Abstract Funding Acknowledgements None. Introduction Risk stratification at admission in patients with myocardial infarction (MI) is crucial in the prognosis assessment. KAsH score is a useful and simple tool to predict in-hospital mortality. Objective To evaluate KAsH score predictive power according to gender in patients (P) who suffered MI (either STEMI or NSTEMI) Methods Based on a single-center retrospective study, data collected from P admitted in the Cardiology department with MI between 2016 and 2019. P without or uncompleted data were excluded. We compared 2 groups: Group 1 (G1) – male patients; Group 2 (G2) – female patients. Major adverse cardiac events (MACE) were defined as the composite of nonfatal stroke, nonfatal myocardial infarction and cardiovascular death. Statistical analysis used T test, chi-square, logistic regression and ROC curve analysis. Results Among the 611 P admitted with MI mean age was 66.6±12.7 years old and 64.8% were male. G1 was younger (64.7 ±12.8 years vs 64.7±12.8, p<0.001). The groups were similar regarding the other variables that compose the KAsH score, namely Killip-Kimbal class (p=0.668), systolic blood pressure (p=0.378), and heart rate (p=0.265). The mean KAsH categorization was 1.48 for G1 and 1.54 for G2 (p=0.05). The groups were also similar regarding other (CV) factors namely arterial hypertension, diabetes mellitus, dyslipidaemia, smoking and previous MI. In general, KAsH score was able to predict in-hospital mortality in our sample p=0.03, OR 2.45, CI 1.09-5.55 but with poor accuracy (AUC 0.355). However, the score did not predict 1 year mortality (p=0.337) or 1 year readmission (p=0.943). Regarding the groups, KAsH score did not predict in-hospital mortality for G1 (p=0.465) but it did predict the occurrence of MACE events, p=0.01, OR 2.20, CI 1.20-4.09, AUC 0.634. Considering G2 KAsH score predicted in-hospital mortality p=0.02, OR 4.10, CI 1.24-13.87 but with poor accuracy (AUC 0.211). It also predicted the occurrence of MACE events p=0.001, OR 4.61, CI 1.83-11.63 with fair accuracy (AUC 0.77). Such as in G1 the score did not predict 1 year mortality or readmission (p=0.178) Conclusion In our center, KAsH score performed better in female patients in predicting in-hospital mortality and MACE events. The score also predicted MACE events in male patients, but did not predict in-hospital mortality. More studies are needed to validate additional variables to the score and to validate KAsH score as a long-term prognostic tool.