Epidemiologic Study of Systemic Inflammatory Response Syndrome in Emergency Department

ABSTRACT

PURPOSE: Epidemiologic data on emergency department (ED) patients with systemic inflammatory response syndrome (SIRS) are limited. We examined the prevalence, risk factors, etiologies and outcomes for the various forms of the SIRS, as well as their relationships with infection in ED. METHODS: The subjects were 16,718 non-trauma adult patients who visited a 900- bed university hospital ED between November 2006 and October 2007. ED records were reviewed, and all patients meeting the criteria for SIRS were enrolled retrospectively. SIRS patients were further subdivided into four groups (non-infectious SIRS, sepsis, severe sepsis, septic shock). Baseline characteristics, ED dispositions, and prognoses of patients in each group were analyzed. RESULTS: Among 16,718 patients, there were 2,790 SIRS patients (16.7%). The SIRS patient group was composed of 1,546 non-infectious SIRS patients (55.4%), 1,078 sepsis patients (38.6%), 119 severe sepsis patients (4.3%), and 47 septic shock patients (1.7%). ED patients with SIRS were older on average than non-SIRS patients (52 versus 48, p<0.001). The most common sources of SIRS was the gastrointestinal system (28.3%), followed by the respiratory system (22.9%) and the genitourinary system (11.8%). Pneumonia (18.9%) was the single most common cause of infectious SIRS. The admission rate was higher for SIRS patients than for non-SIRS patients (44% versus 21%). The 28-day mortality rate for non-infectious SIRS, sepsis, severe sepsis, and septic shock patients were 4.5%, 1.3%, 25.2%, and 63.8%. Sepsis severity was correlated with increased rates of both hospital admission and mortality (p<0.001). CONCLUSION: 55% of SIRS patients who visited the ED had a non-infectious cause. SIRS patients were older than non-SIRS patients, and hospital and ICU admission rates were also higher. Sepsis severity was correlated with older age, increased hospital admission rate, increased ICU admission rate, and increased mortality rate.