Pilsicainide

An article about the antiarrhythmic medication Pilsicainide

Overview

Chemical structure of Pilsicainide

Pilsicainide is a class Ic antiarrhythmic agent used primarily in the management of cardiac arrhythmias. It is known for its ability to block sodium channels, thereby affecting the cardiac action potential and stabilizing the cardiac rhythm.

Pharmacology

Pilsicainide works by inhibiting the fast sodium channels in the cardiac myocytes. This action results in a decrease in the rate of rise of the action potential, which prolongs the refractory period and reduces the excitability of the cardiac tissue. As a result, it is effective in treating supraventricular tachycardia and certain types of ventricular arrhythmias.

Mechanism of Action

The primary mechanism of action of pilsicainide involves the blockade of the fast inward sodium current (INa) during phase 0 of the cardiac action potential. This blockade leads to a reduction in the conduction velocity of the cardiac impulse, particularly in the atria and ventricles, which helps to prevent the re-entry circuits that can cause arrhythmias.

Clinical Use

Pilsicainide is used in the treatment of various types of arrhythmias, including:

• Atrial fibrillation
• Atrial flutter
• Paroxysmal supraventricular tachycardia

It is often administered orally and is known for its relatively selective action on cardiac tissue, with minimal effects on other tissues.

Side Effects

Common side effects of pilsicainide include:

• Dizziness
• Nausea
• Fatigue

In some cases, it may cause proarrhythmic effects, particularly in patients with structural heart disease or significant left ventricular dysfunction.

Contraindications

Pilsicainide is contraindicated in patients with:

• Severe heart failure
• Significant bradycardia
• Second-degree atrioventricular block or higher without a pacemaker

Related pages

• Antiarrhythmic agent
• Cardiac arrhythmia
• Sodium channel blocker