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STS Score (Aortic or Mitral or Combined) Calculator

  • Age (years)
  • Sex (1=Male, 0=Female)
  • NYHA Class (1–4)
  • EF (% Left Ventricular Ejection Fraction)
  • Creatinine (mg/dL)
  • Diabetes (1=Yes, 0=No)
  • Previous Cardiac Surgery (1=Yes, 0=No)
  • Operative Priority (1=Elective, 2=Urgent, 3=Emergent)
  • STS Score (Aortic/Mitral/Combined): Explanation and Clinical Context
    The Society of Thoracic Surgeons (STS) risk score is a validated tool to predict operative mortality and morbidity for patients undergoing cardiac surgery, including aortic valve replacement, mitral valve surgery, or combined procedures.
    The score incorporates multiple patient-specific variables such as age, sex, NYHA class, left ventricular ejection fraction (EF), creatinine level, diabetes status, prior cardiac surgery, and operative priority to estimate perioperative risk.
    Predicted risk helps clinicians in preoperative counseling, risk stratification, and decision-making for surgical versus transcatheter interventions.
    While this calculator provides an approximate STS score using a simplified logistic model, exact risk calculation requires the official STS Adult Cardiac Surgery Risk Calculator, which includes over 40 variables for precise risk estimation.

    Reference:
    O'Brien SM, et al. The Society of Thoracic Surgeons 2008 Cardiac Surgery Risk Models: Part 2—Valve Plus Coronary Artery Bypass Graft Surgery. Ann Thorac Surg. 2009;88(1 Suppl):S23–S42. doi:10.1016/j.athoracsur.2009.03.077