Management of Calcium Channel Blocker Toxicity
Summary
Calcium channel blocker (CCB) overdose presents as profound hypotension, bradycardia and, in severe cases, cardiogenic shock. The principal mechanism involves impaired calcium influx into cardiac and vascular smooth muscle cells, leading to reduced myocardial contractility and systemic vasodilation. Early recognition and aggressive supportive care are essential. Initial management focuses on airway protection, intravenous fluid resuscitation and administration of calcium salts to overcome channel blockade. Vasopressors such as norepinephrine and epinephrine may be required to restore vascular tone, while atropine addresses bradycardia. When conventional measures prove insufficient, adjunctive therapies are employed. Hyperinsulinaemia–euglycaemia therapy (HIET) has emerged as a cornerstone intervention, promoting myocardial glucose uptake and improving contractile function. Lipid emulsion therapy serves as a lipid sink to sequester lipophilic CCB molecules. In refractory cases, extracorporeal support techniques, including venoarterial extracorporeal membrane oxygenation (VA-ECMO), provide circulatory and respiratory assistance until drug clearance or organ recovery occurs. Novel extracorporeal detoxification methods such as single-pass albumin dialysis (SPAD) are being explored to enhance toxin removal. A tailored, multimodal approach combining pharmacological and mechanical support can markedly improve survival in life-threatening CCB toxicity.
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Management of Calcium Channel Blocker Toxicity publication trend
The graph below shows the total number of articles in management of calcium channel blocker toxicity across all publications each year (not limited to Nature Index journals).
Technical terms
Calcium channel blocker (CCB): A class of drugs that inhibit L-type calcium channels, reducing cardiac contractility and causing vasodilation.
Hyperinsulinaemia–euglycaemia therapy (HIET): High-dose insulin infusion with glucose to maintain normal blood sugar, improving cardiac metabolism and contractility.
Venoarterial extracorporeal membrane oxygenation (VA-ECMO): A mechanical support system that oxygenates blood and provides circulatory assistance for severe cardiac or respiratory failure.
Single-pass albumin dialysis (SPAD): An extracorporeal detoxification technique using albumin-enriched dialysate to bind and remove highly protein-bound toxins.
References
- Bench-to-bedside review: Hyperinsulinaemia/euglycaemia therapy in the management of overdose of calcium-channel blockers. Critical Care (2006).
- High dose insulin therapy, an evidence based approach to beta blocker/calcium channel blocker toxicity. DARU Journal of Pharmaceutical Sciences (2014).
- Single-Pass Albumin Dialysis as Rescue Therapy for Pediatric Calcium Channel Blocker Overdose. Journal of Investigative Medicine High Impact Case Reports (2022).
- Life-threatening amlodipine and irbesartan poisoning in two adolescents: Extracorporeal life support is life-saving. Trends in Pediatrics (2024).
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