Brizuela Sanz et al developed the ERICVA model for critical limb ischemia. The parameters with the highest scores were separated to produce a simplified score. The authors are from Hospital Clinica Universitario, University of Vallalodid in Spain.
ERICVA is derived from Escala de Riesgo en Isquemia Critica de Valladolid
Patient selection: critical limb ischemia, Rutherford class 4 to 6
Parameters:
(1) dialysis
(2) active cancer within the past 5 years
(3) hematocrit in percent
(4) neutrophil to lymphocyte ratio
(5) Rutherford class
neutrophil to lymphocyte ratio =
= (absolute neutrophil count per µL) / (absolute lymphocyte count per µL)
|
Parameter |
Finding |
Points |
|
dialysis |
no |
0 |
|
|
yes |
1 |
|
active cancer |
no |
0 |
|
|
yes |
1 |
|
hematocrit |
>= 30% |
0 |
|
|
< 30% |
1 |
|
neutrophil to lymphocyte ratio |
<= 5 |
0 |
|
|
> 5 |
1 |
|
Rutherford class |
4 or 5 |
0 |
|
|
6 |
1 |
total score =
= SUM(points for all 5 parameters)
Interpretation:
• minimum score: 0
• maximum score: 5
• The higher the score the greater the risk.
|
Total Score |
Risk Level |
5-Year Survival |
|
0 |
low |
59% |
|
1 |
medium |
31% |
|
2 to 5 |
high |
9% |
Performance:
• The area under the ROC curve was 0.68 for the development set and 0.76 for the validation set.
Specialty: Cardiology
