6.1 Wound Assessment, Healing Physiology & the TIME Framework
Key Takeaways
- Wound healing progresses through four continuous, overlapping physiological phases: hemostasis, inflammation, proliferation (granulation, contraction, epithelialisation), and maturation/remodelling.
- Healing occurs by primary intention (approximated edges, minimal scar), secondary intention (cavity healing via granulation from base upwards), or tertiary intention (delayed primary closure).
- Systemic impairments—specifically poorly controlled diabetes mellitus, hypoalbuminaemia (<30 g/L), systemic corticosteroids, and vascular insufficiency—substantially retard fibroplasia and angiogenesis.
- The TIME framework (Tissue, Infection/Inflammation, Moisture balance, Edge advancement) standardises clinical assessment to target specific physiological barriers to healing in Irish tissue viability practice.
- Local wound infection is identified through spreading erythema (>2 cm), purulent or malodorous exudate, increasing pain, and friable hypergranulation, requiring differentiation from systemic sepsis.
Last updated: September 2026
5.1 Wound Assessment, Healing Physiology & the TIME Framework
In Irish healthcare facilities, tissue viability and wound management are foundational components of general nursing practice. Governed by standards from the Nursing and Midwifery Board of Ireland (NMBI), the Health Service Executive (HSE), and the European Wound Management Association (EWMA), clinical wound care requires a rigorous understanding of cellular repair physiology, systematic wound bed assessment, and proactive identification of complications. In the RCSI Faculty of Nursing and Midwifery Overseas Aptitude Test, candidates are expected to demonstrate advanced diagnostic reasoning in wound evaluation, differentiate normal healing trajectories from pathological arrest, and apply standardized clinical frameworks during practical assessment stations.
[!IMPORTANT] Core Clinical Mandate in Irish Practice: Wound care is never merely a mechanical dressing change; it is an ongoing clinical assessment. Every dressing removal presents an opportunity to evaluate tissue viability, reassess the microenvironment using the TIME framework, monitor for subtle signs of deep or spreading infection, and review systemic factors influencing repair.
1. Physiology and Phases of Cutaneous Wound Healing
Wound healing is a dynamic, complex biological process classically divided into four continuous, overlapping phases: Hemostasis, Inflammatory, Proliferation, and Maturation/Remodelling. Disruption of any single phase arrests the physiological cascade, transforming an acute surgical or traumatic wound into a chronic, non-healing ulcer.
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| CONTINUUM OF CUTANEOUS WOUND HEALING |
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| PHASE 1: HEMOSTASIS (Immediate to Hours) |
| - Vasoconstriction -> Platelet aggregation -> Fibrin clot formation |
| - Degranulation releases PDGF, TGF-beta, and FGF |
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| PHASE 2: INFLAMMATORY (Day 1 to Day 4) |
| - Vasodilation & increased microvascular permeability (histamine, kinins) |
| - Neutrophil influx (24-48 h) -> Phagocytosis of bacteria & debris |
| - Monocytes transition to Macrophages (Day 2-3) -> Orchestrate debridement |
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| PHASE 3: PROLIFERATION (Day 4 to Day 21) |
| - Angiogenesis: Capillary sprout formation via VEGF |
| - Fibroplasia: Fibroblasts synthesise provisional extracellular matrix |
| - Granulation tissue: Beefy red, highly vascular bed formation |
| - Epithelialisation: Keratinocyte migration across moist wound bed |
| - Wound Contraction: Myofibroblasts pull wound margins inward |
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| PHASE 4: MATURATION & REMODELLING (Day 21 to 1-2 Years) |
| - Type III collagen replaced by organised, cross-linked Type I collagen |
| - Vascularity regresses; tensile strength increases to maximum ~80% |
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Phases of Wound Healing
| Phase | Primary Cellular Actors | Dominant Biological Events | Clinical Manifestations & Indicators |
|---|---|---|---|
| Hemostasis<br/>(Immediate – hours) | Platelets, fibrinogen, thrombin | Immediate reflexive vasoconstriction (lasting 5–10 min) followed by platelet aggregation and activation. The extrinsic and intrinsic coagulation cascades generate a fibrin mesh clot that achieves initial hemostasis. Platelet degranulation releases essential chemotactic cytokines and growth factors, including Platelet-Derived Growth Factor (PDGF), Transforming Growth Factor-beta (TGF-$\beta$), and Fibroblast Growth Factor (FGF). | Clot formation, cessation of active haemorrhage, surface desiccation forming a provisional crust/seal. |
| Inflammatory<br/>(Day 1 – Day 4) | Neutrophils, monocytes, tissue macrophages, mast cells | Mast cell histamine release induces arteriolar vasodilation and increased capillary permeability, allowing plasma exudate to enter the interstitium. Polymorphonuclear neutrophils (PMNs) arrive within 24 to 48 hours to phagocytose foreign bacteria and particulate debris. Monocytes arrive subsequently, differentiating into tissue macrophages. Macrophages are the essential orchestrators: they release proteolytic enzymes (matrix metalloproteinases [MMPs]) to digest necrotic matrix and secrete cytokines that recruit fibroblasts and endothelial cells. | Classical signs of inflammation: rubor (erythema), calor (heat), tumor (edema), dolor (pain), and functio laesa (loss of function). Moderate serosanguinous or serous exudate. |
| Proliferation<br/>(Day 4 – Day 21) | Fibroblasts, vascular endothelial cells, keratinocytes, myofibroblasts | Driven by macrophage signaling, three major events occur simultaneously:<br/>1. Angiogenesis / Neovascularisation: Capillary endothelial buds proliferate under Vascular Endothelial Growth Factor (VEGF) stimulation.<br/>2. Fibroplasia & Granulation: Fibroblasts synthesize a provisional extracellular matrix rich in Type III collagen and hyaluronic acid, producing granulation tissue.<br/>3. Epithelialisation & Contraction: Keratinocytes proliferate and migrate across the moist wound surface from wound margins and adnexal structures. Specialized myofibroblasts anchor to wound edges and contract, reducing wound surface area. | Granulation bed: beefy red, moist, glistening, cobblestone appearance. Delicate, pale pink epithelial margins advancing inward. Progressive reduction in wound surface dimensions. |
| Maturation / Remodelling<br/>(Day 21 – 1 to 2 years) | Fibroblasts, myofibroblasts | Collagen remodeling occurs as Matrix Metalloproteinases (MMPs) degrade fragile, disorganized Type III collagen, replacing it with organized, densely cross-linked bundles of Type I collagen aligned along lines of mechanical stress. Neovascular capillaries regress, and cellularity decreases. Tensile strength increases gradually: reaching approximately 20% of original strength at 3 weeks, and plateauing at a maximum of 70% to 80% of uninjured tissue strength at 12 months. Scar tissue never regains 100% of the tensile strength of intact skin. | Red, raised, vascular scar gradually softens, flattens, and pales into a white, hypopigmented, avascular, less elastic scar. |
2. Types of Wound Healing Intentions
Cutaneous wounds are categorized into three primary surgical and clinical healing intentions, dictated by tissue loss, bacterial burden, and anatomical approximation:
Comparison of Wound Healing Intentions
| Healing Intention | Mechanism & Anatomical Characteristics | Common Clinical Examples | Healing Trajectory & Complications |
|---|---|---|---|
| Primary Intention<br/>(Healing by first intention) | Wound edges are cleanly cut and immediately approximated using mechanical devices (sutures, staples, adhesive strips, or tissue glue). Minimal tissue loss; minimal gap between edges. | Elective surgical incisions (e.g., uncomplicated laparotomy, total hip replacement incision), clean traumatic lacerations closed within 6 hours. | Rapid re-epithelialisation (complete within 24 to 48 hours). Minimal formation of granulation tissue. Low infection risk (<2% in clean surgery). Minimal scarring (hairline scar). |
| Secondary Intention<br/>(Healing by second intention) | Significant loss of tissue prevents surgical edge approximation. The wound must remain open and heal from the base upwards through the progressive accumulation of extensive granulation tissue, wound contraction, and inward epithelial migration. | Pressure injuries (Category 2–4), dehisced abdominal surgical wounds, venous leg ulcers, extensive burns, excised pilonidal sinus wounds. | Extended healing timeline (weeks to months). Marked formation of granulation tissue. Increased susceptibility to colonisation and infection. High exudate levels. Healing results in significant scar contraction and tissue fibrosis. |
| Tertiary Intention<br/>(Delayed primary closure) | The wound is deliberately left open initially due to gross contamination, high bacterial bioburden, foreign material, severe tissue edema, or uncertain tissue viability. The wound is debrided, dressed with moist sterile dressings or Negative Pressure Wound Therapy (NPWT), and monitored for 3 to 5 days. Once infection has resolved and healthy granulation bed is established, edges are surgically approximated. | Contaminated traumatic crush injuries, ruptured appendicitis with peritonitis wounds, abdominal compartment syndrome incisions (laparostomy), bite wounds. | Combines advantages of secondary drainage with primary cosmetic and functional closure. Prevents deep abscess formation beneath closed skin while avoiding long secondary healing times. |
3. Factors Impairing Wound Healing
Wound repair is highly vulnerable to both systemic physiological insults and local wound microenvironmental derangements. In the RCSI examination, candidates must identify these factors to construct comprehensive care plans.
Systemic and Local Factors Impairing Wound Healing
| Factor Category | Specific Clinical Entity | Pathophysiological Mechanism | Clinical & Laboratory Indicators |
|---|---|---|---|
| Systemic: Metabolic | Diabetes Mellitus | Persistent hyperglycaemia (>11.0 mmol/L) induces non-enzymatic glycation of proteins, forming advanced glycation end-products (AGEs). This impairs neutrophil chemotaxis, blunts phagocytosis, and reduces intracellular oxidative burst killing. Concurrent diabetic microangiopathy and peripheral neuropathy lead to microvascular ischemia and unperceived mechanical trauma. | Elevated HbA1c (>53 mmol/mol or >7.0%), fluctuating capillary blood glucose, diminished monofilament sensation (10 g Semmes-Weinstein test), delayed epithelialisation. |
| Systemic: Nutritional | Protein-Calorie Malnutrition & Hypoalbuminaemia | Severe hypoalbuminaemia (<30 g/L; normal reference 35–50 g/L) reduces intravascular oncotic pressure, producing interstitial tissue edema that impairs capillary oxygen diffusion. Depletion of essential amino acids (arginine, glutamine) deprives fibroblasts of substrate required for collagen synthesis, blunting tensile strength and precipitating wound dehiscence. Vitamin C deficiency prevents prolyl/lysyl hydroxylation, while zinc deficiency arrests cellular proliferation. | Serum albumin <30 g/L, MUST score $\ge 2$, marked temporal/quadriceps muscle wasting, lack of palpable surgical healing ridge along incision by postoperative day 5 to 7. |
| Systemic: Pharmacological | Systemic Corticosteroids & Cytotoxics | High-dose corticosteroids (e.g., Prednisolone >20 mg/day) inhibit the initial inflammatory response, suppress lysosomal enzyme release, impair macrophage recruitment, and directly downregulate procollagen gene transcription. Cytotoxic chemotherapy halts cellular mitosis in both tumour cells and rapidly dividing fibroblasts and endothelial buds. | Thin, fragile skin ("tissue paper skin"), easy bruising, absent inflammatory margin, spontaneous skin tearing, surgical wound dehiscence. |
| Systemic: Perfusion | Peripheral Arterial Disease (PAD) & Smoking | Arterial occlusive disease diminishes distal capillary perfusion pressure. Cigarette smoking introduces nicotine (a potent peripheral vasoconstrictor), carbon monoxide (which binds haemoglobin with 200x the affinity of oxygen, producing carboxyhaemoglobinemia and shifting the dissociation curve left), and hydrogen cyanide (which inhibits cytochrome oxidase and cellular respiration). | ABPI <0.8 (or calcified >1.3), absent pedal pulses, delayed CRT (>3 s), cool pale extremity, rest pain, wound bed with dry, pale, avascular appearance. |
| Local: Bioburden | Infection, Critical Colonisation & Biofilms | High microbial load (> $10^5$ CFU/g of tissue) and polymicrobial biofilms encased in extracellular polymeric substance (EPS) maintain the wound in a persistent hyper-inflammatory state. Excessive release of pro-inflammatory cytokines (TNF-$\alpha$, IL-1$\beta$) stimulates uninhibited release of matrix metalloproteinases (MMPs), which systematically degrade newly formed collagen, fibronectin, and endogenous growth factors. | Friable, easily bleeding granulation tissue, pocketing/undermining, foul malodour, increased thick exudate, spreading erythema, stalled edge advancement. |
| Local: Moisture | Desiccation vs. Maceration | A dry wound bed arrests keratinocyte migration, forcing cells to burrow into deeper, moist planes to survive, causing cellular death and forming hard eschar. Conversely, excessive wound exudate contains high concentrations of catabolic proteases that digest the surrounding healthy stratum corneum, producing peri-wound maceration and skin breakdown. | Desiccated wound: dry, scabbed, pain on exposure. Macerated wound: white, soggy, waterlogged, softened skin surrounding the wound margin. |
4. Comprehensive Wound Assessment: The TIME Framework
Endorsed across Irish acute hospital groups and community health organisations (CHOs), the TIME framework provides a standardized, systematic approach to wound bed preparation (WBP). Its clinical objective is to identify and systematically remove local barriers to natural tissue repair.
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| THE CLINICAL "TIME" ASSESSMENT FRAMEWORK |
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| T = TISSUE VIABILITY |
| Evaluate non-viable tissue (slough, eschar) vs viable (granulation, |
| epithelial). Objective: Debridement to restore healthy wound bed. |
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| I = INFECTION OR INFLAMMATION |
| Identify local infection, critical colonisation, biofilm, or systemic |
| sepsis. Objective: Antimicrobial stewardship & biofilm disruption. |
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| M = MOISTURE BALANCE |
| Assess exudate volume, colour, and viscosity; protect peri-wound skin. |
| Objective: Maintain physiological moist environment without maceration.|
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| E = EDGE / EPITHELIAL ADVANCEMENT |
| Inspect wound margins: advancing vs rolled (epibole), undermined. |
| Objective: Promote inward cellular migration & resurfacing. |
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The TIME Framework in Irish Tissue Viability Practice
| Component | Clinical Assessment Parameters | Visual & Tactile Characteristics | Evidence-Based Clinical Action |
|---|---|---|---|
| T = Tissue<br/>(Viable vs. Non-viable) | Determine the percentage distribution of tissue types in the wound bed:<br/>- Epithelial tissue: Pink, pearly, thin, translucent, migrating across surface.<br/>- Granulation tissue: Healthy beefy red, moist, cobblestone texture, highly vascular.<br/>- Hypergranulation: Dark red/purple, spongy, raised above skin level, bleeds on contact; halts epithelial migration.<br/>- Slough: Yellow, cream, grey, or tan devitalised tissue; moist, viscous, or fibrinous; firmly or loosely adherent.<br/>- Necrotic / Eschar: Black or dark brown devitalised tissue; hard, dry, leathery (dry gangrene) or soft, boggy (wet gangrene). | Inspect under bright, non-glare illumination. Document percentages (e.g., 60% granulation, 40% slough). Differentiate healthy firm red granulation from pale, friable tissue. | Facilitate debridement of non-viable tissue:<br/>- Autolytic debridement: Apply hydrogels or hydrocolloids to rehydrate slough/eschar.<br/>- Sharp/surgical debridement: Carried out by credentialed specialist for extensive necrotic load.<br/>- Precaution: Keep stable, dry, uninfected eschar on ischemic heels dry and intact; do not debride until vascular status is verified. |
| I = Infection or Inflammation<br/>(Microbial balance) | Evaluate the wound along the microbial continuum:<br/>- Contamination / Colonisation: Normal commensal flora; does not delay healing.<br/>- Critical Colonisation / Biofilm: Bacteria form a self-protecting matrix; delayed healing, increased exudate, fragile granulation, absence of overt spreading signs.<br/>- Local Infection: Classic signs: new/escalating pain, spreading erythema (>2 cm from margin), local heat, edema, induration, purulent exudate, foul malodour, friable tissue.<br/>- Systemic Sepsis: Pyrexia (>38.0°C) or hypothermia (<36.0°C), tachycardia, tachypnoea, leukocytosis, altered mental status, INEWS trigger. | Perform thorough physical inspection. Differentiate local inflammation from cellulitis or systemic spread. For suspected local infection, obtain a wound swab after cleansing using the Levine technique. | - Local / Critical Biofilm: Cleanse with surfactant-based wound irrigants; apply topical antimicrobial dressings (silver, medical honey, cadexomer iodine) for a restricted 2-week challenge.<br/>- Spreading / Systemic Infection: Immediately escalate to medical team; initiate empirical systemic IV/oral antibiotics; obtain blood cultures; monitor INEWS score. |
| M = Moisture Balance<br/>(Exudate management) | Evaluate exudate characteristics:<br/>- Volume: None/dry, low/scant, moderate, heavy/copious.<br/>- Colour: Serous (clear, straw-coloured), haemoserous (pink, thin), sanguineous (frank blood), purulent (thick, opaque, yellow/green/brown).<br/>- Consistency: Thin/watery vs. thick, viscous, tenacious.<br/>- Odour: None vs. faint, sour, or putrid/offensive.<br/>- Peri-wound skin condition: Inspect for maceration (white, softened, waterlogged rim), excoriation (linear scratch/stripping marks), or contact dermatitis. | Remove and weigh/inspect soiled dressing. Check for strike-through leakage. Palpate peri-wound margins for softness or induration. | - Excessive Exudate: Select high-absorbency secondary dressings (calcium alginates, hydrofibres, polyurethane foams); apply zinc- or dimethicone-based peri-wound barrier creams/films.<br/>- Deficient Moisture: Donate moisture using amorphous hydrogels; apply semi-occlusive dressings to prevent desiccation. |
| E = Edge / Epithelial Advancement<br/>(Wound perimeter) | Evaluate perimeter integrity and advancement:<br/>- Healthy / Advancing: Continuous, flush with wound bed, sloping gently, translucent pink epithelial margin advancing inward.<br/>- Rolled / Epibole: Keratinocytes curl downwards into the wound bed instead of migrating across, halting epithelialisation.<br/>- Undermined / Tunneling: Destruction of underlying subcutaneous connective tissue beneath intact epidermal margins.<br/>- Punched-out: Well-demarcated, steep margins; classic for arterial ulcers.<br/>- Hyperkeratotic / Calloused: Thickened stratum corneum; common in diabetic neuropathic foot ulcers. | Gently palpate and explore perimeter using a sterile, moistened cotton-tipped probe to detect pockets, undermining, and sinus tracts. | - Epibole: Requires clinical specialist intervention (silver nitrate cautery or surgical edge debridement) to restart migration.<br/>- Undermining / Cavity: Loosely pack dead space with ribbon gauze or alginate cavity rope to prevent superficial premature closure and abscess formation.<br/>- Calloused border: Debride hyperkeratosis to relieve mechanical pressure. |
5. Wound Measurement, Mapping & Documentation Standards
Accurate, objective clinical documentation is a statutory requirement under NMBI standards. Subjective descriptors (such as "wound looks cleaner" or "wound is small") are clinically unacceptable and legally indefensible.
Objective Measurement Technique
- Two-Dimensional Linear Measurement: Measure the wound in centimetres using a single-use flexible disposable ruler:
- Length: The longest vertical dimension from head to toe (12 to 6 o'clock anatomical orientation).
- Width: The widest horizontal dimension perpendicular to length (9 to 3 o'clock orientation).
- Depth Measurement: Gently introduce a sterile, blunt, single-use moistened probe into the deepest portion of the wound bed until resistance is met. Mark the probe level with the skin surface, withdraw, and measure against a sterile ruler.
- Mapping Undermining and Sinus Tracts: Use the standardized clock-face reference, where 12 o'clock always points toward the patient's head:
- Example Documentation: "Undermining extending 2.5 cm from 1 o'clock to 4 o'clock; sinus tract measuring 3.0 cm probing at 7 o'clock."
- Peri-Wound Skin Inspection: Record the presence of:
- Erythema: Measure distance of spread in centimetres from the wound edge (erythema extending >2 cm suggests cellulitis).
- Induration: Measure firmness/hardening of surrounding tissue by gentle palpation.
- Maceration: Note presence, width, and severity of white, waterlogged margins.
- Warmth: Compare temperature against the contralateral limb using the back of a gloved hand.
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| CLOCK-FACE MAPPING FOR UNDERMINING & CAVITIES |
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| 12:00 |
| (Towards Head) |
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| 09:00 <---------- (+) ----------> 03:00 |
| (Patient's (Patient's |
| Right) Left) |
| | |
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| 06:00 |
| (Towards Feet) |
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| Example Finding: Undermining 2.0 cm between 10:00 and 01:00 |
| Sinus tract 3.5 cm probing at 05:00 |
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The Levine Wound Swabbing Technique
In Irish acute and community practice, the Levine technique is the validated standard for microbiological wound sampling. Swabbing superficial unwashed pus or slough collects colonizing environmental flora rather than invasive tissue pathogens.
[!TIP] The Levine Swab Protocol:
- Cleanse the wound bed thoroughly with sterile 0.9% sodium chloride to remove surface debris and superficial colonisers.
- Locate an area of clean, viable granulation tissue (do not swab slough, necrotic eschar, or pooled pus).
- Rotate the sterile swab tip over a 1 cm² area with sufficient pressure to express vital tissue fluid from the deep wound bed.
- Insert immediately into transport medium, label with patient ID, anatomical site, date, time, and relevant clinical details (including current antimicrobial therapy), and dispatch to microbiology.
6. RCSI OSCE Practical Station Pitfalls & Critical Safety Standards
During the RCSI OSCE practical examination, candidates frequently fail the wound assessment and management station due to preventable procedural and infection control errors:
| OSCE Station Pitfall | Clinical / Pathophysiological Hazard | Mandatory RCSI Passing Action |
|---|---|---|
| Swabbing superficial slough or pus before cleansing. | Isolates non-pathogenic commensal organisms, leading to erroneous broad-spectrum antibiotic prescriptions and antimicrobial resistance. | Thoroughly irrigate the wound bed with sterile 0.9% saline first; use the Levine technique over 1 cm² of viable granulation tissue. |
| Omitting pre-procedure pain assessment. | Dressing manipulation can cause excruciating procedural pain, triggering sympathetic autonomic responses (tachycardia, hypertension). | Always assess pain using a validated numerical rating scale (NRS 0–10) prior to touching the wound. Verify if prescribed analgesia was administered 20–30 minutes prior. |
| Failing to assess depth, undermining, or tunneling. | Overlooks deep subcutaneous tracking, cavity abscesses, or osteomyelitis beneath an apparently small surface aperture. | Always use a sterile, blunt moistened probe to assess depth and explore margins using clock-face documentation. |
| Mistaking slough for purulent exudate or infection. | Misdiagnosing yellow fibrinous slough as pus leads to inappropriate antimicrobial therapy rather than indicated autolytic debridement. | Recognize slough as adherent, devitalised cellular debris; assess for true infection markers (erythema >2 cm, heat, malodour, systemic INEWS rise). |
| Debriding dry, stable eschar on an ischemic heel. | Breaks the body's natural sterile barrier in an avascular limb, converting dry gangrene into limb-threatening wet gangrene and sepsis. | Keep stable, dry, intact, uninfected heel eschar clean and dry; offload pressure; urgently refer for vascular assessment. |
Test Your Knowledge
A 64-year-old patient with type 2 diabetes and severe peripheral vascular disease undergoes an open appendicectomy. On postoperative day 4, the surgical incision exhibits separated edges, no palpable healing ridge, and thin serosanguinous oozing. Blood glucose has averaged 14.5 mmol/L, and serum albumin is 24 g/L. Which pathophysiological explanation best accounts for this patient's impaired wound healing?
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Test Your Knowledge
A registered nurse in an Irish acute hospital is performing a wound assessment using the TIME framework on an 82-year-old bedbound patient with a sacral pressure injury. The wound measures 4.5 cm x 3.8 cm x 1.2 cm. The wound bed comprises 70% adherent yellow fibrinous tissue and 30% beefy red tissue. There is moderate seropurulent exudate with a faint sour odour, and the surrounding skin exhibits a 0.8 cm margin of softened, white, waterlogged epidermis. How should the nurse accurately classify and document these clinical findings?
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Test Your Knowledge
During an RCSI OSCE station on wound assessment and microbiological investigation, the candidate is required to obtain a wound swab from a chronic dehisced abdominal wound exhibiting localized signs of infection. Which technique represents the correct evidence-based procedure endorsed in Irish clinical practice?
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