Answer: WIfI is a classification for threatened lower limbs. It provides the likelihood of morbidity in at-risk limbs. It was developed by the Society for Vascular Surgery. It stands for Wound/Ischemia/Foot Infection (WIfI). It is a score based classification assigned on a "none/mild/moderate/severe basis on the scale of 0 to 3. It has been validated through several studies.
This classification recommends to put diabetic and nondiabetic patients in separate categories and the presence or absence of neuropathy be additionally noted in patients with diabetes.
Classification can be accessed in a link given in reference # 4.
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References:
1. Armstrong DG, Mills JL. Juggling risk to reduce amputations: The three-ring circus of infection, ischemia and tissue loss-dominant conditions. Wound Medicine 2013; 1:13.
2. Zhan LX, Branco BC, Armstrong DG, et al. The Society for Vascular Surgery lower extremity threatened limb classification system based on Wound, Ischemia, and foot Infection (WIfI) correlates with risk of major amputation and time to wound healing. Journal of Vascular Surgery 2015; 61:939.
3. Mills JL Sr, Conte MS, Armstrong DG, et al. The Society for Vascular Surgery Lower Extremity Threatened Limb Classification System: risk stratification based on wound, ischemia, and foot infection (WIfI). Journal of Vascular Surgery 2014; 59:220.
4. Darling JD, McCallum JC, Soden PA, et al. Predictive ability of the Society for Vascular Surgery Wound, Ischemia, and foot Infection (WIfI) classification system after first-time lower extremity revascularizations. J Vasc Surg. 2017;65(3):695‐704. doi:10.1016/j.jvs.2016.09.055 Weblink: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5328924/
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