6.2 Aseptic Non-Touch Technique (ANTT) & Wound Management

6.2 Aseptic Non-Touch Technique (ANTT) & Wound Management

Infection prevention and clinical wound management are core nursing competencies essential for promoting healing, preventing healthcare-associated infections (HCAIs), and minimizing patient morbidity. In the UK, the Aseptic Non-Touch Technique (ANTT®) framework provides a standardized, evidence-based approach to clinical procedures. Coupled with systematic wound assessment tools such as the TIME framework and validated pressure ulcer prevention strategies, nurses play a central role in maintaining skin integrity and tissue viability.

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Principles of Aseptic Non-Touch Technique (ANTT)

ANTT is a clinical practice framework designed to prevent the micro-transmission of pathogens to susceptible body sites during invasive procedures or wound care. The overarching principle of ANTT is that asepsis is maintained by protecting Key Parts and Key Sites from contamination.

Definitions of Core Concepts

• Key Parts: The unsterilized parts of medical equipment that, if contaminated with microorganisms, will directly infect the patient or contaminate sterile fluids (e.g., syringe tips, needle shafts, IV line male luer connections, exposed catheter tips, sterile dressing inner surfaces).
• Key Sites: Open surgical wounds, acute or chronic wound beds, skin insertion sites for invasive devices (e.g., PIVC, central line sites, urinary meatus), or body cavities.

The ANTT Clinical Rules

1. Always perform risk assessment: Determine whether Standard or Surgical ANTT is required.
2. Decontaminate work surfaces: Clean stainless steel or plastic procedure trays with 70% isopropyl alcohol wipes for 30 seconds and allow them to air dry completely for 30 seconds prior to use.
3. Perform strict hand hygiene: Execute effective hand decontamination using the 6-step WHO technique before and after every procedure.
4. Never touch Key Parts directly: If a Key Part must be touched, sterile gloves must be worn; otherwise, non-touch technique (using non-sterile gloves and forceps or handles) is used.
5. Protect Key Parts using micro-critical fields: Use sterile caps, syringe covers, or sterile packaging to safeguard Key Parts individually.

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Standard ANTT vs. Surgical ANTT

ANTT categorises clinical procedures into two operational levels based on procedural complexity, duration, and the size or number of Key Parts and Key Sites.

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Holistic Wound Assessment & The TIME Framework

Effective wound management requires a systematic evaluation of both the patient's overall health (nutrition, perfusion, blood glucose control, mobility) and the local wound environment. The TIME framework is the gold-standard tool utilized across the NHS for structured wound bed preparation.

                      ┌─────────────────────────────────┐
                      │     TIME Wound Bed Assessment   │
                      └────────────────┬────────────────┘
                                       │
            ┌──────────────────┬───────┴──────────┬──────────────────┐
            ▼                  ▼                  ▼                  ▼
    ┌───────────────┐  ┌───────────────┐  ┌───────────────┐  ┌───────────────┐
    │  T - Tissue   │  │ I - Infection │  │ M - Moisture  │  │   E - Edge    │
    │ Non-viable vs │  │ Inflammation  │  │ Exudate level │  │ Advancement & │
    │ Granulating   │  │ & Biofilm     │  │ & Maceration  │  │ Epithelial    │
    └───────┬───────┘  └───────┬───────┘  └───────┬───────┘  └───────┬───────┘
            │                  │                  │                  │
            ▼                  ▼                  ▼                  ▼
    ┌───────────────┐  ┌───────────────┐  ┌───────────────┐  ┌───────────────┐
    │ Debridement   │  │ Antimicrobial │  │ Absorbent vs  │  │ Re-evaluate   │
    │ (Hydrogel)    │  │ (Silver/Iodine)│ │ Hydrating     │  │ Periwound     │
    └───────────────┘  └───────────────┘  └───────────────┘  └───────────────┘

Components of the TIME Model

• T - Tissue Management: Assess the composition of the wound bed.
  • Necrotic tissue (Eschar): Black/brown, hard, devitalized tissue. Impedes healing; requires autolytic or sharp debridement.
  • Slough: Yellow/grey, viscous or fibrous non-viable tissue. Requires removal via hydrogels or hydrofibres.
  • Granulation tissue: Red, moist, highly vascularized healthy tissue. Protect from trauma.
  • Epithelial tissue: Pink/pale skin advancement covering the wound surface.
• I - Infection & Inflammation: Evaluate for clinical signs of infection (increased erythema, localized heat, swelling, purulent exudate, delayed healing, foul odor, or sudden pain increase). If localized infection or biofilm is suspected, consider short-term topical antimicrobials; if systemic infection/cellulitis is present, obtain a wound swab (using Levine's deep tissue pressure technique) and initiate systemic antibiotics.
• M - Moisture Balance: Excessive exudate leads to maceration (softening and breakdown of surrounding healthy periwound skin). Insufficient moisture causes desiccation (drying out) and halts cellular migration. Select dressings to maintain a moist wound-healing environment.
• E - Edge Advancement: Inspect wound margins. Non-advancing, rolled (epibole), or hyperkeratotic edges prevent epithelial cell migration and indicate chronicity, requiring wound edge re-evaluation or barrier creams.

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Evidence-Based Dressing Selection Principles

Primary dressings are selected based on the specific TIME findings and exudate levels:

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Pressure Ulcer Classification & Prevention Strategies

A pressure ulcer (pressure injury) is localized damage to the skin and underlying soft tissue, usually over a bony prominence, resulting from intense/prolonged pressure or pressure in combination with shear forces.

EPUAP / NPUAP Pressure Ulcer Categories

• Category I - Non-Blanchable Erythema: Intact skin with localized non-blanchable redness (redness that does not turn white when pressed). May be painful, firm, or warmer/cooler compared to adjacent tissue.
• Category II - Partial-Thickness Skin Loss: Shallow open ulcer with a red/pink wound bed without slough, or an intact or ruptured serum-filled blister.
• Category III - Full-Thickness Skin Loss: Subcutaneous fat may be visible, but bone, tendon, or muscle are NOT exposed. Slough may be present.
• Category IV - Full-Thickness Tissue Loss: Exposed or directly palpable bone, tendon, ligament, or muscle. Slough or eschar may be present; high risk of osteomyelitis.
• Unstageable: Full-thickness skin and tissue loss in which the actual extent of tissue damage is completely obscured by slough or eschar.
• Suspected Deep Tissue Injury: Intact or non-intact skin with localized area of persistent, non-blanchable deep red, maroon, or purple discolouration due to damage of underlying soft tissue.

Risk Assessment & Prevention (The SSKIN Bundle)

In the NHS, risk assessment must be performed within 6 hours of admission using validated tools:

• Waterlow Score: Evaluates BMI, skin condition, mobility, continence, and special risk factors. Higher numerical score indicates higher risk (Score >10 = At Risk, >15 = High Risk, >20 = Very High Risk).
• Braden Scale: Evaluates sensory perception, moisture, activity, mobility, nutrition, and friction/shear. Lower numerical score indicates higher risk (Score ≤12 = High Risk).

Preventative care is delivered via the evidence-based SSKIN Care Bundle:

1. S - Surface: Provide dynamic alternating-pressure mattresses or high-spec foam mattresses.
2. S - Skin Inspection: Perform daily head-to-toe skin assessments over bony prominences (sacrum, heels, trochanters).
3. K - Keep Moving: Implement a structured 2-hourly repositioning schedule (e.g., 30° tilt position).
4. I - Incontinence & Moisture: Clean skin promptly after incontinence episodes; apply barrier films/creams.
5. N - Nutrition & Hydration: Provide high-protein nutritional supplements and ensure adequate fluid intake.