NPPB and heart failure: The 6MWT has been used as a maker of frailty.26 It also appears that the 6MWT is a useful surrogate of maximum exercise capacity in patients with heart failure and preserved ejection fraction.27 Finally, recent data show that improvement in the 6MWT following TAVR is associated with better survival..28 We add to these findings by showing that post‐TAVR, a single measure of 6MWT is not necessarily sufficient as it changes over time, while closely following BNP.