Structure
Tocainide hydrochloride is an amide-type antiarrhythmic agent structurally related to procainamide. It features a diethylaminoethyl side chain attached to a 2,6-dimethyl-p-aminobenzoic acid core.
Chemical Formula: C₁₀H₁₅N₃O₂S·HCl
Mode of Action
Class IA Antiarrhythmic: Blocks fast sodium channels, prolongs action potential duration and refractory period.
Potassium Channel Blockade: Extends repolarization by inhibiting potassium efflux.
Effect on Heart Rate: Converts atrial fibrillation to sinus rhythm and prevents reentrant arrhythmias.
Faster Onset: Compared to procainamide, tocainide has a more rapid onset of action.
Uses of Tocainide hydrochloride
Ventricular Arrhythmias: Treats ventricular tachycardia and ventricular fibrillation.
Atrial Arrhythmias: Manages atrial fibrillation and atrial flutter.
Reentrant Arrhythmias Prevention: Effective in preventing recurrence post-cardiac events.
Antiarrhythmic Prophylaxis: Used after myocardial infarction to prevent arrhythmias.