s

Baseline iCa<1.13 mmol/L (n=36) Baseline iCa ≥ 1.13 mmol/L (n=220) P Age, years 60.55±8.67 61.19±11.19 0.69 CRP after 24 h, mg/L 13 (4-23) 9 (4-18) 0.23 Symptoms to balloon, min 197 (145-262) 209 (150-287) 0.21 Baseline TnI, μg/L 1.40 (0.25-3.92) 0.18 (0.05-1.35) 0.0018 Peak TnI,μg/L 79.0 (18.0-186.5) 64.87 (19.0-114.4) 0.27 Lactate,mmol/L 1.95 (1.25-2.95) 1.80 (1.30-2.4) 0.48 LVEF, % 45.93±9.92 48.68±9.70 0.16 Baseline creatinine, µmol/L 103.0 (81.5-108.0) 96.0 (87.0-108.0) 0.66 One-month mortality, n (%) 1 (2.8) 3 (1.4) 0.46 Twelve-month mortality, n (%) 2 (5.6) 7 (3.2) 0.62

Table 1: Characteristics of the study participants relative to baseline ionized calcium (iCa) levels. Data are presented as mean ± standard deviation or median (interquartile range), unless otherwise indicated. The P for differences between the groups was calculated using the Student’s t test, Kruskal-Wallis test and Fisher’s exact test. Bolded values indicate statistical significance. CRP: C-Reactive Protein; LVEF: Left Ventricular Ejection Fraction; TnI: Troponin I.