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The challenge and importance of defining critical limb ischemia
1Department of Medicine and Physiology, University of Manitoba, Winnipeg, Canada.
Insights
Critical limb ischemia (CLI) poses significant risks, including limb loss and high mortality. Hemodynamic criteria are proposed for a reliable definition of CLI and subcritical ischemia to improve disease understanding and treatment assessment.
Area of Science:
- Vascular Surgery
- Cardiovascular Medicine
- Medical Diagnostics
Background:
- Critical limb ischemia (CLI) is associated with high rates of limb loss, cardiovascular events, and mortality.
- Existing risk factors for atherosclerosis do not fully explain the severity of CLI outcomes.
- A standardized definition is crucial for understanding CLI's natural history and evaluating therapies.
Purpose of the Study:
- To explore challenges in defining critical ischemia.
- To propose modified hemodynamic definitions for critical and subcritical ischemia.
Main Methods:
- Review of difficulties in establishing a universally accepted definition for critical ischemia.
- Development of modified definitions based on hemodynamic criteria.
- Inclusion of pressure measurements and microcirculation indices.
Main Results:
- Clinical manifestations and outcomes are unreliable for defining critical ischemia.
- Hemodynamic criteria are essential for accurate assessment.
- Proposed modified definitions for critical and subcritical ischemia.
Conclusions:
- A precise, hemodynamically based definition is needed for critical limb ischemia.
- The proposed definitions incorporate pressure and microcirculation data.
- These definitions aim to improve the study and treatment of CLI.
Abstract:
Patients with critical limb ischemia are at risk of limb loss and have very high cardiovascular and total mortality rates, which are greater than can be accounted for by the usual risk factors for atherosclerosis. A definition of critical ischemia is necessary to determine the natural history of the disease and to assess and compare the efficacy of various forms of therapy. The definition needs to be based on hemodynamic criteria because clinical manifestations and outcomes are not reliable. The reasons for the difficulties in arriving at a generally acceptable definition are explored. Building on the previous work of others, modified hemodynamic definitions for critical and subcritical ischemia, which include measurements of pressures and of indices of microcirculation, are proposed.