Schizophrenia

Clinical presentation and the concept of schysis

The core of the disorder is schysis (from Greek schiso — splitting), a fundamental impairment in which the unity of mental functions is lost. This is not a single symptom, but a basic property of the disease manifested in the discoordination of thinking, emotions, and motor activity.

Symptoms are conventionally divided into two major groups:

• Negative symptoms (deficit symptoms): progressive personality changes. These include increasing withdrawal (autism), loss of interest in life, formal thinking, and emotional impoverishment. In severe cases, a profound apathetic-abulic deficit (so-called "schizophrenic dementia") develops.
• Positive symptoms: delusions, hallucinations, catatonia. Their common feature is pronounced internal contradiction. The patient may exhibit alienation of their own thoughts (ideational automatism) or feelings (pseudohallucinations, cenesthesias), and a blurring of the boundaries between reality and fantasy (oneiroid state).

Classification and ICD-10 criteria (Category F20)

In ICD-10, the boundaries of schizophrenia were significantly narrowed compared to historical approaches. The most malignant, process-based variants were taken as the basis.

A diagnosis of schizophrenia is made if psychosis is present for strictly more than 1 month. If a similar psychosis lasts less, the condition is classified as an acute transient psychotic disorder (F23), which can only be reclassified to category F20 after one month has elapsed.

Key diagnostic criteria (one clear or two less pronounced are sufficient):

• Experience of outside interference in thoughts (thought withdrawal, insertion, or broadcasting);
• Delusions of control, influence, or other absurd persistent delusional ideas;
• Persistent verbal pseudohallucinations (voices commenting on behavior or conversing with each other);
• Catatonic disorders;
• Pronounced thought disorders (tangentiality, looseness, thought blocking (sperrung), neologisms);
• Increasing apathy, withdrawal, and inactivity.

Historical concepts: E. Kraepelin and E. Bleuler

Until the late 19th century, various manifestations of psychoses (hebephrenia, catatonia) were considered separate diseases. Emil Kraepelin united them under the common name dementia praecox (premature dementia). He relied on catamnesis: all these conditions begin in youth and inevitably lead to profound mental deterioration.

Later, Eugen Bleuler, applying a psychoanalytic approach, refuted the inevitability of dementia and proposed the term "schizophrenia." He shifted the focus from the outcome to the mechanism of the pathology itself — the discordance (incoherence) of the psyche.

Bleuler identified:

1. Primary disorders: thought and affective disorders, the inability to emotionally evaluate the world, autism.
2. Secondary disorders: delusions and hallucinations, which are merely a consequence of applying distorted formal logic.

Psychic automatism syndrome and first-rank symptoms

Positive symptoms are not mandatory for diagnosis, but are extremely characteristic. In 1925, K. Schneider described "first-rank symptoms," which include the patient's conviction that their thoughts are being read at a distance, and their feelings and actions are being inserted by someone else.

In the Russian diagnostic school, these manifestations are grouped into the Kandinsky-Clerambault syndrome of psychic automatism. Phenomena of automatism are a classic example of schysis, where unified mental acts are split into "one's own" and "imposed." The syndrome is detected in nearly 55% of patients and serves as a strong argument in favor of the diagnosis.

Epidemiology and gender differences

Schizophrenia affects about 1% of the population, a figure that is stable in most countries. New cases are registered at a rate of 0.5 to 1.5 per 1,000 population per year.

The disease affects men and women with equal frequency, but has gender-specific features of clinical course:

• In men: the disease typically manifests earlier and follows a malignant course, leading to deficit states more rapidly.
• In women: onset occurs later, and the clinical picture is dominated by acute affective-delusional episodes.

Class and exam questions

What else to study on this topic

• Features of schizotypal disorder (F21) and its distinction from true schizophrenia
• Differential diagnosis with chronic delusional disorders (F22)
• Stages of development of the apathetic-abulic deficit ("schizophrenic dementia")
• Detailed structure of the Kandinsky-Clerambault syndrome (types of automatisms)

Other topics in "Chapter 22. Schizophrenia and Related Disorders"

Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.