Serum total antioxidant capacity during the first week of sepsis and mortality.

PURPOSE: Higher circulating total antioxidant capacity (TAC) concentrations have been found in non-survivor than in survivor septic patients at moment of sepsis diagnosis. The objectives of this study were to determine whether serum TAC levels during the first week of sepsis are associated with lipid peroxidation, sepsis severity, and sepsis mortality, and whether could be used as a prognostic biomarker. METHODS: This prospective and observational study with 319 septic patients admitted to Intensive Care Units was carried out in 8 Spanish hospitals. We determined serum concentrations of malondialdehyde (to estimate lipid peroxidation) and TAC at days 1, 4 and 8 of sepsis. Mortality at 30 days was the end-point study. RESULTS: We found that serum TAC concentrations at days 1, 4 and 8 could predict 30-day mortality according to ROC curve analyses (p < 0.001), that were associated with 30-day mortality according to regression analyses (p < 0.001), and that were associated with serum levels of malondialdehyde and SOFA score. CONCLUSIONS: The new findings of our study were that serum TAC levels during the first week of sepsis are associated with lipid peroxidation, sepsis severity, and sepsis mortality, and that could be used as a prognostic biomarker.

Serum melatonin levels during the first seven days of severe sepsis diagnosis are associated with sepsis severity and mortality.

OBJECTIVE: Higher serum melatonin levels have previously been found in patients with severe sepsis who died within 30 days of diagnosis than in survivors. The objective of our study were to determine whether serum melatonin levels during the first seven days of severe sepsis diagnosis could be associated with sepsis severity and mortality. METHODS: Multicentre study in eight Spanish Intensive Care Units which enrolled 308 patients with severe sepsis. We determined serum levels of melatonin, malondialdehyde (as biomarker of lipid peroxidation) and tumor necrosis factor-alpha at days 1, 4 and 8 of severe sepsis diagnosis. The study's primary endpoint was 30-day mortality. RESULTS: A total of 103 patients had died and 205 survived at 30 days of severe sepsis diagnosis, with the non-survivors presenting higher serum melatonin levels at days 1 (p<0.001), 4 (p<0.001) and 8 (p<0.001) of severe sepsis diagnosis than the survivor patient group. The multiple logistic regression analysis found that serum melatonin levels at days 1, 4 and 8 of severe sepsis diagnosis (p<0.001, p=0.01 and p=0.001, respectively) were associated with mortality adjusted for age, serum lactic acid, SOFA score and diabetes mellitus. CONCLUSIONS: The novel and more interesting findings of our study were that serum melatonin levels during the first seven days of severe sepsis diagnosis are associated with sepsis severity and mortality.

Higher serum caspase-cleaved cytokeratin-18 levels during the first week of sepsis diagnosis in non-survivor patients.

BACKGROUND: Caspase-cleaved cytokeratin (CCCK)-18 is a protein released into the blood during apoptosis. Higher circulating CCCK-18 concentrations have been found in non-survivor than in survivor septic patients at moment of sepsis diagnosis. The following questions arise now: (1) How are serum CCCK-18 levels during the first week of sepsis? (2) Is there an association between sepsis severity and mortality and serum CCCK-18 levels during the first week? The aims of this study were to answer these questions. METHODS: Multicenter study with 321 severe septic patients from eight Spanish intensive care units. We determined serum concentration of CCCK-18, tumor necrosis factor (TNF)-α, and interleukin (IL)-10 during the first week. Our end-point study was 30-day mortality. RESULTS: Non-survivor (n=108) compared to survivor patients (n=213) showed higher serum CCCK-18 levels at days 1, 4 and 8 (p<0.001). ROC curve analyses showed that serum CCCK-18 levels at days 1 (AUC=0.77; 95% CI=0.72-0.82), 4 (AUC=0.81; 95% CI=0.76-0.85) and 8 (AUC=0.83; 95% CI=0.78-0.88) could predict mortality at 30 days (p<0.001). Logistic regression analyses showed that serum CCCK-18 levels at days 1 (OR=4.367; 95% CI=2.491-7.659), 4 (OR=10.137; 95% CI=4.741-21.678) and 8 (OR=8.781; 95% CI=3.626-21.268) were associated with 30-day mortality (p<0.001). We found a positive correlation between CCCK-18, SOFA, and lactic acid at days 1, 4 and 8. CONCLUSIONS: Non-survivor septic patients showed persistently during the first week higher serum CCCK-18 levels than survivor patients, and there is an association between sepsis severity and mortality and serum CCCK-18 levels during the first week.