Correlations between left atrial strain and left atrial pressures values in patients undergoing atrial fibrillation ablation.

ABSTRACT

BACKGROUND: We aimed to investigate the correlations between left atrial strain (LAS) assessed by speckle tracking echocardiography and directly measured left atrial pressures (LAP) values and to estimate the features of patients with lower LAS values. METHODS: A prospective, observational study was performed on patients with atrial fibrillation (AF) undergoing ablation. Detailed transthoracic echocardiography with the speckle tracking method was used to estimate the LAS reservoir (LASr) and direct measurements of LAP during ablation in all patients. RESULTS: A total of 172 patients were included (98 with sinus rhythm [SR] and 74 with AF). The patients with lower LASr (first tercile) compared to those with higher (third tercile), were older, more often female, presented with a larger left atrium (LA) (per the LA area and volume index), and had more impaired left ventricular (LV) diastolic function parameters (e', E/e'). The correlation analysis of the echocardiographic parameters with the LAP revealed the most significant correlations in the SR group, where the E/e' ratio, LASr, and LAS contraction (LASct) values were all associated with LAP. The cut-off value of LASr estimating high elevated mean LAP (≥15 mm Hg) was 21.88 (Area Under Curve [AUC], 0.81; 95% confidence interval [CI], 0.72-0.90; P <0.0001) for the SR group and 11.25 (AUC, 0.66; 95% CI, 0.53-0.80; P = 0.016) for the AF group. CONCLUSIONS: AF patients with lower LASr are older, more often female, have a larger LA, and have more impaired LV diastolic function. Low LASr and LASct and high E/e' ratio values are associated with higher LAP in AF patients with SR.