Objective perfusion metrics for CLTI: toe pressure, TcPO2, skin perfusion pressure (SPP) and WIfI staging

in Vascular Diagnostics and Imaging

Applied

Type

Reinforcement

Confidence

95%

Created

Mar 19, 2026

Evidence

1 source

Rationale

The 2024 ACC/AHA/SVS PAD guidelines represent the most current consensus on CLTI management. They strongly endorse the WIfI staging system for both risk stratification (amputation risk) and revascularization benefit prediction. Integrating this citation reinforces the existing text and ensures the textbook reflects the latest clinical standards.

Evidence

Gornik HL, et al. 2024 ACC/AHA/AACVPR/APMA/ABC/SCAI/SVM/SVN/SVS/SIR/VESS Guideline for the Management of Lower Extremity Peripheral Artery Disease: A Report of the American College of Cardiology/American Heart Association Joint Committee on Clinical Practice Guidelines. Circulation. 2024. PMID: 38743805.
Verified source
PubMedDOI

Content Changes

**Objective Perfusion Metrics for chronic limb-threatening ischemia (CLTI): Toe Pressure, TcPO₂, Skin Perfusion Pressure (SPP), and Wound, Ischemia, and foot Infection (WIfI) Staging**

In patients with chronic limb-threatening ischemia (CLTI), objective perfusion measurements are essential for assessing disease severity andseverity, predicting wound healing potential.potential, and determining the risk of major amputation. [@conte2019-gvg] [@svs2024-e]

Key metrics and thresholds (per WIfI):

* **Toe pressure:** <30 mmHg indicates severe ischemia (WIfI I2–I3); 30–39 mmHg moderate (I1); ≥40 mmHg adequate (I0).
* **Transcutaneous oxygen pressure (TcPO₂):** <30 mmHg indicates severe ischemia with poor healing potential (WIfI I2–I3); 30–39 mmHg moderate (I1); ≥40 mmHg adequate perfusion favorable for wound healing (I0).
* **Skin perfusion pressure (SPP):** <30–40 mmHg indicates poor healing potential.

These perfusion parameters should be integrated into the Society for Vascular Surgery (SVS) Wound, Ischemia, and foot Infection (WIfI) staging system and applied according to Global Vascular Guidelines (GVG) recommendationsand the 2024 ACC/AHA/SVS guidelines for revascularization planning.planning and risk stratification. [@mills2014] [@conte2019-gvg] [@svs2024-e] [@potier2011] [@schepers2010] See [[Peripheral Artery Disease|Ch. 10]] for complete WIfI classification and management. [@mills2014] [@conte2019-gvg] [@potier2011] [@schepers2010]
Go to section in textbookDispute / Submit evidenceAll updates