Showing posts with label Antipsychotics. Show all posts
Showing posts with label Antipsychotics. Show all posts

Thursday, May 22, 2014

The Matrix: Was Neo Psychotic?




Auditory Hallucinations
Psychosis is a mental health problem that can  stop the person from thinking clearly, telling the difference between reality and their imagination, and acting in a normal way.

Morpheus: What is "real"? How do you define "real"?

It is a loss of contact with reality that usually includes delusions and hallucinations. Delusions are false beliefs about what is taking place or who one is, such as thinking that someone is plotting against you or that the TV is sending you secret messages. Hallucinations are false perceptions, such as hearing, seeing, or feeling something that is not there. 


Neo: What did she tell you?
Morpheus: That I would find the One. 


Signs of Psychosis
The early stage of psychosis is marked by a difficulty in concentrating, depressed mood, sleep changes - sleeping too much or not enough, anxiety, suspiciousness, withdrawal from family and friends and on-going unusual thoughts and beliefs. While the later stages involve being confused and having impaired reality testing; that is, people are unable to distinguish personal, subjective experiences from the reality of the external world. This can progress onto delusions, hallucinations, disorganized speech (switching topics erratically), difficulty functioning, depression and even suicidal thoughts or actions.
 

Morpheus: I see it in your eyes. You have the look of a man who accepts what he sees because he is expecting to wake up. Ironically, that's not far from the truth.


Causes:

A Psychoactive Aetiology?
A number of medical problems can cause psychosis, including:

- Alcohol and certain illegal drugs (or blue and red pills?)
- Brain diseases, such as Parkinson's  
- Huntington's disease, and certain chromosomal disorders
- Brain tumours or cysts
- Dementia (including Alzheimer's disease)
- HIV and other infections that affect the brain
- Some prescription drugs, such as steroids and stimulants
- Some types of epilepsy
- Stroke







Symptoms:
Psychotic symptoms may include: disorganized thought and speech, false beliefs that are not based in reality (delusions), especially unfounded fear or suspicion, and thoughts that "jump" between unrelated topics (disordered thinking).







Neo: I thought it wasn't real
Morpheus: Your mind makes it real


Exams and tests:
Psychiatric evaluation and testing are used to diagnose the cause of the psychosis. Laboratory testing and brain scans may not be needed, but sometimes can help pinpoint the diagnosis. The type of tests may include; blood tests for abnormal electrolyte and hormone levels, blood tests for syphilis and other infections, drug screens, and sometimes an MRI of the brain.



''Yeah...ehmm...sorry about that''



Possible Complications:
Psychosis can prevent people from functioning normally and caring for themselves. If the condition is left untreated, people can sometimes harm themselves or others (or Trinity).







 Morpheus: You've been living in a dream world, Neo.
 
 
''Your 50 minutes are up young man''
 


Treatment often depends on the cause of the psychosis. It might involve drugs to control symptoms and talk therapy, which can help address the underlying cause of the psychosis.

For example the talking therapy cognitive behavioural therapy has proved successful in helping people with schizophrenia.  Hospitalization is an option for serious cases where a person might be dangerous to himself or others.




''Perhaps we are asking the wrong questions'' ~ Agent Brown 





 
Social support should also be addressed, so as to help support the person with psychosis, who may have social needs such as education, employment or accommodation.


 
 
 
 
 
  
 
 
Agent Smith: It seems that you've been living two lives. One life, you're Thomas A. Anderson, program writer for a respectable software company. You have a social security number, pay your taxes, and you... help your landlady carry out her garbage. The other life is lived in computers, where you go by the hacker alias "Neo" and are guilty of virtually every computer crime we have a law for. One of these lives has a future, and one of them does not.

''The need to prove who you are will vanish once you know who you are''
~ Pierre
 
 
 
 
Similar to Parkinson's Disease and Schizophrenia, dopamine levels are thought to be too high during psychosis, or better, there is a 'functional excess' of dopamine in the person's brain. This can affect memory, emotion, social behaviour and self-awareness.












Bizarre delusions are often experienced during psychosis.

Examples of psychotic delusions include the paranoid type - more likely to be associated with schizophrenia - and delusions of grandeur.










''Sure ye do''

Delusions of grandeur: clearly false but strongly held beliefs in having a special power or authority - the person with psychosis may, as examples, believe that they are a world leader, very rich, that they are able to bring dead people back to life, or that they can control the weather.
 
While the classic hallmarks of psychosis are hallucination and delusion, other symptoms persist in disorders such as schizophrenia - known as negative symptoms. That is, cognitive and motivational impairments, which can be disabling and do not respond to drug treatment.




I think he saw me...
 
 
Paranoid delusions: these may cause the person with psychosis to be unduly suspicious of individuals or organisations, believing them to be plotting to cause them harm. Such delusions can be very frightening and may result in unusual behaviour to avoid things - for example, staying out of a room with certain devices in it, believing them to be controlling thoughts, or locking up the front door with an excessive number of padlocks.
 





Similar to Eric Bui and colleagues examining Borderline Personality Disorder and Darth Vader (2010), it is interesting to compare a disorder with something relevant, in an attempt to try and identify with it. While one is the work of fiction and the other a real life debilitating disorder, slight overlap can be seen and the crude comparisons hopefully elucidate the disorder a little.
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Freudenreich O, Weiss AP, Goff DC. Psychosis and schizophrenia. In: Stern TA, Rosenbaum JF, Fava M, Biederman J,    Rauch SL, eds. Massachusetts General Hospital Comprehensive Clinical Psychiatry. 1st ed. Philadelphia, Pa: Mosby Elsevier; 2008:chap 28.
 
Katherine Darton, Mind. Psychotic experiences. London, UK: Mind, 2011. Information published online, accessed November 21st, 2013.

MedlinePlus. Psychosis. Bethesda, MA, US: National Library of Medicine, National Institutes of Health, Department of Health and Human Services.
 
NHS Choices. Causes of psychosis. London, UK: National Health Service.
 
Van Os J, Kapur S. Schizophrenia. The Lancet, 2009, volume 374, number 9690, pages 635-645 (DOI: 10.1016/S0140-6736(09)60995-8).

WHO. Chapter V: Mental and behavioural disorders. In: International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10). Geneva, Switzerland: World Health Organization, 2010.
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''Minds that have withered into psychosis are far more terrifying than any character of fiction''
                                                                                                                                   ~ Christian Baloga

Thursday, May 01, 2014

Neuroleptic-Induced Dystonia

Dystonia is a neurological movement disorder which may affect anyone at any age. It is characterised by involuntary muscle contractions which force certain parts of the body into abnormal, sometimes painful, movements or postures. Dystonia can affect any part of the body including the arms and legs, trunk, neck, eyelids, face, or vocal cords.


The disordered tonicity of muscles that occurs in dystonia can also be associated with neuroleptics, a dopamine antagonist drug. This secondary, or acquired dystonia, can be a problem encountered specifically with the use of antipsychotic medication (Hansen, 1997), as one side effect of these drugs is debilitating movement disorders known as extrapyramidal symptoms (Yamamoto & Inada, 2012). Drugs that decrease the effectiveness of neurotransmission are known as antagonists. Antipsychotic medication blocks dopamine receptors and this in turn can lead to the dystonic reactions.


With Parkinson’s, the disease is caused by cell death in the substantia nigra, which has dopamine producing functions. This loss of dopamine activity results in a decreased stimulation of the motor cortex which can lead to movement disruptions in the body. Similarly, the dopamine blockade effect of neuroleptic antagonists reduces the activity of transmitters in the synapse causing involuntary muscle contractions (Hansen, 1997). Therefore the severe disturbances of motor behaviour are often caused by the drug-induced dysfunction of the dopaminergic extrapyramidal system, which plays a vital role in movement control (Smelser & Baltes, 2001).

Extrapyramidal symptoms can be categorised as acute and tardive. Acute dystonia has a sudden onset and is often seen within the first five days of starting an antipsychotic course of treatment. Conversely, tardive begins after a long-term use of dopamine antagonist medication (Van Harten & Kahn, 1999).


Neuroleptic-Induced acute dystonia can result in abnormal positioning or spasm of muscles in the head, such as the eyes (oculogyric), neck (impaired swallowing), limbs, and trunk. Acute dystonic reactions generally disappear once the drug dose is lowered or there is complete cessation of the antipsychotic (Yamamodo & Inada, 2012). With tardive dystonia there is currently no established course of treatment, however administration of clozapine has been cited as the only drug helpful if it is tolerated by the patient.
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''Life has many twists and turns.
But when it literally involves your body, then the above saying takes on a whole different meaning''

Wednesday, April 09, 2014

First-Generation and Second-Generation Antipsychotics

Antipsychotic medication (or neuroleptics) are an effective treatment for people with schizophrenia. In 1952, Henri Laborit, a surgeon in Paris, was looking for a way to reduce surgical shock in his patients. Much of the shock came from the anaesthesia, and if he could find a way to use less, his patients could recover quicker. He knew that shock was a result of certain brain chemicals so he looked for a chemical to counteract these.
 
His administration of a drug called Chlorpromazine had a marked effect on his patients. Previously restrained and often violent patients could now make contact with others and be left without supervision. It seemed to have a calming effect without sedating his patients. It was then trialled for a number of psychiatric disorders. Some being successful, however there were side effects and drawbacks to the drug which were revealed in the passing years.
 
Following the introduction of first-generation (typical) antipsychotics (FGAs) in the early 1950s, there was a radical change in the therapeutic regimens for schizophrenia.
 
But, as noted, it soon became apparent that these antipsychotics produced serious side effects including extrapyramidal symptoms (EPS) - a distressing and debilitating movement disorder. The extrapyramidal system itself is a neural network that is part of the motor system.
 
Along with extrapyramidal symptoms, other side effects of FGAs included;
- Neuroleptic Malignant Syndrome (NMS), a rare, but life-threatening idiosyncratic reaction to the medication. The syndrome is characterised by muscle rigidity, fever and a sudden raised body temperature which can be fatal. Incidence rates range from 0.02 to 3%. 
- Drowsiness, dry mouth, weight gain, constipation, depression.
 
To prevent EPS, second-generation (a-typical) antipsychotics were developed. These newer medications differed from FGAs primarily on the basis of their reduced risk of inducing EPS (Yamamoto  & Inada, 2012).
 
Neuroleptics work via the blockade of dopamine receptors. Dopamine is one of several transmitters that act on the central nervous system, and numerous dopamine receptors have been found in the extrapyramidal system. Dopamine D2 receptors are those most strongly associated with the efficacy of antipsychotics.
 
Second-generation antipsychotics are effective against psychosis and, at therapeutic doses, seldom cause EPS. Their therapeutic effects are attributable to central antagonism of both serotonin and dopamine receptors, and also possibly to relatively loose binding to D2 receptors (Lehan, 2004).
 
Controversy still lingers over the efficacy of first and second generation antipsychotics. Second generation antipsychotics were seen as an advance in drug treatment 20 years ago when they were developed, as they had additional benefits and fewer adverse effects. However, the invention of second-generation drugs have been regarded by some as invention only, a clever manipulation by the drug industry for marketing purposes, and there is often selective publication of trials that can skew the evidence in favour of a drug preferred by the investigators. Leucht and colleagues (2008) compiled a meta-analysis titled, 'Second-generation versus first-generation antipsychotic drugs for schizophrenia'. There were 150 trials examined. In 95 of them, the second-generation antipsychotic was compared with the high-potency first-generation antipsychotic Haloperidol. The use of Haloperidol showed a bias in favour of the second-generation drugs. Because this first-generation drug is likely to be associated with a high rate of EPS. They also avoided comparison with a medium-potency FGA, because these drugs are just as efficacious as the second-generation drug.

 
Antipsychotic drugs differ in their potencies and have a wide range of adverse effects, with nothing that clearly distinguishes the two groups. The only second-generation antipsychotic that is better than other drugs in resisting schizophrenia is clozapine. Nevertheless, it is argued that second-generation drugs have no special a-typical characteristics, that they are no more effective, do not improve specific symptoms, are less cost effective, and have no clearly different side effects than first-generation drugs (The Lancet, 2009).


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