Input EBL, lowest MAP, and lowest HR to assess surgical insult.
Guidelines & Evidence
Clinical Details
Section 1
When to Use
When to Use
Immediately at the conclusion of any general, vascular, or colorectal surgical procedure.
Identifying patients at high risk for 30-day major complications or death despite favorable preoperative risk assessments.
Aiding in objective postoperative triage (e.g., intensive care/HDU vs. regular ward).
Section 2
Formula & Logic
Scoring Variables
Estimated Blood Loss (EBL): Routine operative measurement.
Lowest Intraoperative MAP: Calculated from cuff or arterial line.
Lowest Intraoperative HR: Includes an automatic 0 for pathologic bradyarrhythmias.
Interpretation (Gawande et al.)
Score ranges from 0 to 10. A score of ≤ 4 indicates High Risk (major complication or death). 5-7 is Medium Risk, and 8-10 is Low Risk.
Section 3
Pearls/Pitfalls
Performance in Colorectal Surgery
Unlike CR-POSSUM which relies heavily on preoperative and physiological data, the SAS measures intraoperative trajectory. It naturally adjusts for surgical skill, unexpected bleeding, and anesthetic challenges.
Pinho et al. demonstrated that while CR-POSSUM has superior overall discrimination for ICU allocation (AUC 0.78), SAS (AUC 0.67) provides immediate, highly specific insight into surgical insult without needing complex labs.
A low SAS (≤ 4) combined with a high CR-POSSUM score signifies extreme risk and strongly mandates ICU admission.
Section 4
Next Steps
Clinical Action Plan
Score ≤ 4: Consider immediate ICU or HDU transfer. Heightened vigilance for bleeding and end-organ dysfunction (AKI, ischemia).
Score 5-7: Standard pathway, but hold a low threshold for escalation if clinical status changes.
Score 8-10: Routine postoperative ward care. Expected to have favorable outcomes.
Section 5
Evidence Appraisal
Primary References
An Apgar score for surgery.
Gawande AA et al. • J Am Coll Surg. 2007;[https://pubmed.ncbi.nlm.nih.gov/17261463/](https://pubmed.ncbi.nlm.nih.gov/17261463/)
CR-POSSUM and Surgical Apgar Score as predictive factors for patients’ allocation after colorectal surgery.
Pinho S et al. • Braz J Anesthesiol (English Edition). 2018;[https://doi.org/10.1016/j.bjane.2018.01.006](https://doi.org/10.1016/j.bjane.2018.01.006)
