Blood Interleukin-6 Levels Predict Multiple Organ Dysfunction in Critically Ill Patients

Area of Science:

• Critical Care Medicine
• Biomarker Discovery
• Clinical Outcomes Research

Background:

• Predicting multiple organ dysfunction (MOD) in late-stage critical illness is crucial for patient management.
• Cytokines are potential biomarkers for clinical outcomes, but their role in late-phase MOD prediction was unclear.
• This study investigated cytokine predictive value for late-phase MOD.

Purpose of the Study:

• To identify the biomarker with the highest predictive value for late-phase multiple organ dysfunction (MOD) in critically ill patients.
• To evaluate the predictive performance of seven blood biomarkers for early- and late-phase MOD.
• To determine if IL-6 levels can predict MOD development at different time points.

Main Methods:

• An observational study involving 174 adult patients in intensive care units across five tertiary hospitals.
• Measured seven blood biomarkers including interleukin-6 (IL-6), IL-8, IL-10, tumor-necrosis factor-α, white blood cells, C-reactive protein, and procalcitonin at days 0, 1, and 2.
• Utilized the area under the receiver operating characteristic curve (AUC) to assess predictive values for MOD on day 3 (early) and day 7 (late).

Main Results:

• Blood interleukin-6 (IL-6) levels demonstrated the highest predictive value for MOD on day 7 (late-phase) using single timepoint data (AUC 0.825).
• Using data from three timepoints, IL-6 remained the strongest predictor for MOD on day 7 (AUC 0.838) and day 3 (early-phase, AUC 0.836).
• IL-6 consistently outperformed other tested biomarkers in predicting both early and late-phase MOD.

Conclusions:

• Blood IL-6 levels are the most valuable biomarker for predicting MOD in critically ill patients, applicable to both early and late phases.
• IL-6 measurement, particularly using serial data, offers significant predictive power for MOD development.
• These findings highlight IL-6 as a key predictor for managing critically ill patients at risk of multiple organ dysfunction.