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Abstract
Introduction: Severe sepsis is the major cause of mortality in intensive care units (ICUs). The BOOST study (= B (Belgian) OO (Open Label) ST (Study)) is a Belgian open-label trial designed to pragmatically assess the safety and efficacy of Drotrecogin Alfa (activated) (DAA), the only registered treatment in this indication with favourable ratio benefit/risk.
Methodology:Adult patients with severe sepsis and 2 or more sepsis-induced organ dysfunctions (OD) within the 48-hour period preceding the treatment (DAA at 24µg/kg/h for 96 hours), were included between January 2003 and October 2003. Platelet count <30 000/mm3 and increased risk for bleeding were exclusion criteria. Mortality and location were evaluated at 28 and 90 days.
Results:Of the 100 included patients, 97 (median age: 66 years; men/women: 57/40) were treated and completed the study. The predominant infection sites were lung (49%) and abdomen (29%) and 35% had had recent surgery. The mean and median numbers of OD were 3.4 and 3.0, respectively, and most patients (80 %; 77/97) had 3 or more organ failures at baseline, predominantly respiratory (95%) and cardiovascular (87%). The mean APACHE II score was 25.3 (range: 6-53).
The 28-day mortality rate was 32.0% (90% CI: 24.2-39.7) and increased with the number of OD: from 15 % (1.9-28.1) for 2 ODs, to 71% (52.4-88.8) for 5 ODs. At day 28, the 66 surviving patients were located in general ward (35%), in the ICU (32%) or at home (30%). The 90-day mortality rate was 42% (90% CI: 34.0-50.5), with most of the survivors (73%) staying at home.
Eight serious adverse events, including 4 bleedings, were reported between study days 2 and 5, in 5 patients (5.2%) and led to death in 2 patients (2.1%).
Conclusion: Despite a higher severity of illness at baseline, this phase IV open-label long-term study in Belgian ICUs shows consistent results with previous studies with DAA. Importantly, most of the surviving patients at day 90 were staying at home.