Rationale and Methodological Approach Underlying the Development of the Sequential Organ Failure Assessment (SOFA)-2...

Area of Science:

• Critical Care Medicine
• Epidemiology
• Clinical Assessment

Background:

• The original Sequential Organ Failure Assessment (SOFA) score, published in 1996, requires revision due to significant advancements in organ support and patient outcomes over three decades.
• Current clinical practices and understanding of organ dysfunction have evolved, necessitating an updated assessment tool.

Purpose of the Study:

• To develop updated definitions of organ dysfunction reflecting current medical knowledge.
• To identify key variables for a revised SOFA score (SOFA-2) to quantify individual organ dysfunction severity.

Main Methods:

• A task force of 60 international experts in intensive care and epidemiology utilized Delphi processes and data synthesis, including systematic reviews and meta-analyses.
• Variables were defined, graded from 0 to 4, and tested for predictive validity using large datasets (3.34 million patients) from diverse settings.
• The original six organ systems were retained with updated terminology (e.g., brain, kidney, hemostasis, liver), and revisions were made to organ support variables.

Main Results:

• The SOFA-2 score retains physiological variables from the original SOFA but incorporates updated definitions and terminology for organ systems.
• Revisions to organ support variables reflect current clinical practice, with added alternative variables for low-resource settings or treatment limitations.
• Validation exercises confirmed the distribution and predictive validity (mortality) of the SOFA-2 score across diverse patient populations.

Conclusions:

• The SOFA-2 score provides updated, quantifiable criteria for assessing organ dysfunction in critically ill adult patients.
• This revised score accounts for contemporary changes in patient management and outcomes, enhancing clinical utility.
• The development process was methodologically robust, ensuring relevance and applicability in modern intensive care settings.