Deng X, et al. - In 426 consecutive ST-elevation myocardial infarction (STEMI) patients treated with primary percutaneous coronary intervention (P-PCI), researchers examined the link between eosinophil-to-monocyte ratio (EMR) on admission and one-month and long-term all-cause mortality. Patients were categorized in terms of tertiles of EMR on admission between September 2015 and October 2017. Findings demonstrated an independent correlation between EMR on admission and 1-month and long-term all-cause mortality in STEMI patients undergoing P-PCI. For risk stratification of STEMI patients, this indicates that EMR is a possible simple, valuable, and inexpensive index.