We analyzed population with AF. Both subgroups were similar with regard to demographic characteristics, cardiovascular risk factors, and anticoagulant therapy. The absence of difference in anticoagulation status resulted from the duration of AF and the previous implementation of treatment. We noticed many significant differences in standard and advanced echo measurements. The low or absent correlations between LA conventional and STE parameters may suggest that LA deformation has many determinants (25).  Clinical and standard echocardiographic factors associated with LAAT To evaluate the diagnostic value of clinical **data** for the identification of the higher risk of LAAT we used the CH 2 ADS 2 -VASc Score-a well-established and validated scale stratifying stroke risk in AF (1). Higher values of this score has been also reported in the patients with LAAT (26). In our study, despite comparable CH 2 ADS 2 -VASc Score values in both subgroups (with and without LAAT), the score was statistically significant univariate factor of LAAT. Contrary to earlier reports our analysis did not confirm significant meaning of more sustained AF forms for thrombus formation (27). It may be hypothesized that high prevalence of risk factors (85% patients had at least the CH 2 ADS 2 -VASc Score equal 2) and sustained forms of AF in our study group was the reason for this lack of significant differences.