EuroSCORE II Calculator

How to Use This Calculator

1. Enter all 18 EuroSCORE II variables across the patient, cardiac, and operation tabs.
2. Predicted in-hospital mortality (%) and risk category update automatically.
3. Use the professional tier for TAVI threshold and heart team recommendations.
4. Always confirm inputs with the official EuroSCORE II website for clinical documentation.

Formula

Example

Frequently Asked Questions

• What is EuroSCORE II and how does it differ from the original EuroSCORE? ▼
  EuroSCORE II is the second generation of the European System for Cardiac Operative Risk Evaluation, published by Nashef et al. in the European Journal of Cardio-Thoracic Surgery in 2012. The original additive EuroSCORE (1999) and logistic EuroSCORE (2003) were developed from European cardiac surgery data in the 1990s and became widely used for predicting in-hospital mortality, but they were known to overestimate risk in high-risk patients and underestimate risk in some lower-risk subgroups as contemporary outcomes improved. EuroSCORE II was derived from a prospective multicenter European study of over 22,000 adult patients undergoing cardiac surgery in 2010-2011. It uses a logistic regression model with 18 variables grouped into patient-related factors (age, sex, renal function, extracardiac arteriopathy, poor mobility, prior cardiac surgery, chronic lung disease, active endocarditis, critical preoperative state, diabetes on insulin), cardiac-related factors (NYHA class, CCS class 4 angina, LV function, recent MI, pulmonary hypertension), and operation-related factors (urgency, weight of procedure, surgery on thoracic aorta). The output is a predicted probability of in-hospital mortality expressed as a percentage. EuroSCORE II substantially better calibrates risk across the risk spectrum compared to its predecessors.
• What are the three EuroSCORE II risk tiers and what do they mean? ▼
  EuroSCORE II predicted in-hospital mortality is commonly interpreted in three risk tiers. Low risk (predicted mortality less than 2%) represents patients with minimal surgical risk, where conventional cardiac surgery is expected to carry a very low mortality. The vast majority of elective isolated CABG procedures in younger patients with preserved LV function fall in this category, with observed mortality typically below 1% at experienced centers. Medium risk (predicted mortality 2% to 5%) represents patients with moderate surgical risk, where both conventional surgery and transcatheter alternatives (where applicable) merit heart team discussion. High risk (predicted mortality greater than 5%) represents patients with substantially elevated surgical risk, where the benefit-risk balance of conventional surgery must be carefully weighed. For patients undergoing aortic valve replacement, European Society of Cardiology guidelines recommend that a predicted EuroSCORE II of 4% or greater should prompt heart team evaluation to consider transcatheter aortic valve implantation (TAVI) as an alternative to surgical aortic valve replacement (SAVR). At EuroSCORE II 8% or higher, TAVI is often preferred over SAVR in patients with suitable anatomy. These thresholds are incorporated into major European and ACC/AHA valvular heart disease guidelines.
• How is EuroSCORE II used in TAVI vs SAVR decision-making? ▼
  EuroSCORE II plays a central role in the Heart Team's decision between transcatheter aortic valve implantation (TAVI) and surgical aortic valve replacement (SAVR) for patients with severe aortic stenosis. The 2021 ESC/EACTS Guidelines for the Management of Valvular Heart Disease recommend TAVI for patients with elevated surgical risk defined as EuroSCORE II 4% or greater, or the presence of frailty or severe comorbidities not fully captured by the score. For patients with EuroSCORE II below 4%, SAVR remains the preferred approach in patients with suitable anatomy and life expectancy greater than one year. In the United States, the ACC/AHA Valvular Heart Disease guidelines use the STS score rather than EuroSCORE II as the primary risk metric, defining high risk as STS predicted mortality 8% or greater. It is important to recognize that no risk score perfectly captures all determinants of outcome — frailty, porcelain aorta, previous radiation, hostile chest anatomy, and patient preference are critical inputs into the heart team decision that are not reflected in numerical risk scores alone. EuroSCORE II is a starting point, not a final answer.
• What are the limitations and known calibration issues of EuroSCORE II? ▼
  Despite being a major improvement over its predecessors, EuroSCORE II has several limitations that users must appreciate. First, calibration varies across different populations and institution types — studies from high-volume specialized centers often show better actual outcomes than predicted, while community hospitals may experience closer alignment or even higher-than-predicted mortality. Second, EuroSCORE II was derived from a European population in 2010-2011 and may not perfectly reflect contemporary outcomes in other regions or with newer surgical techniques and perioperative management. Third, several important risk factors are not captured by the model, including frailty (a major independent predictor), liver disease beyond renal function, nutritional status, anemia, and chronic obstructive pulmonary disease severity. Fourth, the model has known limitations for specific procedures such as transcatheter valve interventions, complex redo surgeries, and structural heart disease procedures that go beyond conventional CABG or valve surgery. Fifth, EuroSCORE II can underestimate risk in elderly, very high-risk patients (observed vs. predicted discordance). For any specific patient, EuroSCORE II should be used as one tool among several, supplemented by clinical judgment and institutional performance data.
• How are critical preoperative state and extracardiac arteriopathy defined in EuroSCORE II? ▼
  Critical preoperative state is one of the highest-weighted variables in EuroSCORE II, contributing approximately 1.10 to the logit, and it must be defined precisely to avoid overscoring. The EuroSCORE II definition requires any one of the following: ventricular tachycardia or ventricular fibrillation or resuscitated sudden death immediately before surgery; preoperative cardiac massage; preoperative ventilation before arrival in the anesthesia room; preoperative inotropic support; intra-aortic balloon counterpulsation or ventricular assist device before surgery; preoperative acute renal failure (anuria or oliguria less than 10 mL per hour); or the combination of pre-existing conditions making surgery a salvage operation. This is strictly an acute status — chronic conditions alone do not qualify. Extracardiac arteriopathy is also precisely defined as one or more of: claudication, carotid occlusion or greater than 50% stenosis, previous or planned intervention on the abdominal aorta, limb arteries, or carotids. Asymptomatic carotid atherosclerosis discovered on imaging that does not meet these anatomical thresholds does not qualify. Using these definitions accurately is critical for score validity, as misclassification of either variable can substantially change the predicted mortality.

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