Recent research has aimed to study the use of SI in patients immediately on arrival to the emergency department (ED). SI >1.0 has been widely found to predict increased risk of mortality and other markers of morbidity, such as need for massive transfusion protocol activation and admission to intensive care units.
While HR and SBP have traditionally been used to characterize shock in these patients, they often appear normal in the compensatory phase of shock and can be confounded by factors such as medications (eg, antihypertensives, beta-agonists). It has been studied in patients either at risk of or experiencing shock from a variety of causes: trauma, hemorrhage, myocardial infarction, pulmonary embolism, sepsis, and ruptured ectopic pregnancy. Erica Koch, 1 Shannon Lovett, 2 Trac Nghiem, 2 Robert A Riggs, 2 Megan A Rech 2, 3ġStritch School of Medicine, Loyola University Chicago, Maywood, IL 60153, USA 2Department of Emergency Medicine, Loyola University Medical Center, Maywood, IL 60153, USA 3Department of Pharmacy, Loyola University Medical Center, Maywood, IL 60153, USAĪbstract: Shock index (SI) is defined as the heart rate (HR) divided by systolic blood pressure (SBP).
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