Basic Science of Venous Ulcers: Mechanisms and Evidence Gaps

Mechanisms of Venous Ulcer Genesis

Shear stress on the endothelium triggers glycocalyx shedding and leukocyte adhesion, while iron overload from hemosiderin breakdown drives oxidative stress and the damaging molecule peroxynitrite, and cytokine profiles differ between healing and non-healing ulcers.

Varicose Vein Endothelial Dysfunction

Endothelial cells from incompetent veins show reduced junctional proteins and phenotypic switching under disturbed shear stress, with gene expression and metabolomic studies showing inflammatory activation that increases with higher CEAP stage, and early data suggesting statins may reduce smooth muscle activation.

Evidence Gaps in Venous Ulcer Treatment

A gap analysis of randomized trials found superficial vein ablation improves venous leg ulcer healing and recurrence in ESCHAR and EVRA, but perforator treatment, deep venous disease, and outflow obstruction stenting still lack well powered controlled trials to guide practice.

Panel Discussion on Recalcitrant Ulcers

Panelists debated iron toxicity thresholds, lymphatic dysfunction in the contralateral limb, macrophage phenotype switching between tissue destruction and repair, and treating obesity as a metabolic rather than mechanical driver of poor healing in patients with BMI above 40.