Sequential Versus Non-Sequential Polymyxin B Hemoperfusion in Severe Sepsis and Septic Shock: A Real-World Cohort Analysis of Survival in an Asian ICU.

Background

Severe sepsis and septic shock remain major causes of ICU mortality despite advances in critical care. Polymyxin B hemoperfusion (PMX-HP) is widely used in Asia for refractory endotoxemia, yet the optimal session strategy remains unclear.

Methods

We retrospectively analyzed adult ICU patients with severe sepsis or septic shock treated with PMX-HP between 2013 and 2019 in a tertiary center in Taiwan. Patients were divided into sequential (≥2 sessions within 24 h) and non-sequential groups. The primary outcome was 28-day mortality; secondary outcomes included ICU and hospital mortality, length of stay, organ support, and vasoactive-inotropic score (VIS) changes.

Results

Among 64 patients, 33 (51.6%) received sequential therapy. The 28-day mortality was 46.9%, with no difference between groups after adjustment for baseline severity. Patients receiving sequential PMX-HP had longer hospital stays and more frequent CRRT use, likely reflecting greater underlying disease severity rather than a causal effect of treatment sequencing.

Conclusions

Multivariate analysis identified higher APACHE II score, positive VIS change, and CRRT requirement as independent predictors of mortality. Sequential therapy itself was not associated with improved outcomes. Prognosis in PMX-HP-treated patients is determined mainly by underlying severity and hemodynamic instability, underscoring the need for patient selection and biomarker-guided strategies rather than routine sequential use.