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Thrombocytopenia in critically ill patients with sepsis or septic shock: a systematic review and meta-analysis


 Background Thrombocytopenia is a common feature of sepsis or septic shock, but few meta-analyses have specifically evaluated prognostic importance of thrombocytopenia in patients with sepsis or septic shock. The objective of this meta-analysis was to evaluate the prognosis of thrombocytopenia in critically ill patients with sepsis or septic shock.Methods We searched the PubMed, Cochrane, and Embase databases for studies from inception to the 30th of November 2019. Prospective or retrospective cohort studies comparing thrombocytopenia to no thrombocytopenia in critically ill patients with sepsis or septic shock were included. All authors reported our primary outcome of short-term mortality(defined as ICU or 48-hour mortality) with clinically relevant secondary outcomes(ICU length of stay, rate of AKI, rate of mechanical ventilation). Results were expressed as odds ratio (OR) and mean difference (MD) with accompanying 95% confidence interval (CI).Results Seven studies including 4243 patients were included. The results of this meta-analysis showed that the short-term mortality of thrombocytopenia group was higher than that of the no thrombocytopenia group (odds ratio [OR]=2.01;95% CI, 1.73-2.33; P<0.00001; I2=78%).In addition, compared with no thrombocytopenia group, thrombocytopenia group showed higher rate of AKI(odds ratio [OR]=1.31;95% CI, 1.03-1.66; P=0.03 I2=65%) and longer ICU length of stay(Mean difference=1.31;95% CI, 0.66-1.96; P<0.0001; I2=50%). There was no statistically significant difference in the rate of mechanical ventilation between 2 groups (odds ratio [OR]=1.24;95% CI, 0.82-1.88; P=0.30; I2=0%).Conclusions Thrombocytopenia was associated with increased short-term mortality, ICU length of stay and rate of AKI in critically ill patients with sepsis or septic shock. The analysis of secondary outcomes showed no significant difference in the rate of mechanical ventilation between the two groups. Further randomized controlled studies of thrombocytopenia are still required.