NPPA and congestive heart failure: The missing correlation of NEFA with NT-proBNP levels, which were not significant before or after TAVI and lack of sex-specific changes after TAVI suggest that sex-specific differences in NEFA may not be explained by a direct link to natriuretic peptides in the present study, a link which has been established for men in chronic heart failure and after ANP infusion [30,31].