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Published on: September 22, 2020
Chronic Limb-Threatening Ischemia in Patients with Type 2 Diabetes: Revascularization Index as a Predictor for
Nawaf J Shatnawi1, Nabil A Al-Zoubi1, Lujain A Al-Bakkar1
1Department of Surgery, Jordan University of Science and Technology, Irbid, Jordan.
Insights
A new Revascularization Index (RI) effectively predicts outcomes for patients with type 2 diabetes and chronic limb-threatening ischemia undergoing endovascular intervention. Lower RI scores indicate a higher risk of major amputation and need for secondary revascularization.
Area of Science:
- Vascular Surgery
- Diabetology
- Interventional Radiology
Background:
- Chronic limb-threatening ischemia (CLTI) in diabetic patients carries a high risk of adverse outcomes.
- Complexities in diabetic CLTI management include comorbidities, varied foot presentations, and diffuse atherosclerotic lesions.
- Existing scoring systems and revascularization strategies aim to optimize outcomes.
Purpose of the Study:
- Introduce a novel Revascularization Index (RI).
- Evaluate the predictive capability of the RI for outcomes following primary endovascular intervention in type 2 diabetes patients with CLTI.
Main Methods:
- Retrospective review of electronic medical records for 187 patients with type 2 diabetes and CLTI.
- Patients underwent primary endovascular interventions between January 2014 and August 2019.
- Analysis of the RI's predictive value for secondary revascularization, major amputation, and mortality.
Main Results:
- The study included 187 patients, with a 19.3% major lower limb amputation rate.
- The RI demonstrated excellent prediction for secondary revascularization (AUC=0.80) and good prediction for major amputation (AUC=0.76).
- An RI <1.21 significantly correlated with increased major lower limb amputation risk (HR=5.8), and RI <1.3 predicted higher secondary revascularization needs.
Conclusions:
- The Revascularization Index (RI) can predict major adverse lower limb events (MALE) in diabetic CLTI patients.
- The RI may serve as a valuable tool to guide the extent of endovascular interventions.
- This index is particularly relevant for managing diabetic CLTI with multi-level outflow atherosclerotic disease.
Purpose:
Chronic limb-threatening ischemia in patients with diabetes is associated with a high risk of adverse outcomes. The associated co-morbidities, the heterogeneity of foot presentation and the distribution of atherosclerotic lesions led to the emergence of multiple revascularization strategies and scoring systems to improve management outcomes. This study aimed to introduce a new index, the revascularization index (RI), and to assess its predictive value for the outcomes of primary endovascular intervention in patients with type 2 diabetes presenting with chronic limb-threatening ischemia.
Patients And Methods:
A retrospective electronic medical records review was conducted for patients with type 2 diabetes presenting with chronic limb-threatening ischemia managed at King Abdullah University Hospital by primary endovascular interventions between January 2014 and August 2019. The RI was analyzed for its predictive value for the treatment outcomes.
Results:
A total of 187 patients were included in this study, with a major lower limb amputation rate of 19.3%. The performance of the RI was excellent in predicting secondary revascularization (AUC = 0.80, 95% CI: 0.73-0.86, p-value < 0.001), good to predict major amputation (AUC = 0.76, 95% CI: 0.67-0.85, p-value = 0.047), and poor in predicting death (AUC = 0.46, 95% CI: 0.40-0.55, p-value = 0.398). RI of <1.21 was significantly associated with a higher risk of major lower limb amputation (HR = 5.8, 95% CI: 1.25-26.97, p-value < 0.025), and RI of < 1.3 was associated with a higher risk for secondary revascularization.
Conclusion:
The RI can be used to predict major adverse lower limb events (MALE). It might be used as a guide for the extent of endovascular interventions for diabetic chronic limb-threatening ischemia with multi-level outflow atherosclerotic disease.
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