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Metabolic disturbance in first-episode schizophrenia
1Senior Lecturer in Psychiatry, Royal College of Surgeons in Ireland, Dublin. jthakore@rcsi.ie
Background:
Schizophrenia shortens life, e.g. through suicide and obesity-related diseases such as type 2 diabetes mellitus. It is assumed that medications play a major role, but most of the evidence for this comes from studies poorly controlled for variables such as lifestyle and medication status.
Aims:
To determine whether schizophrenia is associated (independently of medication) with the development of certain metabolic disturbances and whether these might be explained by stress axis dysfunction.
Method:
Literature review.
Results:
Most studies did not control for confounding factors such as previous usage of medication, lifestyle, age and ethnicity. A few conducted in drug-naïve patients with first-episode schizophrenia appear to indicate that these patients have higher than expected rates of visceral obesity and impaired fasting glucose concentrations, which may be related to a subtle disturbance of the hypothalamic-pituitary-adrenal axis.
Conclusions:
Schizophrenia is independently associated with physical illnesses that have a metabolic signature. Therefore, patients need to have a thorough physical assessment at diagnosis and at regular intervals thereafter. Metabolic disturbances have been found in drug-naïve patients with first-episode illness and may be an inherent part of the illness.
Insights
Schizophrenia is linked to metabolic issues like obesity and impaired glucose, independent of medication. These metabolic disturbances may be an inherent part of the illness, requiring regular patient assessment.
Area of Science:
- Psychiatry
- Metabolic Medicine
- Endocrinology
Background:
- Schizophrenia significantly reduces lifespan, often due to suicide and metabolic diseases like type 2 diabetes mellitus.
- The role of antipsychotic medications in these metabolic disturbances is often unclear due to confounding factors in research.
- Existing evidence is limited by poor control for lifestyle, medication history, and other variables.
Purpose of the Study:
- To investigate the independent association between schizophrenia and metabolic disturbances, irrespective of medication.
- To explore the potential role of stress axis dysfunction in these metabolic changes.
- To identify inherent metabolic signatures of schizophrenia.
Main Methods:
- A comprehensive literature review was conducted.
- Studies were analyzed for their control of confounding variables such as medication status, lifestyle, age, and ethnicity.
- Focus was placed on research involving drug-naïve, first-episode schizophrenia patients.
Main Results:
- Most studies lacked adequate control for confounding factors.
- A subset of studies in drug-naïve, first-episode schizophrenia patients indicated higher rates of visceral obesity and impaired fasting glucose.
- These metabolic abnormalities may be linked to subtle hypothalamic-pituitary-adrenal axis dysfunction.
Conclusions:
- Schizophrenia is independently associated with physical illnesses exhibiting a metabolic signature.
- Metabolic disturbances are present even in drug-naïve patients, suggesting they may be intrinsic to the illness.
- Comprehensive physical and metabolic assessments are crucial for schizophrenia patients at diagnosis and regularly thereafter.
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