Electrophysiological Features of Atrial Flutter Development in Patients With Atrial Fibrillation

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Arrhythmias

Background:

• Atrial flutter (AFL) is a common tachyarrhythmia often occurring with atrial fibrillation (AF).
• Limited research exists on factors predicting AFL incidence in AF patients undergoing pulmonary vein isolation.
• Understanding AFL development is crucial for effective arrhythmia management.

Purpose of the Study:

• To investigate electrophysiological and structural features associated with AFL development in patients with AF.
• To identify predictors of AFL incidence in AF patients undergoing ablation.

Main Methods:

• Analysis of 91 patients undergoing AF ablation.
• Pre-ablation structural evaluation using echocardiography and CT scans.
• Electrophysiological assessment of cavotricuspid isthmus (CTI) decrement evoked potential (DEEP) via extra-stimulus pacing from tricuspid annulus (TA) and coronary sinus (CS).

Main Results:

• A significant difference in CTI DEEP incidence was observed between AFL+ and AFL- groups (p<0.001).
• Tricuspid annulus pacing-induced DEEP (TA DEEP) was significantly associated with higher AFL incidence (AFL+ 69% vs. AFL- 11%, p<0.001).
• Multivariate analysis identified TA DEEP as an independent predictor of AFL incidence (OR: 1.08; 95% CI: 1.04-1.12; p<0.001).

Conclusions:

• Electrophysiological evaluation of atrial DEEP at the CTI is significantly related to the presence of AFL in AF patients.
• TA DEEP is the sole independent predictor for identifying concomitant AFL in AF patients.
• These findings enhance understanding of AFL pathophysiology and prediction in AF.