Surgical Risk Calculator

Infrainguinal Bypass Surgery Perioperative Mortality Risk Calculator

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Estimates 30-day mortality after elective infrainguinal bypass surgery.

Actual age in years, 1 to 110
COPD Chronic obstructive pulmonary disease
Corticosteroid use Preoperative chronic corticosteroid use
Dialysis Preoperative dialysis dependence
Preoperative functional status
Preoperative SIRS Preoperative SIRS (systemic inflammatory response syndrome)SIRS is clinically recognized by the presence of two or more of the following within the same time frame: Temp >38 degrees C or <36 degrees C; HR >90 bpm; RR >20 breaths/min or PaCO2 <32 mmHg (<4.3 kPa); WBC >12,000 cell/mm3, <4000 cells/mm3, or >10% immature (band) forms; Anion gap acidosis: this is defined by either: [Na + K] – [CL + HCO3 (or serum CO2)]. If this number is greater than 16, then an anion gap acidosis is present. Na – [CL + HCO3 (or serum CO2)]. If this number is greater than 12, then an anion gap acidosis is present.
Rest pain Preoperative rest pain in lower extremity

About this model

  • Built from 9,556 patients in the 2007–2009 American College of Surgeons National Surgical Quality Improvement Program (NSQIP), with internal validation by bootstrapping.
  • 30-day mortality was 1.8%.
  • C statistic 0.81 (bias-corrected 0.81).

Citation

Gupta PK, Ramanan B, Lynch TG, Sundaram A, MacTaggart JN, Gupta H, Fang X, Pipinos II. Development and validation of a risk calculator for prediction of mortality after infrainguinal bypass surgery. J Vasc Surg. 2012;56(2):372-9. doi:10.1016/j.jvs.2012.01.042 · PubMed 22632800

Original spreadsheet

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