Mechanism
Inflammation generates H₂O₂. Venous hypertension allows RBC leakage and subsequent iron release. Iron in the ferrous state catalyzes:
Fe²⁺ + H₂O₂ → Fe³⁺ + OH⁻ + OH
The hydroxyl radical (OH) is short-lived but highly destructive—precisely the kind of injury pattern that perpetuates chronicity.
Pathophysiologic consequences relevant to healing
Endothelial damage and microvascular dysfunction
ECM breakdown and protease imbalance
Impaired fibroblast function and keratinocyte migration
Inflammatory phase “lock-in” despite adequate topical care
Critical thinking
The brown hemosiderin halo around a VLU is not just a venous sign. It frequently indicates iron deposition and ongoing oxidative stress, which can slow closure even when compression is correct.
This is why iron modulation (chelation agents) continues to be explored as an adjunct—never a substitute—for compression and fundamentals.
Indicative Ref
Ukaegbu K, Allen E, Svoboda KKH. I Reactive Oxygen Species and Antioxidants in Wound Healing: Mechanisms and Therapeutic Potential. Int Wound J. 2025 May;22(5):e70330. doi: 10.1111/iwj.70330. PMID: 40288766; PMCID: PMC12034374.
Harding, K., Queen, D., & Nelson, A. (2014). An overview of the relationship between anaemia, iron, and venous leg ulcers. Wounds UK, 10(1), 1-8.
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