Left atrial dyssynchrony assessed by strain imaging in predicting future development of atrial fibrillation in...

Area of Science:

• Cardiology
• Electrophysiology
• Heart Failure Research

Background:

• The risk factors for new-onset atrial fibrillation (AF) in patients with congestive heart failure (CHF) require further comprehensive investigation.
• Left atrial (LA) function, specifically lengthening and contraction patterns, has not been fully explored as a predictor of AF in this population.

Purpose of the Study:

• To investigate whether dyssynchronous LA lengthening and contraction predict the future development of new-onset AF in patients diagnosed with CHF.
• To identify key echocardiographic parameters associated with AF risk in CHF patients.

Main Methods:

• Echocardiographic assessment of 158 CHF patients without prior AF, measuring time to peak velocity and strain in LA walls relative to the QRS complex.
• Definition of atrial dyssynchrony as the standard deviation of measured parameters for LA lengthening and contraction.
• Utilized univariate and multivariate Cox regression analyses to identify predictors of new-onset AF.

Main Results:

• New-onset AF occurred in 13.3% of patients over a mean follow-up of 43 months.
• Univariate analysis revealed age, LA size/volume, reduced LA fractional shortening, and atrial dyssynchrony as associated with AF.
• Multivariate analysis identified atrial dyssynchrony based on strain (>39 ms, HR 10.0) and LA size (≥45 mm, HR 4.3) as independent predictors of new-onset AF.

Conclusions:

• Atrial dyssynchrony, particularly when assessed by LA strain, is the most significant predictor of new-onset AF in hospitalized CHF patients.
• LA size is also an independent predictor of AF development in this cohort.
• These findings highlight the importance of evaluating atrial mechanics for AF risk stratification in CHF.