AHSG and cardiac arrhythmia: Fetuin-A levels were significantly higher in TTC patients suffering an arrhythmia during hospitalization, compared to TTC patients without arrythmias (median: 217.2 μg/mL, IQR: 206.4–226.1 μg/mL vs. median: 200.6 μg/mL, IQR: 187.8–211.3 μg/mL; p = 0.007).