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A one-year evaluation of calcium channel blocker overdoses: toxicity and treatment
E A Ramoska1, H A Spiller, M Winter
1Division of Emergency Medicine, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania.
Insights
Calcium channel blocker overdose can cause heart problems like hypotension and dysrhythmias. Calcium and dopamine treatments are effective for toxicity, while atropine shows limited use.
Area of Science:
- Cardiology
- Clinical Toxicology
- Pharmacology
Background:
- Calcium channel blockers (CCBs) are widely prescribed for cardiovascular conditions.
- CCB overdose can lead to significant cardiovascular toxicity.
- Understanding effective treatments for CCB toxicity is crucial.
Purpose of the Study:
- To investigate the cardiovascular toxicity associated with calcium channel blocker (CCB) overdoses.
- To evaluate the efficacy of various therapeutic interventions for CCB toxicity.
Main Methods:
- Prospective case series conducted over one year.
- Data collected from three regional poison control centers.
- Involved 139 hospitalized patients following CCB ingestion.
Main Results:
- Common toxicities include hypotension, sinus node suppression, and dysrhythmias.
- Atrioventricular nodal block is more frequent with verapamil overdose (P < .025).
- Calcium (n=23) and dopamine (n=10) showed efficacy in improving blood pressure and cardiac conduction; atropine (n=8) had limited positive responses.
Conclusions:
- Verapamil overdose is particularly associated with atrioventricular nodal depression.
- Calcium and dopamine are valuable treatments for CCB overdose toxicity.
- Atropine may offer some benefit in specific cases.
Study Objective:
To examine the cardiovascular toxicity of calcium channel blockers and the efficacy of various treatments.
Design:
Case series collected prospectively over one year.
Setting:
Three regional poison control centers.
Type Of Participants:
One hundred thirty-nine hospitalized patients who had ingested a calcium channel blocker.
Interventions:
Calcium, dopamine, atropine, isoproterenol, glucagon, and pacemakers.
Main Results:
Hypotension, sinus node suppression, and dysrhythmias often occur with calcium channel blocker overdoses, but atrioventricular nodal block occurs more often with verapamil (chi 2 test, P < .025). Calcium was administered to 23 patients and was efficacious in reversing depression of cardiac conduction and increasing blood pressure. Dopamine was administered to ten patients and was efficacious in increasing blood pressure. Atropine was administered to eight patients, but only two had a positive response.
Conclusion:
Atrioventricular nodal depression is more common with verapamil overdoses. Calcium and dopamine are useful in treating toxicity from calcium channel blocker overdose, whereas atropine is sometimes useful.