Schizophrenia
Schizophrenia is serious chronic brain disorder, affects approximately 1% of global population. Symptoms of schizophrenia is hallucinations, delusions, disorganized speech, decreased emotional expression, avolition, and cognitive impairment.
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Schizophrenia: Definition, Symptoms, Causes, and Risk Factors
Diagnosis
Diagnosing schizophrenia involves a detailed history, mental status examination, risk assessment, evaluation of substance use, and information from family members to ensure an accurate diagnosis.
History examination
History of present status- The history of present illness helps doctors understand when symptoms started, what caused them, what worsens them, and whether other mental health conditions are present, which is essential for an accurate diagnosis.
Past psychiatric history- Past psychiatric history helps clinicians understand the patient’s previous mental health episodes, treatments, medication responses, and any history of suicide risk (suicidal thoughts, plans, and attempts), self-harm, or aggression, which is important for diagnosis and treatment planning.
Substance use history- Substance use history involves documenting the patient’s use of tobacco, alcohol, drugs, and prescription medications to understand their possible impact on mental health and diagnosis.
Medical history
During evaluation, clinicians record the patient’s medical history, including current illnesses, medications, allergies, previous treatments or surgeries, parity, and other relevant health issues such as neurological conditions and sleep disturbances. They also assess possible organic causes of psychosis, including Parkinson disease, Multiple sclerosis, Syphilis, HIV/AIDS, brain lesions, heavy metal toxicity, Delirium, metabolic or endocrine disorders, and dementias such as Alzheimer disease, Frontotemporal dementia, and Lewy body disease.
Family history
Family history helps identify mental illnesses, treatment responses, and suicidal or aggressive behaviors among biological relatives, which may indicate a genetic predisposition to psychiatric disorders.
Personal and social history
Personal and social history helps clinicians understand the patient’s social environment, life experiences, and cultural background, which is important for correctly interpreting symptoms and making an accurate diagnosis.
Developmental history
Developmental history helps clinicians understand how early life events, development, education, and traumatic experiences may contribute to a person’s mental health condition.
Physical Examination
A physical examination is performed to check the patient’s overall physical health and to rule out other medical conditions. However, examining patients with schizophrenia can be challenging because they may experience anxiety, paranoia, aggression, or other psychiatric symptoms.
Doctors observe the patient’s hygiene, grooming, and overall appearance, which can provide clues about the person’s self-care and daily functioning. Vital signs such as blood pressure, heart rate, temperature, and breathing rate are checked to identify any underlying physical health problems.
Doctors examine the skin to detect substance use or infections and screen for metabolic syndrome, which may occur as a side effect of certain antipsychotic medications.
Mental status examination
Appearance and activity- Patients may look untidy or wear unusual clothing, which may indicate poor hygiene or reduced self-care. Their activity level can vary widely, such as very slow movements or reduced activity (Psychomotor retardation), and restlessness or excessive movement (agitation)
The patient’s interaction with the clinician may differ; they may be cooperative, or sometimes unpredictable, socially withdrawn, or even hostile.
Speech- People with schizophrenia may speak in a disorganized or unclear manner, including going off-topic, producing meaningless word combinations, or creating new words that others cannot understand.
Mood and affect- Doctors evaluate the patient’s emotional state, including whether the person feels hopeless, sad, or depressed. In schizophrenia it may appear little or no expression, or emotional reactions that do not match the situation.
Thought content- Patients may experience delusions and unusual beliefs about their thoughts, including feeling that their thoughts are controlled, shared, or removed by outside forces.
Thought process- In schizophrenia, thought processes may become disorganized, resulting in unclear logic, unrelated ideas, or sudden interruptions in speech.
Perceptual abnormalities- Patients with schizophrenia often experience hallucinations, especially hearing voices, and doctors must check whether these voices command the patient to perform violent or dangerous behavior.
Risk assessment- Doctors evaluate whether the patient has suicidal thoughts, plans, or access to weapons, as well as any self-harm behaviors or aggressive thoughts/actions.
Cognition- Schizophrenia may cause cognitive impairments, affecting memory, attention, and problem-solving abilities. Doctors also check whether the patient is oriented to person, place, and date.
Insight and judgment- Some patients may partly recognize their illness, while others may not realize they have a mental health condition.
Patients may have difficulty making appropriate or sensible decisions. They may also struggle to understand the possible outcomes or consequences of their actions.
Diagnostic criteria for schizophrenia
Doctors use two main classification systems:
- Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR)
- International Classification of Diseases, Tenth Revision (ICD-10)
1. DSM-5-TR
According to DSM-5-TR, the diagnostic parameters for schizophrenia are:
Two or more of the following symptoms must occur for a significant time during at least 1 month.
At least one of the first three symptoms must be present (delusions, hallucinations and disorganized speech)
Delusions – false fixed beliefs
Hallucinations – perceiving things that are not real
Disorganized speech – incoherent or disconnected speech
Grossly disorganized or catatonic behavior – very abnormal or immobile behavior
Negative symptoms – reduced emotional expression or lack of motivation
The person must show significant problems in daily functioning, such as difficulty with work, relationships, or self-care.
Symptoms must persist for at least 6 months, including at least 1 month of active symptoms.
Before or after the active phase, milder symptoms may appear, such as reduced emotional expression or subtle psychotic features.
Other conditions like Schizoaffective disorder, Major depressive disorder, or **Bipolar disorder with psychotic features must be ruled out.
Symptoms should not result from drugs, medications, or another medical condition.
If a person has a developmental disorder, schizophrenia is diagnosed only if clear delusions or hallucinations are present for at least 1 month.
2. ICD-10
According to ICD-10, schizophrenia can be diagnosed if symptoms are present for at least 1 month.
1. At least one major symptom must be present
Thought echo, thought insertion, withdrawal, or broadcasting – feeling that thoughts are being heard, inserted, removed, or shared with others.
Delusions of control or influence – believing that external forces control one’s actions or thoughts.
Voices commenting or discussing the patient – hearing voices that talk about the person or comment on their behavior.
Bizarre or culturally inappropriate delusions – beliefs that are extremely implausible.
2. Or two of the following symptoms must be present
Persistent hallucinations (seeing, hearing, or sensing things that are not real)
Disorganized thinking or speech, including incoherence or neologisms (invented words)
Catatonic behavior (abnormal movements, immobility, or unusual posture)
Negative symptoms such as reduced emotions or lack of motivation
Marked behavioral changes, such as loss of interest and social withdrawal
Classification in ICD-10
Unlike DSM-5-TR, ICD-10 also divides schizophrenia into subtypes based on dominant symptoms, including:
Paranoid schizophrenia
Hebephrenic (disorganized) schizophrenia
Catatonic schizophrenia
Undifferentiated schizophrenia
Post-schizophrenic depression
Residual schizophrenia
Simple schizophrenia
Other or unspecified schizophrenia
Clinical diagnosis
Complete Blood Count (CBC)- A Complete Blood Count is performed to check for anemia or infections, which could cause symptoms that may resemble psychiatric disorders like schizophrenia.
Absolute Neutrophil Count (ANC)- The Absolute Neutrophil Count measures the number of neutrophils (a type of white blood cell).
This test is especially important when a patient is treated with Clozapine, because this medication can reduce white blood cell levels and increase the risk of infection.
Blood chemistry panel– A blood chemistry panel checks different body functions, including electrolytes, kidney function, liver function and thyroid-stimulating hormone (TSH)
Pregnancy test– A pregnancy test is for women of childbearing age.
Electroencephalogram (EEG)- An Electroencephalogram records the electrical activity of the brain.
Doctors may recommend it if the patient’s history or neurological examination suggests possible seizures, to rule out conditions such as Epilepsy that could cause similar symptoms.
CT Scan or MRI – Brain scans like Computed Tomography (CT) Scan or Magnetic Resonance Imaging (MRI) may also be performed.
These tests help detect structural abnormalities in the brain, such as tumors, lesions, or other neurological conditions. MRI is usually preferred because it provides more detailed images of brain structures.
ECG test– An electroencephalogram (EEG) may be indicated based on the neurological examination or history to rule out a seizure disorder.
Genetic testing- Chromosomal or genetic testing may be recommended if the patient’s physical examination or developmental history suggests a possible genetic condition. This helps identify chromosomal abnormalities that might be associated with psychiatric symptoms.
Drug toxicology screen- A Drug Toxicology Screen is performed to detect alcohol, drugs, or other substances in the body.
Some substances can produce psychotic symptoms similar to schizophrenia, so this test helps determine whether the symptoms are substance-induced rather than due to schizophrenia itself.
Additional tests
1. Rapid Plasma Reagin (RPR) Test-This blood test screens for Syphilis, an infection that can sometimes cause psychiatric symptoms similar to schizophrenia.
2. HIV Test-Testing for HIV/AIDS may be recommended because HIV infection can also produce neurological or psychiatric symptoms.
3. Electrocardiogram (ECG)- An ECG measures the electrical activity of the heart. It is performed before starting certain antipsychotic medications such as chlorpromazine, chlorpromazine, droperidol, iloperidone, pimozide,thioridazine, ziprasidone These drugs can affect the QT interval of the heart, so ECG helps detect potential heart rhythm risks before treatment.
4. Abnormal Involuntary Movement Scale (AIMS) or Dyskinesia Identification System- These scales are used to monitor abnormal involuntary movements, which can occur as side effects of antipsychotic medications.
They are usually assessed at baseline and every 6–12 months after starting treatment.
Treatment
Pharmacological managements
Antipsychotic Medications
Patients with schizophrenia be treated with antipsychotic medication and observed for effectiveness and side effects
Antipsychotic medications are divided into
Typical or first-generation antipsychotics (FGAs) and
Atypical antipsychotics or second-generation antipsychotics (SGAs)
Atypical antipsychotics or second-generation antipsychotics (SGAs)
Atypical antipsychotics, also called second-generation antipsychotics (SGAs), were developed in the 1980s as a newer class of drugs for treating schizophrenia.
These medications are about as effective as older (first-generation) antipsychotics, but they usually cause fewer extrapyramidal side effects (movement-related problems such as tremors, rigidity, or restlessness).
Because they generally have a lower risk of severe neurological side effects, doctors often prefer them as the first-line treatment for schizophrenia.
Examples include:
Compared with First‑generation antipsychotics (FGAs), SGAs usually cause fewer movement-related side effects such as:
Extrapyramidal symptoms (movement problems like tremors or stiffness)
Tardive dyskinesia (involuntary repetitive movements)
However, many SGAs have a higher risk of metabolic problems, including metabolic syndrome (weight gain, diabetes risk, high cholesterol). This risk is especially high with:
Olanzapine
Clozapine
Even though these differences exist there is no clear overall preference between FGAs and SGAs. The effectiveness varies from person to person.
The initial dose of antipsychotic drugs depends on several factors such as type or formulation of the drug and patient characteristics (age, health condition, tolerance) and previous use of antipsychotic medications
For most antipsychotics, the dose can be increased quickly to reach an effective level once the patient tolerates the drug well. An exception is Clozapine, which must be increased more slowly due to safety concerns. Even after reaching the correct dose, it usually takes about 2–4 weeks for patients to show the first noticeable improvement in symptoms.
Doctors carefully choose and adjust antipsychotic doses. Younger patients with their first psychotic episode and older adults generally need lower starting doses to reduce side effects and ensure safe treatment.
Typical or first-generation antipsychotics (FGAs)
Conventional or typical antipsychotics are first-generation antipsychotic drugs (FGAs) that were developed earlier than the newer atypical drugs. These medications can be effective in reducing psychotic symptoms such as hallucinations and delusions.
However, they often cause neurological side effects, particularly movement-related problems. One important side effect is Tardive Dyskinesia, a movement disorder that may cause:
involuntary facial movements
lip smacking
tongue movements
abnormal limb movements
In some cases, this condition may be permanent or only partially reversible.
Examples of conventional antipsychotics are:
Cost advantage
These medications are usually cheaper than newer second-generation antipsychotics, especially when generic versions are used. This makes them useful for long-term treatment in some patients.
The use of first-generation antipsychotics (FGAs) has decreased in recent years because doctors now more often prescribe second-generation (atypical) antipsychotics. However, FGAs are much cheaper, so they are still an important treatment option for psychotic disorders, including Schizophrenia.
Long-acting injectable antipsychotics (LAIs)
Some patients with schizophrenia do not regularly take their oral medication, which can lead to relapse of symptoms. In such cases, doctors may use long-acting injectable (LAI) antipsychotics.
LAI antipsychotics are injected instead of taken as daily pills.
They are usually given once every 2–4 weeks.
This helps ensure consistent medication levels and reduces relapse caused by poor adherence.
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