an increasing trendP < 0.001
When grouped by the Killip class, the plasma levels of TMAO in patients with Killip I–IV were 6.4 (IQR 3.8–11.3), 9.2 (IQR 4.6–13.9), 10.5 (IQR 5.5–18.1), and 13.4 (IQR 6.1–23.3) μmol/L, respectively, showing an increasing trend ( P < 0.001).