image by: HWN

HWN Suggests

Concept of the five ‘A's for treating emergency arrhythmias

For acute therapy, we will present the new concept of the five ‘A's, which refers to adenosine, adrenaline, ajmaline, amiodarone, and atropine. Additionally, there are the ‘B,’ ‘C,’ and ‘D’ strategies, which refer to beta-blockers, cardioversion, and defibrillation, respectively. The five ‘A’ concept allows a safe and effective antiarrhythmic treatment of all bradycardias, tachycardias, SVTs, VT, ventricular flutter, and ventricular fibrillation, as well as of asystole.

read full article

Featured

 Classification of antiarrhythmic agents

One might occasionally hear it being referred to as the "Vaughan and Williams" or "Vaughan-Williams" classification, which is, of course, inaccurate because it is named after Miles Vaughan Williams, the celebrated pharmacologist and ninety-year-old fitness guru. His classification system was first presented in April of 1970, at the Symposium on Cardiac Arrhythmias in Elsinore, Denmark (yes, that Elsinore).

Articles of Interest

Antiarrhythmic Agents

Indications of, and mechanism of action for, the various classes of antiarrhythmic drugs...

Antiarrhythmic drugs in acute ventricular arrhythmias (ventricular tachycardia, ventricular fibrillation)

Antiarrhythmic drugs affect the function of cardiac ion channels. These agents are classified according to the Singh–Vaughan Williams classification (Table 1). Agents in bold text are commonly used to prevent or treat acute and subacute ventricular arrhythmias.

Antiarrhythmic Drugs in Atrial Fibrillation: Is There Still a Role for Rhythm Control?

Despite the fact that AFFIRM and other studies failed to show any apparent benefit from an antiarrhythmic drug-based rhythm control strategy, the lure of sinus rhythm continues to influence practice in the United States, where one or more attempts to restore and maintain sinus rhythm are often implemented before “giving up” and accepting a rate control strategy.

Antiarrhythmic drugs in broad complex tachycardia

Procainamide Dosage: 20-30 mg per minute by intravenous infusion to a maximum dose of 1g. (Usually no more than 500 mg is required) Stop loading infusion if the dysrhythmia is controlled, the QRS widens by more than 50%, the QT becomes prolonged, or the maximum dose has been given. If VT is successfully treated, infuse at 2 - 6 mg/min to maintain the suppression

Delayed and indirect effects of antiarrhythmic drugs in reducing sudden cardiac death

Antiarrhythmic drugs (AADs) can be used for acute or chronic therapy to prevent ventricular arrhythmias and SCD

Pharm 101: Antiarrhythmic Agents

Vaughan-Williams classification (four classes). Drugs may have multiple classes of action e.g. amiodarone shares all four classes of action. Certain agents do not fit this classification scheme: Adenosine, Magnesium.

Phenytoin: an old but effective antiarrhythmic agent for the suppression of ventricular tachycardia

Although used as an AAD from the 1950s to the 1970s, phenytoin has become obsolete in recent decades due to the arrival of newer and less toxic agents.

Practical compendium of antiarrhythmic drugs: a clinical consensus statement of the European Heart Rhythm Association of the European Society of Cardiology

The compendium highlights persistent challenges in arrhythmia treatment, including clinical constraints, procedural risks, and the complexity of certain arrhythmias. Notably, atrial fibrillation is highly prevalent, and the demand for invasive treatment often surpasses the capacity of existing healthcare systems. As a result, pharmacological management remains essential.

Ten Pearls for the Use of Antiarrhythmic Drugs for Atrial Fibrillation

In general, AADs should not be started during/following the first AF episode, unless the symptoms are so dramatic that a recurrence could threaten mortality or rapid hospitalization.

Resources

StatPearls

The antiarrhythmic medications have typically been categorized according to the Vaughan-Williams (VW) classification system. The system classifies the medications according to the main mechanism of action (although several of the agents retain properties from multiple classes).