Clinical Scorecard: Assessing the Prognostic Value of Systemic Inflammation Response Index (SIRI), Neutrophil–Lymphocyte Ratio (NLR), Derived Neutrophil–Lymphocyte Ratio (dNLR), and Systemic Immune Inflammation Index (SII) in Acute Diverticulitis Outcomes

At a Glance

Key Highlights

• Complicated acute diverticulitis (CAD) patients show significantly higher inflammatory markers (WBC, CRP, NLR, dNLR, SII, SIRI) compared to simple acute diverticulitis (SAD).
• NLR, dNLR, SIRI, and SII correlate positively with Hinchey classification severity and can serve as prognostic biomarkers.
• Use of these biomarkers may reduce unnecessary CT scans by supporting clinical and radiological diagnosis.

Guideline-Based Recommendations

Diagnosis

• Evaluate patients with suspected acute diverticulitis using history, physical exam, inflammatory markers (CRP, WBC), and abdominal CT imaging.
• Classify diverticulitis severity using Hinchey classification based on CT findings.
• Consider NLR, dNLR, SIRI, and SII as adjunctive noninvasive biomarkers to support diagnosis and severity assessment.

Management

• Outpatient medical follow-up for uncomplicated diverticulitis (Hinchey 0, 1a).
• Closer monitoring, possible interventional or surgical treatment for complicated diverticulitis (Hinchey 1b and above).
• Use inflammatory biomarker levels to guide treatment intensity and hospital stay duration.

Monitoring & Follow-up

• Monitor inflammatory markers (CRP, WBC, NLR, dNLR, SIRI, SII) to assess disease progression or response to treatment.
• Use serial measurements to identify patients at risk for complications requiring intervention.

Risks

• Unnecessary CT imaging in uncomplicated cases may be reduced by integrating biomarker assessment.
• Delayed recognition of complicated diverticulitis may increase morbidity; thus, combined clinical, radiological, and biomarker evaluation is essential.

Patient & Prescribing Data

Adult patients diagnosed with acute diverticulitis, stratified by Hinchey classification.

Patients with higher inflammatory biomarker levels (NLR, dNLR, SIRI, SII) are more likely to require surgical or interventional procedures and longer hospital stays.

Clinical Best Practices

• Incorporate NLR, dNLR, SIRI, and SII calculations from routine blood counts to aid in prognostic assessment of acute diverticulitis.
• Use the Hinchey classification in conjunction with biomarker levels to stratify patients into uncomplicated versus complicated groups for appropriate management.
• Apply ROC curve analysis and Youden index to determine optimal biomarker cut-off points for clinical decision-making.
• Exclude patients with immunosuppressive therapy or other pathologies to ensure accurate biomarker interpretation.

References

• Hinchey Classification and Modifications
• NLR as a Marker of Inflammation (Zahorec)
• Systemic Immune-Inflammation Index (SII) in Inflammation