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Regional cerebral blood flow abnormalities in chronic solvent abusers
S Okada1, N Yamanouchi, K Kodama
1Department of Neuropsychiatry, Chiba University School of Medicine, Japan.
Psychiatry and Clinical Neurosciences
|August 25, 1999
Summary
Chronic solvent abuse is linked to reduced cerebral blood flow (CBF) in the prefrontal cortex. This frontal hypoperfusion may underlie amotivational syndrome, impacting social function in abusers.
Area of Science:
- Neuroscience
- Toxicology
- Psychiatry
Background:
- Amotivational syndrome in solvent abusers is associated with poor social prognosis.
- Understanding the neurobiological underpinnings of this syndrome is crucial for effective intervention.
Purpose of the Study:
- To investigate regional cerebral blood flow (CBF) abnormalities in chronic solvent abusers.
- To determine the relationship between CBF changes and amotivational syndrome severity.
Main Methods:
- Single photon emission computed tomography (SPECT) with N-isopropyl-p[123I]iodoamphetamine was used.
- Evaluated 16 chronic solvent abusers and 5 healthy controls.
- Clinical assessment utilized the Scale for the Assessment of Negative Symptoms (SANS).
Main Results:
- Solvent abusers exhibited significantly reduced regional cerebral blood flow (rCBF) in bilateral prefrontal cortices compared to controls.
- The degree of prefrontal hypoperfusion correlated with the severity of avolition-apathy symptoms on the SANS.
- These correlations remained significant even after accounting for antipsychotic medication effects.
Conclusions:
- Chronic solvent abuse is associated with significant rCBF abnormalities, particularly in the prefrontal cortex.
- Frontal lobe hypoperfusion is a potential neurobiological basis for amotivational syndrome in this population.
- Findings suggest a link between neurovascular changes and negative symptoms in solvent abuse.