The primary goal of wound care is facilitating the natural healing processes rather than technical repair alone. Wound healing involves inflammatory, proliferative, and remodeling phases. Wound preparation includes anesthesia, hemostasis, debridement, cleaning, and closure or dressing. Factors like infection, nutrition, tissue ischemia, and tension can impair healing. Proper wound evaluation and management are essential for optimal healing outcomes.

1. WOUND CARE “ the primary goal of wound care is not the technical repair of the wound; it is providing optimal conditions for the natural reparative processes of the wound to proceed” – Richard L. Lammers (Roberts and Hedges)

2. GOALS of wound care Facilitate hemostasis Decrease tissue loss Promote wound healing Minimize scar formation

3. INTRODUCTION

4. Wound healing : PATHOPHYSIOLOGY 1.) Inflammatory Phase Initial response (Day 1-4 post injury) rubor, tumor, dolor, calor Platelet aggregation and activation Leukocyte (PMNs, macrophages) migration, phagocytosis and mediator release Venule dilation Exudative a biologic debridement In wounds closed by primary intention, lasts 4 days

5. 2.) Proliferative Phase Day 4-42 macrophage-released growth factors  Fibroblast proliferation  Increased rate of collagen synthesis Granulation tissue and neovascularization Gain in tensile strength

6. 3.) Remodeling Phase 6wks-1 year Intermolecular cross-linking of collagen via vitamin C-dependent hydroxylation Characterized by increase in tensile strength Type III collagen replaced with type I Scar flattens

7. TYPES of Wound Healing 1.) Healing by first intention (aka. primary wound healing or primary closure) wound closed by approximation of wound margins or by placement of a graft or flap , or wounds created and closed in the operating room. Best choice for wounds in well-vascularized areas Indications -recent (<24h old) -clean -viable tissue -tension-free treated within 24 h, prior to development of granulation tissue. epithelialize within 24 to 48 h. Water barrier function restored  can shower or wash.

8. 2.) Healing by second intention (aka. secondary wound healing or spontaneous healing) wound left open and allowed to close by epithelialization and contraction. Commonly : management of contaminated or infected wounds. without surgical intervention. Unlike primary wounds , approximation of wound margins occurs via reepithelialization and wound contraction by myofibroblasts. Presence of granulation tissue. Complications -late wound contracture -hypertrophic scarring

9. 3.) Healing by third intention (aka. tertiary wound healing or delayed primary closure) wounds that are too heavily contaminated for primary closure but appear clean and well vascularized after 4-5 days of open observation . Inflammation  reduced bacterial concentration (“debribe”)  allow safe closure. Indications :- infected or unhealthy wounds with high bacterial content, -wounds with a long time lapse since injury, or -wounds with a severe crush component with significant tissue devitalization. Wound edges are approximated within 3-4 days tensile strength develops as with primary closure.

10. wound preparation (debridement,cleansing, etc.) dress with saline soaked fine mesh gauze follow up in 72-96 hours for debridement repeat cleansing and closure if no evidence of infection

11. Factors that affect wound healing Patient factor : Age Immunocompromising -DM - renal failure - AIDS - splenectomy Medications –systemic steroids/ other immunocompromising drugs  i ncreased infection rates Wound Characteristics - Time , Location , Etiology , Mechanism of injury , Laceration width

12. Factors that affect wound healing In general, remember “DIDN'T HEAL” D = Diabetes : -diminishing sensation and arterial inflow ++ acute loss of diabetic control  diminished cardiac output, poor peripheral perfusion, and impaired polymorphonuclear leukocyte phagocytosis. I = Infection : -potentiates collagen lysis. Bacterial contamination + susceptible host + wound environment = wound infection. Foreign bodies (including sutures) potentiate wound infection.

13. DIDN’T HEAL D = Drugs : Steroids and antimetabolites impede proliferation of fibroblasts and collagen synthesis. N = Nutritional problems: Protein-calorie malnutrition and deficiencies of vitamins A, C, and zinc. T = Tissue necrosis , from local or systemic ischemia or radiation injury. Blood supply is important.

14. DIDN’T HEAL H = Hypoxia : -esp the distal extent of the extremities. Blood volume deficit, unrelieved pain, or hypothermia  sympathetic overactivity  local vasoconstriction  Inadequate tissue oxygenation. E = Excessive tension on wound edges  local tissue ischemia and necrosis.

15. DIDN’T HEAL A = Another wound : Competition for the substrates required for wound healing. L = Low temperature : (relatively) distal aspects of the upper and lower extremities (a reduction of 1-1.5°C [2-3°F] from normal core body temperature) is responsible for slower healing of wounds at these sites.

16. Wound Evaluation -HISTORY identify all extrinsic and intrinsic factors that jeopardize healing and promote infection – mechanism of injury – time of injury (accelerated growth phase of bacteria starts at 3 hours post wound) – environment in which wound occurred potential contaminants, foreign bodies – species of animal if bite wound – pt’s medical problems (allergies to medication) / immune status tetanus immunization status

17. history Immunocompromised Bleeding disorder.Prolonged bleeding-. Hematoma can serve as culture medium for wound infection. Peripheral vascular disease

18. Mechanism of injury FORCE OBJECT DAMAGE WOUND shear Sharp Minimal Linear compression Blunt Right angle Moderate (+) Stellate Jagged tensile Blunt Oblique angle Moderate (+) Triangular Flap

19. TYPES of wound Abrasions Superficial layer of tissue is removed Avulsions A section of tissue is torn off (partially or totally) Lacerations Ti ssue is cut or torn. Sharply demarcated borders. Puncture Small opening and of indeterminate depth. Contusion forceful blow, outer layer of skin intact ; minimal wound care ; evaluate for possible hematoma Combination wound

20. Wound assessment Examine for: – amount of tissue destruction – degree of contamination – damage to underlying structures

21. • Body Location – Proximity to Other Structures – Joints –Nerves –Tendons –Vasculature – Test integrity of each structure • Assess laxity/muscle and tendon function • Assess 2-point discrimination • Assess vascular supply

22. Physical examination Wound Location – importance in the risk of infection – high endogenous bacterial counts in hairy scalp, forehead, axilla, groin, foreskin of penis, vagina, mouth, nails – wounds in areas of high vascularity more easily resist infection (scalp, face)

23. WOUND PREPARATION

24. Wound Preparation - Anesthesia Topical Solution or paste LET TAC EMLA Local Direct infiltration 1% lidocaine with or without epinephrine Bupivicaine or sensorcaine for longer acting anesthesia Regional Block Local infiltration proximally in order to avoid tissue disruption Smaller amount of anesthesia required

25. Topical anesthesia Solely / with local infiltration Most effective : face and scalp (high vascularity) LET ( lidocaine, epinephrine, tetracaine) TAC ( tetracaine, adrenaline/epinephrine, cocaine ) cotton ball soaked with 3–5ml applied to the open wound for at least 10 minutes

26. Local anesthetic Drug Max Dose Onset Duration Cocaine 6.6 mg/kg Rapid 1 hour Procaine 10-15 mg/kg Rapid 30min-1hr Tetracaine 1.5 mg/kg Moderate 2 hours Lidocaine 5 mg/kg 5-30 min 2 hours (with Epi) 7 mg/kg 5-30 min 2-3 hours Bupivacaine 2 mg/kg 7-30 min > 6 hours

27. Epinephrine Vasoconstrictive – Increases Duration of Action – Promotes Hemostasis – Avoid end-arterial blood supply areas – May increase pain (low pH)

28. Local infiltration reduce the pain of anesthetic infiltration 1. Premedicate the wound with a topical anesthetic (described above) or ice. 2. B uffer anesthetic with sodium bicarbonate ( 1 ml/ 10 ml )  less painful anesthetic. 3. Needle size : smallest diameter needle . A 30-gauge needle is preferred. 4. Inject slowly (10sec), as pain results when the soft tissue stretches.

29. Wound Preparation - Hemostasis Direct Pressure–Usually best choice Ligatures Use a tourniquet Chemicals – Epinephrine – Gelfoam – Oxycel – Actifoam Cautery

30. Wound Preparation – Foreign Body Removal Suspect with point tenderness Visual inspection (to the apex) Imaging Glass, metal, gravel fragments >1mm should be visible on plain radiographs Organic substances and plastics are usually radiolucent Always discuss and document possibility of retained foreign body

31. Hair removal Shaving – Increases risk of infection X 10 ! Clip Hair with Scissors Matt Hair with Ointment Never shave eyebrows ( may not regrow )

32. Wound preparation : CLEANING high pressure irrigation (Normal Saline) min 100-300 ml with continued irrigation at least 8 psi force to the wound  the irrigation fluid dislodges foreign bodies, contaminants, and bacteria. A simple device setup 30-60 ml syringe and an 14-gauge angiocatheter.

33. Wound Preparation – Debridement Removes devitalized tissue Creates sharp wound edge Excision with elliptical shape Respect skin lines

34. Indications for systemic antibiotic for traumatic wounds • Injury 6 hours old on the extremities Injury 24 hours old on the face and scalp Tendon, joint, or bony involvement • Cartilage involvement • Mammalian bite • Co-morbidity (diabetes mellitus, extremes of age, steroid use, morbid obesity) Puncture wound Complex intraoral wound

35. “ Prophylactic” Antibiotics If Prescribed • Duration 3 –7 days • Wound Recheck in 24 –48 hours

36. Wound preparation -Tetanus prophylaxis Clean wounds Incompleted immunization  toxoid >10 years, then give toxoid Tetanus prone wound Incompleted immunization  Toxoid & immunoglobulin > 5 years, give toxoid

37. WOUND CLOSURE Undermine the wound edges Release tension

38. Wound closure in relation to time Primary closure Suture, staple, adhesive, or tape Performed on recently sustained lacerations: <12 hours generally and <24 hours on face Secondary closure Secondary intent Allowed to granulate Tertiary closure Delayed primary (observed for 3-4days)

39. Suture supply needle drivers … tissue forceps (or skin hook) Scissors sterile drapes sterile gloves suture materials sterile gauze

40. Suture Material Absorbable Chromic catgut ( natural monofilament) Vicryl (synthetic braided) PDS II (synthetic monofilament) Non-Absorbable Silk (natural braided) Ethilon (synthetic monofilament) Monofilament (smooth but stiff) vs. Braided (has interstices = haven for bacteria)

41. Suture size Skin Face 5/0 or 6/0 Hands and Limbs 3/0 or 4/0 Elsewhere 2/0 or 3/0

42. SUTURE TECHNIQUES Deep layer approximation Absorbable sutures Buried knot Serves two purposes Closes potential spaces Minimizes tension on the wound margins

43. Skin Closure Key – wound edge eversion “ Approximate, don’t strangulate” Anticipate wound edema Choose appropriate size of suture for location of laceration

44. Suture Techniques Simple Interrupted Used on majority of wounds Each stitch is independent

45. Suture Techniques Simple Continuous Useful in pediatrics Rapid Easy removal Provides effective hemostasis Distributed tension evenly along length Can also be locked with each stitch

46. Suture Techniques Horizontal Mattress Useful for single-layer closure of lacerations under tension

47. Suture Techniques Vertical Mattress Useful for everting skin edges “ Far-far-near-near”

48. Suture Techniques Purse-string Useful for stellate lacerations

49. Suture Techniques Instrument tie

50. Other devices in wound closure Staples Quick, poor aesthetic result where scar is less of an issue (hairy scalp) Adhesives Dermabond clean, sharp edges, clean nonmobile areas, laceration less than 5 cm in length Tape Steri-strips superficial, straight laceration under little tension

51. After care • Wound Dressings • Maintain dry –24 –48 hours – Augments reepithelialization •“ Water-Tight” after 48 hours • Bandages – Soft-splint – Absorb exudates – Protects Wound – Protects knots

52. Suture removal guidelines Anatomic location Days (average) face 3-5 arm 7 anterior trunk 7 back 10-14 feet and hand 10-14 joint 10-14 scalp 10-14

53. Wounds appropriate for consultation/referral • Primary provider is unable to perform optimal repair – Skill level does not match complexity of wound – Practice setting is too busy to allow adequate time for repair • Underlying injury – Tendon ,Nerve, Vascular,Joint involvement or underlying fracture Eyelid : tarsal plate or lacrimal duct involvement Patient requests specialist • Operative repair necessary – Skin grafting – Flap creation or rotation

54. References www.cme-ce-summaries.com/emergency-medicine/em2604.html www.medstudentlc.com www.emedicine.medscape.com www.proceduresconsult.com Essential Practice of Surgery : Basic Science and Clinical Evidence;2003;chapter7;pg77-88;H.Peter Lorenzo, Michael T. Longaker. Robbins Basic Pathology 8 th edition;chapter3;pg70-8; Kumar, Abbas, Faustro, Mitchell. Essential Surgery : Problems, Diagnosis & Management ; chapter11;pg149-58; H.G. Burkitt,C.R.G. Quick, J.B.Reed. Wound Management ; powerpoint presentation by UNC emergency medicine (Medical Student Lecture Series). Wound Management Principles ; powerpoint presentation by Donald J Sefcik and Nicole Y Ottens, FACOEP. Wound Management 2001 ; powerpoint presentation by Gavin Greenfield and Bob Johnston.

55. Practice Time!