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Amiodarone is an antiarrhythmic medication used to treat and prevent a number of types of cardiac dysrhythmias. [4] This includes ventricular tachycardia, ventricular fibrillation, and wide complex tachycardia, atrial fibrillation, and paroxysmal supraventricular tachycardia. [4]
Antiarrhythmic agents, also known as cardiac dysrhythmia medications, are a class of drugs that are used to suppress abnormally fast rhythms (tachycardias), such as atrial fibrillation, supraventricular tachycardia and ventricular tachycardia. Many attempts have been made to classify antiarrhythmic agents.
Pharmacological cardiotoxicity is defined as cardiac damage that occurs under the action of a drug. This can occur both through damage of cardiac muscle as well as through alteration of the ion currents of cardiomyocytes. [1] Two distinct drug classes in which cardiotoxicity can occur are in anti-cancer and antiarrhythmic drugs.
Side effects attributed to propafenone include hypersensitivity reactions, lupus-like syndrome, agranulocytosis, CNS disturbances such as dizziness, lightheadedness, gastrointestinal upset, a metallic taste and bronchospasm. About 20% of patients discontinued the drug due to side effects.
Serious side effects may include cardiac arrest, arrhythmias, and heart failure. [1] It may be used in pregnancy, but has not been well studied in this population. [3] [4] Use is not recommended in those with structural heart disease or ischemic heart disease. [1] Flecainide is a class Ic antiarrhythmic agent. [1]
It is a class IB antiarrhythmic which shorten the refractory period and action potential duration (APD). Decrease in APD more than that of ERP so there is increase ERP/APD ratio. [3] The drug has a bioavailability of 90%, and peak plasma concentrations are seen after 2–4 hours. [3] The mean drug half-life is approximately 11 hours. [3]
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