[Toxicity of calcium inhibitors]
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1Service de Réanimation Médicale et Centre Anti-Poisons, Pav. Pasteur, C.H.U., Strasbourg.
Abstract:
Calcium antagonists decrease the intracellular concentration of calcium ions. They act essentially on the smooth vascular muscle, on the cardiac muscle and on the automatic and conducting cells in the heart. At toxic doses these effects induce hypotension, shock and disturbances of sinusal automatism and atrio-ventricular conduction. The toxicity of the different calcium antagonists varies according to their tissue specificity. The treatment of overdose includes gastric lavage, oral activated charcoal, cardiorespiratory support, especially alphamimetic vasopressors for shock or hypotension, adrenaline or cardiac pacing for atrio-ventricular block.
Insights
Calcium antagonists reduce intracellular calcium, impacting heart and vascular muscles. Overdose can cause hypotension and heart conduction issues, requiring specific treatments like vasopressors or pacing.
Area of Science:
- Pharmacology
- Cardiovascular Physiology
- Toxicology
Context:
- Calcium antagonists are widely used cardiovascular drugs.
- Understanding their toxic effects is crucial for patient safety.
- Tissue specificity influences the toxicity profile of different calcium antagonists.
Purpose:
- To elucidate the mechanisms of calcium antagonist toxicity.
- To describe the clinical manifestations of overdose.
- To outline appropriate management strategies for calcium antagonist poisoning.
Summary:
- Calcium antagonists lower intracellular calcium, affecting vascular smooth muscle, cardiac muscle, and cardiac conduction cells.
- Toxic doses can lead to hypotension, shock, and disturbances in heart rhythm and conduction.
- Treatment involves decontamination, supportive care, vasopressors for hypotension, and potentially adrenaline or cardiac pacing for conduction blocks.
Impact:
- Provides essential information for clinicians managing calcium antagonist overdose.
- Highlights the importance of tissue specificity in predicting toxicity.
- Informs the development of safer calcium antagonist therapies and improved treatment protocols.