C4A and congestive heart failure: The variables significantly related to 90-day mortality were age; trauma patients; emergency surgery other than trauma patients; the APACHE II score; SOFA score; chronic heart failure; chronic liver disease; immunosuppression; CRP; PCT; CD3+; CD4+; CD8+ T cells; C3; C4; albumin; prealbumin; transferrin; FT3; FT4; and TSH.