Abstract

Background
Shock Index (SI) is a ratio calculated to weigh Heart rate and Systolic Blood Pressure (SBP) differently. As we know increased the SI over 0.9 is a early predictor of circulatory failure induced by hypovolemia. This study was designed to evaluate the SI as a value of prognostic factor in Hemmorrhagic Shock and Septic Shock patients. Methods: From March 2001 to February 2002, patients presenting to the Emergency department with post traumatic hemorrhagic shock and septic shock patients. Exclusion criteria were age less than 15 years, cardiopulmonary arrest and death on arrival. We compared with admission days, ICU periods, survival rate, Revised trauma score, Base excess, and total amounts of transfusion for evaluation of reliability. Two groups were identified by the SI: group1 had an SI of more than 0.9, and group2 had an SI of less than 0.9. Results: There were 29 hemmorrhagic shock patients, and 30 septic shock patiens. In hemmorrhagic shock, group 1 had significantly higher value of compared items (p<0.05). In septic shock, the value were not significantly different between group1 and group 2 (p> 0.05). Conclusion: The SI may be useful to evaluate acute hemodynamic status induced by hypovolemia. But the SI cannot be useful to evaluate hemodynamic status induced by multiorgan dysfunction. The SI cannot be a predictor of prognosis in septic shock.

• Keywords: Shock index, Hemorrhagic shock, Septic shock.