P325Incremental value of left atrial strain in predicting atrial fibrillation in heart failure with preserved ejection fraction

Abstract

Atrial fibrillation (AF) is a frequent comorbidity in heart failure with preserved ejection fraction (HFpEF), worsening the clinical course. Although various contributors to the development of AF have been identified, effective screening strategies to prevent this arrhythmia are ill-defined. Aim To investigate the factors associated with incident AF in a well-characterized HFpEF population, with special focus on left atrial (LA) strain. Methods 170 pts with symptomatic HFpEF (mean age 65±8 yrs), free of baseline AF, underwent clinical evaluation, echocardiography and cardiopulmonary exercise testing. AF was diagnosed by clinical review, standard ECG, and single lead portable ECG monitoring. Results Over a median follow-up of 49 months, incident AF was identified in 39/170 pts (23%). Pts who developed AF were older, had higher clinical risk scores, BNP, creatinine, LA volume index (LAVI), LV mass, lower LA strain, exercise capacity, and more impaired LV diastolic function. The highest areas under ROC curves for AF prediction were for peak-atrial contraction strain (PACS; 0.76), total peak-atrial longitudinal strain (PALS; 0.71) and LAVI (0.72). Nested Cox regression models showed that the predictive value of LA strain was independent from and incremental to clinical data, LAVI and E/e' ratio estimating LV filling pressure (Figure). Addition of total PALS to the model including CHA2DS2VASc score, LAVI and E/e' improved classification by 37% (p=0.04), and subsequent addition of PACS improved classification by 54% (p=0.003). Figure 1 Conclusions LA strain, especially PACS, provides incremental predictive information about incident AF in HFpEF. The inclusion of LA strain to the diagnostic algorithm may help guide screening for AF risk in this population.