Chronic limb-threatening ischemia (CLTI) — the evolution of the CLI terminology toward CLTI emphasizing its chronic nature and incorporating the full spectrum from rest pain through tissue loss — represents the paradigm shift in peripheral vascular intervention that is reshaping treatment approaches, clinical trial design, and commercial market development, with the Peripheral Intervention Market reflecting CLTI as the most clinically urgent peripheral intervention market driver.

Global Vascular Guidelines for CLTI — the 2019 multisociety Global Vascular Guidelines providing the comprehensive framework for CLTI assessment, risk stratification, and treatment including the WIfI staging system, GLASS anatomical staging, and PLAN care framework — represent the clinical standard that major vascular societies (SVS, EVS, AVF) have jointly developed to standardize CLTI management. Global Vascular Guidelines' evidence-based recommendations for revascularization timing, technique, and adjunct care define the clinical practice standards that drive the CLTI treatment market.

Angiosome-directed BTK revascularization — the clinical theory and evidence supporting targeted revascularization to the specific angiosome (anatomical arterial territory) supplying the wound to optimize tissue healing — creates the precision endovascular approach that guides BTK intervention strategy in CLTI patients with tissue loss. The emerging evidence and ongoing debate about angiosome-directed versus indirect revascularization represent an active area of clinical investigation that influences peripheral intervention device selection.

Pedal arch revascularization — the novel endovascular approach extending revascularization to the plantar arch and pedal vessels for patients with very distal tibial and pedal occlusive disease — represents the technical frontier of peripheral intervention, reaching vessels previously considered beyond endovascular capability. Dedicated micro-guidewires, micro-balloon catheters, and specialized low-profile devices enabling plantar arch access and revascularization represent the innovation at the extreme distal end of peripheral intervention.

Do you think extending peripheral intervention to pedal arch and foot vessels represents appropriate technical expansion for limb salvage or primarily prolongs intervention without substantially improving outcomes for the most distal disease patterns?

FAQ

What is the WIfI staging system for CLTI? WIfI (Wound, Ischemia, foot Infection) is a classification system developed by the Society for Vascular Surgery to standardize CLTI assessment and predict amputation risk; Wound: grades wound severity from zero (no wound/minor) to three (extensive, deep tissue loss); Ischemia: grades arterial supply from zero (ABI greater than zero-point-eight) to three (ABI less than zero-point-four); foot Infection: grades from zero (no infection) to three (severe limb-threatening infection); combination of W, I, and fI scores defines clinical stages predicting one-year amputation risk and benefit from revascularization; higher WIfI stages have greater amputation risk and potentially higher benefit from revascularization; provides standardized framework for comparing outcomes across trials and treatment centers.

What is the GLASS anatomical classification for CLTI? Global Limb Anatomic Staging System (GLASS) classifies the extent and pattern of infrapopliteal (BTK) arterial disease in CLTI patients; stratifies femoropopliteal and infrapopliteal disease separately into three stages (I-III) based on lesion length, location, and occlusion; combined femoropopliteal and infrapopliteal GLASS stages predict procedural complexity and revascularization outcomes; GLASS staging integrated with WIfI clinical staging provides comprehensive anatomical-clinical framework for predicting revascularization feasibility and outcomes; intended to guide treatment planning and risk stratification rather than mandate specific approaches; used in major CLTI clinical trials (BEST-CLI) to characterize enrolled populations.

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