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A Serum sodium concentration (Na) and PaO2/FiO2 ratio (P/F ratio) at admission in patients with serum IL-6 level <10 and >10 pg/mL; B Inverse correlation between serum IL-6 level (IL-6) and serum sodium concentration (Na); C Direct correlation between serum sodium concentration (Na) and PaO2/FiO2 ratio (P/F ratio) at admission; D Comparison between serum sodium concentration (Na) at admission and after 48 hours in patients with hyponatremia, treated or not (control) with tocilizumab
