Design of a New Risk Score in Critical Limb Ischaemia: The ERICVA Model

Area of Science:

• Vascular Surgery
• Medical Decision Making
• Biostatistics

Background:

• Critical lower limb ischemia (CLI) poses challenges in identifying patients who will benefit from revascularization.
• Objective risk assessment is crucial for informed clinical decisions in CLI management.

Purpose of the Study:

• To develop and validate a novel risk score, ERICVA (Evaluation of Risk in Critical limb Vascular intervention Assessment), for predicting adverse outcomes in CLI patients.
• To compare the predictive performance of the ERICVA score against established risk stratification tools, PREVENT III and Finnvasc.

Main Methods:

• An observational retrospective study included 672 patients undergoing revascularization for CLI.
• A multivariate Cox regression analysis identified key predictors of death and/or major amputation.
• The ERICVA score was developed and validated, with its predictive accuracy assessed using receiver operating characteristic (ROC) curve analysis (Area Under the Curve - AUC).

Main Results:

• The ERICVA score incorporated variables such as cerebrovascular disease, prior amputation, diabetes, dialysis, COPD, cancer, low hematocrit, high neutrophil/lymphocyte ratio, absent ankle Doppler signal, emergency admission, and Rutherford stage 6.
• In the development sample, ERICVA showed significantly higher AUC than PREVENT III and Finnvasc.
• In the validation sample, ERICVA also demonstrated significantly superior AUC compared to Finnvasc.

Conclusions:

• The ERICVA risk score exhibits strong predictive capacity for death and/or major amputation in patients with critical lower limb ischemia.
• The ERICVA model offers improved predictive accuracy over the PREVENT III and Finnvasc scores, enhancing clinical decision-making for revascularization procedures.