Introduction: Sepsis and septic shock are medical emergencies that require immediate recognition and management. In order to stratify the severity of septic patients, it is necessary to have simple and rapid The modified shock index (MSI) considers valuable information related to cardiovascular and hemodynamic stability by integrating heart rate and mean blood pressure makes it an inclusive tool in the evaluation of septic patients. Objective: To determine the usefulness of the modified shock index as a predictor of mortality in septic patients at ICU admission. Methodology: Retrospective From January 01 to June 30, 2021, all patients admitted to intensive therapy under the diagnosis of sepsis from different sites were included. MSI values, epidemiological variables and site of infection were recorded at admission to intensive care unit.\ Results: 50 patients were analyzed where 52% had a modified shock index > 1.3, which when compared with the clinical characteristics, it was observed that the predominant gender was female with 28% p value 416, arterial hypertension with the 26% p value 0.170 was the predominant comorbidity, in terms of the site of infection, the lung with 22% p value 0.046 was the clinical characteristics with statistical significance since its p value < 0.05. The mean days of stay in the ICU was 5.65, 42% of patients with an index > 1.3 ended up dying, p value <0.001 Conclusion: In our study, the patients with modified shock index greater than 3 ended up dying mostly.