Surgical Apgar Score
Intraoperative 10-point score for 30-day major complications or death
Sources last checked: 2026-10-13
Surgical Apgar Score
Intraoperative 10-point score for 30-day major complications or death
Uses the lowest values during the operation, so drug-induced bradycardia (β-blockers) earns points. Discrimination is moderate (c ≈ 0.7); it was proposed as an end-of-case flag for patients at higher risk, not as a stand-alone prognosis.
Interpretation
| 0–4 — high risk | 58.6 % had a major complication or died within 30 days in the general/vascular validation cohort (Gawande 2007). |
|---|---|
| 5–6 | Intermediate risk; complication rates fall stepwise with each band. |
| 7–8 | Around the median score; lower intermediate risk. |
| 9–10 — low risk | 3.6 % major complication or death in the validation cohort. |
What is the Surgical Apgar Score?
The Surgical Apgar Score rates three intraoperative measures — estimated blood loss, lowest mean arterial pressure and lowest heart rate — on a 0–10 scale. Gawande and colleagues derived it in 2007 in colectomy patients in Boston and validated it in general and vascular surgery. Low scores identify patients at high risk of major complications or death within 30 days.
When to use it
- At the end of an operation, to flag patients at higher risk of major complications
- Communicating intraoperative course at handover
- Surgical quality monitoring
When not to use it
- As the only prognostic tool — it ignores preoperative risk
- Cardiac surgery and paediatric surgery, where it was not derived
How it is calculated
| Criterion | Points |
|---|---|
| Estimated blood loss | |
| > 1000 mL | 0 |
| 601–1000 mL | 1 |
| 101–600 mL | 2 |
| ≤ 100 mL | 3 |
| Lowest mean arterial pressure | |
| < 40 mmHg | 0 |
| 40–54 mmHg | 1 |
| 55–69 mmHg | 2 |
| ≥ 70 mmHg | 3 |
| Lowest heart rate | |
| > 85 /min | 0 |
| 76–85 /min | 1 |
| 66–75 /min | 2 |
| 56–65 /min | 3 |
| ≤ 55 /min | 4 |
Clinical pearls and limitations
- Uses the lowest values during the operation, so drug-induced bradycardia (β-blockers) earns points. Discrimination is moderate (c ≈ 0.7); it was proposed as an end-of-case flag for patients at higher risk, not as a stand-alone prognosis.
- A lower heart rate earns more points; pathological bradyarrhythmias score 0.
- Preoperative β-blockade can raise the score without reflecting lower risk.
- Validated internationally (including the WHO checklist cohort across eight countries), with moderate discrimination.
Frequently asked questions
What is a bad Surgical Apgar Score?
4 or less: in Gawande's validation cohort 58.6 % of such patients had a major complication or died within 30 days.
Which parameters make up the Surgical Apgar Score?
Estimated blood loss, lowest mean arterial pressure and lowest heart rate during surgery.
Why does a low heart rate give more points?
It was an empirical finding in the derivation data: lower intraoperative heart rates were associated with fewer complications. Tachycardia may reflect hypovolaemia or stress, but the score does not test the mechanism.
Evidence and guidelines
- Primary source: Gawande AA, Kwaan MR, Regenbogen SE, Lipsitz SA, Zinner MJ. An Apgar score for surgery. J Am Coll Surg 2007;204(2):201-208. Points table as reprinted in Wuerz et al., Clin Orthop Relat Res 2011 (PMC3048275).
- Regenbogen SE et al. Utility of the surgical apgar score: validation in 4119 patients. Arch Surg 2009;144(1):30-36 (score ≤ 4: 56 % major complications; 9–10: 5 %).
- Haynes AB et al. Surgical outcome measurement for a global patient population: validation of the Surgical Apgar Score in 8 countries. Surgery 2011;149(4):519-524.
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