Arrhythmias associated with drug toxicity.

Cardiac arrhythmias may result from poisoning by a variety of agents. Although some cardiac disturbances are of limited concern, others occur because of the specific cardiac properties of the ingested drugs, and require specific antidotes. Clinicians must understand the resultant pathophysiology so that therapy is appropriate. This article focuses on drugs that cause ventricular arrhythmias and bradyarrhythmias.