ARISCAT Postoperative Pulmonary Complication Score Calculator

Overview

Estimates risk of postoperative pulmonary complications from seven preoperative and procedural factors.

Clinical Significance

Commonly used classes are low risk below 26 points, intermediate risk 26–44, and high risk 45 or more. Absolute event rates vary between cohorts and definitions of postoperative pulmonary complication.

When to Use

• Use when the patient and clinical question match the population and purpose described.
• Use accurate current inputs and preserve the original score definitions.

How It Is Calculated

• Seven weighted factors are summed: age, preoperative SpO₂, respiratory infection in the previous month, haemoglobin ≤10 g/dL, incision site, expected duration and emergency status.

Interpretation

• Commonly used classes are low risk below 26 points, intermediate risk 26–44, and high risk 45 or more. Absolute event rates vary between cohorts and definitions of postoperative pulmonary complication.

Worked Example

Enter a complete, clinically consistent set of values. MedicalC then applies the published method: Seven weighted factors are summed: age, preoperative SpO₂, respiratory infection in the previous month, haemoglobin ≤10 g/dL, incision site, expected duration and emergency status.

Patient Considerations

• Developed in a broad surgical cohort in Catalonia. External performance varies by geography, surgical mix, minimally invasive practice, perioperative pathways and outcome definition.

Limitations

• The score does not replace clinical judgement, preoperative optimisation or procedure-specific assessment. Oxygen saturation may be affected by supplemental oxygen, altitude and acute instability.
• Performance and calibration may differ outside the derivation and validation settings.
• The result supports but does not replace clinical assessment, investigation or local guidance.

Clinical Pearls

• ARISCAT is most useful when it prompts a concrete perioperative mitigation plan rather than merely documenting a risk label.
• Document component values as well as the final result.

Common Mistakes

• Using an incorrect threshold, unit or category definition.
• Applying the tool to a population for which it has not been validated.
• Treating the calculated category as a diagnosis or automatic treatment instruction.

Evidence Base

Canet J et al. Prediction of postoperative pulmonary complications in a population-based surgical cohort. Anesthesiology. 2010;113:1338–1350.

References

1. Canet J et al. Prediction of postoperative pulmonary complications in a population-based surgical cohort. Anesthesiology. 2010;113:1338–1350. — Primary or authoritative source supporting the implemented method.