Recommendations	Grade	Level of evidence	Key references
6.3	Estimate periprocedural risk and life expectancy in patients with CLTI who are candidates for revascularization.	1 (Strong)	C (Low)	Biancari,63 2007 Schanzer,64 2008 Bradbury,65 2010 Meltzer,66 2013 Simons,67 2016
6.4	Define a CLTI patient as average surgical risk when anticipated periprocedural mortality is <5% and estimated 2-year survival is >50%.	2 (Weak)	C (Low)
6.5	Define a CLTI patient as high surgical risk when anticipated periprocedural mortality is ≥5% or estimated 2-year survival is ≤50%.	2 (Weak)	C (Low)