Types of problem · Areas of specialism · Taxonomies · Therapeutic issues · Modes of delivery · Model translation project · Personal experiences ·
Contents |
[edit] Schizophrenia and drug use
The relationship between schizophrenia and drug use is complex, meaning that a clear causal connection between drug use and schizophrenia has been difficult to tease apart. There is strong evidence that using certain drugs can trigger either the onset or relapse of schizophrenia in some people. It may also be the case, however, that people with schizophrenia use drugs to overcome negative feelings associated with the commonly prescribed antipsychotic medication, and the disorder itself, where negative emotion, paranoia and anhedonia are all considered to be core features.
[edit] Hallucinogens
Schizophrenia can sometimes be triggered by heavy use of stimulant or hallucinogenic drugs, although some claim that a predisposition towards developing schizophrenia is needed for this to occur. There is also some evidence suggesting that people suffering schizophrenia but responding to treatment can have relapse because of subsequent drug use.
Drugs such as methamphetamine, ketamine, PCP and LSD have been used to mimic schizophrenia for research purposes, although this has now fallen out of favor with the scientific research community, as the differences between the drug induced states and the typical presentation of schizophrenia have become clear.
Hallucinogenic drugs were also briefly tested as possible treatments for schizophrenia by psychiatrists such as Humphry Osmond and Abram Hoffer in the 1950s. Ironically, it was mainly for this experimental treatment of schizophrenia that LSD administration was legal, briefly before its use as a recreational drug led to its criminalization.
[edit] Cannabis
There is increasing evidence that cannabis use can contribute to the onset of schizophrenia. Some studies suggest that cannabis is neither a sufficient nor necessary factor in developing schizophrenia, but that cannabis may significantly increase the risk of developing schizophrenia and may be, among other things, a significant causal factor. Nevertheless, some previous research in this area has been criticised as it has often not been clear whether cannabis use is a cause or effect of schizophrenia. To address this issue, a recent review of studies from which a causal contribution to schizophrenia can be assessed has suggested that cannabis doubles the risk of developing schizophrenia on the individual level, and may be responsible for up to 8% of cases in the population.48
[edit] Tobacco
It has been noted that the majority of people with schizophrenia (estimated between 75% and 90%) smoke tobacco. However, people diagnosed with schizophrenia have a much lower than average chance of getting and dying from lung cancer. While the reason for this is unknown, it may be because of a genetic resistance to the cancer, a side-effect of drugs being taken, or a statistical effect of increased likelihood of dying from causes other than lung cancer49.
It is argued that the increased level of smoking in schizophrenia may be due to a desire to self-medicate with nicotine. A recent study of over 50,000 Swedish conscripts found that there was a small but significant protective effect of smoking cigarettes on the risk of developing schizophrenia later in life.50 Whilst the authors of the study stressed that the risks of smoking far outweigh these minor benefits, this study provides further evidence for the 'self-medication' theory of smoking in schizophrenia and may give clues as to how schizophrenia might develop at the molecular level. Furthermore, many people with schizophrenia have smoked tobacco products long before they are diagnosed with the illness, and some groups advocate that the chemicals in tobacco have actually contributed to the onset of the illness and have no benefit of any kind.
[edit] Alcohol
Alcohol use by people with schizophrenia is a substantial complication.
Template:Schizophrenia - Comorbidity with alcohol
[edit] Schizophrenia and violence
[edit] Violence perpetrated by people with schizophrenia
Although schizophrenia is sometimes associated with violence in the media, only a small minority of people with schizophrenia become violent, and only a minority of people who commit criminal violence have been diagnosed with schizophrenia.
Research has suggested that schizophrenia is associated with a slight increase in risk of violence, although this risk is largely due to a small sub-group of individuals for whom violence is associated with concurrent substance abuse, active psychotic symptoms, and ceasing psychiatric drugs51. For the most serious acts of violence, long-term independent studies of convicted murderers in both New Zealand52 and Sweden53 found that 3.7%–8.9% had been given a previous diagnosis of schizophrenia.
There is some evidence to suggest that in some people, the drugs used to treat schizophrenia may produce an increased risk for violence, largely due to agitation induced by akathisia, a side effect sometimes associated with antipsychotic medication.54 Similarly, abuse experienced in childhood may contribute both to a slight increase in risk for violence in adulthood, as well as the development of schizophrenia.16
[edit] Violence against people with schizophrenia
Research has shown that a person diagnosed with schizophrenia is more likely to be a victim of violence (4.3% in a one month period) than the perpetrator55.
[edit] Schizophrenia and bipolar disorder
Schizophrenia and bipolar disorder are generally considered to be distinct diagnoses, but people who show multiple symptoms of both disorders are often given the hybrid diagnosis schizoaffective disorder Cite error: Invalid <ref> tag;
refs with no content must have a name The clinical features of such patients suggests that schizophrenia and bipolar disorder are variant expressions of a diathesis, because of the similar incidence,similar sex ratio and age at onset.
[edit] See also
[edit] References & Bibliography
[edit] Key texts
[edit] Books
[edit] Papers
[edit] Additional material
[edit] Books
[edit] Papers
[edit] External links
| This page uses content from the English-language version of Wikipedia. The original article was at Schizophrenia. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License. |
