FNDC5 and medical procedure: The levels of irisin significantly (p = 0.05) increased in the patients without kidney-related events (Δ% = +5.3%, from 6.72 ng/mL [25–75% IQR = 5.17–8.10 ng/mL] to 7.10 ng/mL [25–75% IQR = 5.90–8.50 ng/mL], p = 0.05), whereas in those with kidney-related events, the levels of the biomarker decreased up to 21.9% (from 4.23 ng/mL; 25–75% IQR = 3.22–5.98 ng/mL to 3.30 ng/mL [25–75% IQR = 2.10–4.56 ng/mL]) with statistical significance (p = 0.042).