ALB and acute myocardial infarction: Free-text keywords included variations such as "myocardial infarction," "heart attack," "acute myocardial infarction," "AMI," "lactate-to-albumin ratio," "lactate/albumin ratio," "LAR," "serum lactate," "serum albumin," "mortality," "death," "survival," "prognosis," "predictive value," and "risk stratification." Boolean operators (AND, OR) were used to combine terms appropriately.