Summary
Highlights
Psychosis involves a departure from reality, characterized by hallucinations (sensory experiences without input) and delusions (strong, inaccurate beliefs despite evidence). Auditory and visual hallucinations are most common, while delusions often involve grandeur or persecution.
Early concepts by Kraepelin (dementia praecox) and Bleuler (schizophrenia - 'split mind') laid the foundation for understanding the disorder. The DSM criteria for schizophrenia require two or more specific symptoms over a one-month period.
Positive symptoms are active manifestations of abnormal behavior, like delusions (grandeur, persecution) and hallucinations (auditory being most common, linked to Broca's area). Negative symptoms are the absence or insufficiency of normal behavior, such as avolition (lack of persistence), alogia (absence of speech), anhedonia (lack of pleasure), and affective flattening (lack of emotional expression).
Disorganized symptoms include confused speech and behavior, cognitive slippage, tangentiality, and loose associations. Catatonia involves unusual motor responses, such as immobility or agitation, and is considered a severe psychiatric spectrum disorder.
Schizophreniform disorder involves psychotic symptoms lasting between one and six months, while brief psychotic disorder symptoms last less than a month. Both have a relatively good prognosis and can allow individuals to lead normal lives.
Schizoaffective disorder combines schizophrenic symptoms with a mood episode (depression or mania), with psychotic symptoms persisting outside the mood disturbance. Delusional disorder involves persistent delusions without other positive or negative symptoms of schizophrenia, often having a better prognosis.
Catatonia is characterized by unusual motor responses, often seen in psychotic disorders. Psychotic disorders can also be induced by substance use or medication, with drug use being a common trigger for permanent psychotic symptoms.
Schizophrenia affects about 1% of the population, typically developing in early adulthood (early 20s for males, early 30s for females). It is usually chronic, leading to moderate to severe lifetime impairments. Consistent medication adherence is crucial for managing the disorder and leading a normal life, as relapse is common if medication is stopped.
Schizophrenia has a genetic component, with higher risk in families and among monozygotic twins. Neurobiologically, it's linked to elevated dopamine levels in the brain, enlarged ventricles, reduced tissue volume, and less active frontal lobes (hypofrontality). Viral infections during prenatal development, particularly in the first trimester, and marijuana use in at-risk individuals can also increase the risk.
Stress can trigger relapse, and family interactions with high expressed emotions may play a role. The diathesis-stress model helps explain its development. Treatment primarily involves antipsychotic medications, which have side effects but are essential for managing symptoms. Psychosocial interventions, such as community care programs, social skills training, family therapy, and vocational rehabilitation, are also beneficial for managing the disorder. Illness management and recovery programs, cultural considerations, and early intervention are also important aspects of comprehensive care.