NPPB and heart failure: Nt-Pro BNP levels, markers of heart failure severity, were slightly higher in the over-median KCCQ group (3374.91 ± 2111.29 pg/mL) compared to the under-median group (3229.50 ± 1711.35 pg/mL), though both groups had elevated levels, reflecting the overall severity of heart failure in the cohort.