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Reactions to contrast media: testing the CNS hypothesis
Radiology
|January 1, 1981
Summary
Central nervous system control of contrast media reactions was investigated. Diazepam and hexamethonium reduced mortality in mice, suggesting CNS involvement in contrast agent adverse effects.
Area of Science:
- Neuroscience
- Pharmacology
- Radiology
Background:
- Contrast media reactions can be severe.
- The role of the central nervous system (CNS) in these reactions is not fully understood.
- Investigating the CNS mechanisms may lead to improved patient safety.
Purpose of the Study:
- To test the hypothesis that contrast media reactions are controlled by the CNS.
- To examine the influence of the limbic system on the hypothalamus.
- To assess the role of autonomic nervous system outflow.
Main Methods:
- Intravenous injection of sodium iothalamate in mice.
- Administration of diazepam and hexamethonium.
- Evaluation of the effect on LD50 and mortality rates.
- Use of methylprednisolone sodium succinate as a control.
Main Results:
- Diazepam and hexamethonium significantly altered the LD50.
- These agents markedly decreased the death rate compared to controls (p < 0.0005).
- High doses of methylprednisolone sodium succinate showed no effect.
Conclusions:
- Findings support the hypothesis that the CNS modulates reactions to contrast media.
- Autonomic nervous system pathways appear involved in contrast agent toxicity.
- Further research into CNS-targeted interventions may mitigate adverse events.