Early sepsis bundle compliance for non-hypotensive patients with intermediate versus severe hyperlactemia

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Abstract

Objective

To compare the association of 3-h sepsis bundle compliance with hospital mortality in non-hypotensive sepsis patients with intermediate versus severe hyperlactemia.

Methods

This was a cohort study of all non-hypotensive, hyperlactemic sepsis patients captured in a prospective quality-improvement database, treated October 2014 to September 2015 at five tertiary-care centers. We defined sepsis as 1) infection, 2) ≥ 2 SIRS criteria, and 3) ≥ 1 organ dysfunction criterion. “Time-zero” was the first time a patient met all sepsis criteria. Inclusion criteria: systolic blood pressure > 90 mmHg, mean arterial pressure > 65 mmHg, and serum lactate ≥ 2.2 mmol/L. Primary exposures: 1) intermediate(2.2–3.9 mmol/L) versus severe(≥ 4.0 mmol/L) hyperlactemia and 2) full 3-h bundle compliance. Bundle elements:

Methods

The primary outcome was 60-day in-hospital mortality.

Results

2417 patients met inclusion criteria. 704(29%) had lactate ≥ 4.0 mmol/L versus 1775 patients with lactate 2.2–3.9 mmol/L. Compliance was 75% for antibiotics and 53% for fluids. Full-compliance was comparable between lactate groups (n = 200(29%) and 488(28%), respectively). We observed 424(17.5%) mortalities: intermediate/non-compliant – 182(14.9%), intermediate/compliant – 41(8.4%), severe/non-compliant – 147(29.2%), severe/compliant – 54(27.0%) [difference-of-differences = 4.3%, CI = 2.6–5.9%]. In multivariable regression, mortality predictors included severe hyperlactemia (OR = 1.99, CI = 1.51–2.63) and bundle compliance (OR = 0.62, CI = 0.42–0.90), and their interaction was significant: p(interaction) = 0.022.

Conclusion

We observed a significant interaction between 3-h bundle compliance and initial hyperlactemia. Bundle compliance may be associated with greater mortality benefit for non-hypotensive sepsis patients with less severe hyperlactemia.

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