Clinical meaning
The TIME framework (Tissue, Infection/Inflammation, Moisture, Edge) is an evidence-based systematic approach to wound bed preparation (WBP) that addresses the molecular and cellular abnormalities preventing chronic wound healing. The T (Tissue non-viable or deficient) component addresses devitalized tissue (slough, eschar) that harbors bacteria, sustains inflammation, and physically blocks cell migration. Debridement removes this tissue and senescent cells, converting a chronic wound to an acute wound molecular environment with fresh expression of growth factors (PDGF, TGF-β, VEGF). The I (Infection or Inflammation) component recognizes that chronic wounds exist in a state of persistent inflammation with elevated pro-inflammatory cytokines (TNF-α, IL-1β), excessive matrix metalloproteinase (MMP) activity, and biofilm formation in 60-90% of chronic wounds. Topical antimicrobials (silver, cadexomer iodine, medical-grade honey) address superficial infection, while systemic antibiotics target deep tissue infection. The M (Moisture imbalance) component addresses both excessive moisture (causing maceration and MMP-laden wound fluid degrading periwound skin) and insufficient moisture (desiccating the wound bed and impeding epithelial cell migration). The E (Edge non-advancing or undermined) component identifies wounds with rolled edges (epibole), undermining, or non-migrating epithelium suggesting fibroblast senescence or undiagnosed pathology (vasculitis, malignancy). WBP is the clinical strategy of systematically addressing each TIME component to create an optimal wound bed capable of responding to advanced therapies including growth factors, skin substitutes, and negative pressure wound therapy. The NP integrates vascular assessment, nutritional optimization, glycemic control, and medication review as essential systemic components of the WBP paradigm.