Management of Atrial Fibrillation with Rapid Ventricular Response in Right Ventricular Dysfunction

Preferred Agents for Rate Control

• The American College of Cardiology recommends that in patients with right ventricular dysfunction and atrial fibrillation with rapid ventricular response, esmolol is the preferred agent over diltiazem because non-dihydropyridine calcium channel blockers like diltiazem have negative inotropic effects that can worsen heart failure 1, 2, 3
• The American Heart Association and the European Heart Society suggest that beta-blockers are the preferred agents for achieving rate control in patients with systolic dysfunction unless otherwise contraindicated 1
• The European Heart Society notes that intravenous esmolol is particularly useful in states of high adrenergic tone and provides rapid, titratable rate control with a short half-life 4, 3

Rationale for Avoiding Diltiazem

• The European Heart Journal states that diltiazem and verapamil should be used cautiously or avoided in patients with heart failure due to systolic dysfunction because of their negative inotropic properties that can precipitate or worsen hemodynamic compromise 4, 2, 3
• The American College of Cardiology guidelines explicitly state that nondihydropyridine calcium antagonists such as diltiazem should be used with caution in those with depressed ejection fraction because of their negative inotropic effect 1

Dosing Strategy for Esmolol

• The European Heart Journal recommends an initial loading dose of 500 mcg/kg IV over 1 minute, followed by continuous infusion starting at 50 mcg/kg/min 4
• The European Heart Journal suggests titrating infusion by 50 mcg/kg/min every 4-5 minutes as needed for rate control, up to a maximum of 200 mcg/kg/min 4

Critical Caveats

• The American Heart Association advises that beta-blockers should be initiated cautiously in patients with heart failure who have reduced ejection fraction, starting with low doses and careful hemodynamic monitoring 2, 3
• The European Heart Journal notes that if the patient is hemodynamically unstable, immediate electrical cardioversion should be performed rather than pharmacological rate control 3