A new pacing method for rapid regularization and rate control in atrial fibrillation

Area of Science:

• Cardiology
• Electrophysiology

Background:

• Atrial fibrillation (AF) presents challenges in rate control and hemodynamic stability.
• Current management strategies for AF may have limitations in specific patient populations.

Purpose of the Study:

• To evaluate the efficacy of right ventricular extrastimulus (intercalated pacing) for temporary rate control and hemodynamic improvement in patients with AF.
• To assess the impact of intercalated pacing on cardiac output, arterial pressures, and mitral valve hemodynamics.

Main Methods:

• Intercalated pacing involved delivering a single right ventricular extrastimulus after each sensed conducted beat in 15 patients with AF.
• Success rate, coupling interval, and ventriculoatrial conduction were measured.
• Hemodynamic parameters including heart rate, stroke volume, arterial pressures, and cardiac output were assessed.

Main Results:

• Intercalated pacing significantly reduced AF pulse rate (137 to 75 bpm) and enhanced stroke volume (28 to 44 ml).
• Improved pulse pressure, pulse-to-pulse regularity, and arterial pressure regularization were observed.
• In patients with mitral stenosis, cardiac output improved, and mitral valve gradient, pulmonary arterial, and wedge pressures decreased.

Conclusions:

• Intercalated pacing provides rapid temporary control of rate, regularity, and cardiac hemodynamics in AF.
• The benefits of intercalated pacing were more pronounced in patients with mitral stenosis and restricted left ventricular filling.