Wound Healing, Scar Formation & Care Principles

Scar Tissue & Associated Concerns

  • Scar-tissue formation is a universal response to injury, BUT magnitude & location alter consequences.
    • Excessive collagen deposition ➜ keloid
    • Permanent, raised, enlarged scar.
    • Body essentially goes into “over-drive.”
    • Text reference: p. 789 (visual example).
    • Contractures
    • Scar tissue laid down across or around a joint stiffens / shortens peri-articular structures.
    • High-risk joints: hands, feet, knees, any joint with high daily use.
    • Nursing implication: maintain ROM exercises & early mobility to prevent loss of motion.
    • Internal scar tissue = adhesions
    • Occurs post-operatively (esp. abdominal or pelvic surgery, e.g., C-section).
    • Bands of fibrous tissue may tether organs together → Pain, functional impairment (e.g., ovary-uterus, bladder attachments).
    • Surgical correction: lysis of adhesions ("LOA").

Wound Closure by Intention (Fig. 39-3, p. 790)

  • Primary (1°) / First Intention

    • Little/no tissue loss; edges neatly approximated (e.g., surgical incision).
    • Features
    • Closed via sutures, staples, steri-strips.
    • Infection risk↓\text{Infection risk} \downarrow (sterile field + small surface).
    • Fastest epithelial & connective-tissue restoration.
    • Documentation cue: “Wound edges well-approximated.”

  • Secondary (2°) Intention

    • Significant tissue loss; edges cannot be approximated (ragged, mangled, pressure injury, large laceration).
    • Wound left open → fills with granulation tissue → scar tissue.
    • Consequences
    • Longer healing window.
    • Infection risk↑\text{Infection risk} \uparrow (larger surface + prolonged exposure).

  • Tertiary (3°) / Delayed Primary Intention

    • Also called delayed closure.
    • Wound initially left open (e.g., abdominal surgery requiring drainage) → closed later after adequate granulation tissue & reduced contamination.
    • Requires delayed suturing; balances drainage needs vs. eventual tissue approximation.

Factors That Impact Wound Healing (p. 788)

  • Age

    • Children & healthy adults heal fastest.
    • Elderly & those with chronic disease heal slower.

  • Perfusion-Related Conditions

    • Peripheral Vascular Disease (PVD), cardiovascular disease.
    • ↓ Blood flow → ↓ O2O_2 & nutrient delivery.
    • Diabetes mellitus
    • Microvascular damage + neuropathy → delayed detection/infection + impaired perfusion.
    • Obesity
    • Adipose tissue = hypovascular; impedes oxygen diffusion & stresses suture lines.

  • Organ Function

    • Liver
    • Synthesizes clotting factors; impaired function → ↓ coagulation → impaired hemostasis.
    • Lungs
    • Gas exchange source; ↓ lung function → ↓ arterial O2O_2 → ↓ collagen synthesis.

  • Immune Competence

    • Immunosuppression (disease or drugs) ↓ antibodies & monocytes → ↑ infection susceptibility.

  • Nutrition

    • Adequate protein, vitamins A, C, K, zinc, iron essential.

  • Lifestyle

    • Smoking
    • Nicotine causes vasoconstriction; carbon monoxide competes with hemoglobin → HbO2HbO_2 ↓.
    • Regular exercise enhances circulation / tissue oxygenation.

  • Medications

    • Anti-inflammatories (NSAIDs) & steroids
    • Blunt inflammatory phase; steroids also mask infection.
    • Immunosuppressants (e.g., for autoimmune disorders).
    • Anticoagulants (e.g., heparin) → interfere with clot stability.

  • Infection

    • Bacterial colonization → ↑ exudate, tissue destruction, antibiotic need.
    • Hospital-acquired, drug-resistant organisms add complexity.

  • Chronic Illnesses

    • Diabetes, cardiovascular & immune disorders reiterate above mechanisms.

TIME Principle of Wound Management (Mnemonic)

  • T – Tissue (debridement)
    • Remove non-viable tissue/eschars; create clean, moist base for granulation.
  • I – Infection/Inflammation control
    • Culture, systemic or topical antimicrobials as indicated.
  • M – Moisture balance
    • Maintain moist environment yet manage excessive drainage (e.g., absorptive dressings) to avoid maceration.
  • E – Edge of wound (advancement & closure)
    • Encourage epithelial migration; close if possible; monitor for enlargement.

Clinical Monitoring & Documentation Tips

  • Edge approximation
    • Always chart whether edges are “well-approximated” or “separated.”
  • Cellulitis spread mapping
    • Outline erythematous border with permanent marker → track expansion or regression.
  • Sterile technique
    • Mandatory for surgical procedures to preserve primary-intention benefits.
  • Breaks in expected healing ("wound reopening/restart")
    • May necessitate reassessment & shifting to secondary or tertiary intention strategy.

Practical / Ethical Implications

  • Early mobility & ROM prevent debilitating contractures—quality-of-life issue.
  • Recognizing & addressing internal adhesions avoids chronic pain & organ dysfunction.
  • Judicious steroid / NSAID prescription balances desired anti-inflammatory effect vs. healing delay.
  • Surveillance for hospital-acquired resistant infections protects patient & public health.

Numbers, Pages & Figures Mentioned

  • Keloid image: p. 789.
  • “Intention” diagram: Fig. 39.3, p. 790.
  • Wound-healing factors list: p. 788.
  • Lecture reference break: return @ 03:17.