FINAL EXAM Flashcards
what is the inflammatory process?
steps toward healing of injured tissue
what is the ultimate goal of treating an injury?
promote a strong, mobile scar
full, pain free movement
full strength
what is inflammation?
immediate, local response to injury & tissue damage
causes of tissue damage (internal / external)
trauma, infection, surgery, immune responses, extreme heat / cold, ischemic damage, chemical / radiation damage
types of healing (inflammatory process)
simply by replication of missing cells OR structure is created using scar tissue
re-epithelialization
-only applies if skin is damaged
-epithelial tissue lost, begins to regenerate
-if damage is superficial involving only epithelial layer, healing = regeneration of tissue
-NO scar tissue, normal tissue structure results
-regeneration possible with epithelial cells & nerve hepatic cells
granulation tissue
-part of any tissue repair where there is 1st/2nd intention healing
-adequate blood supply & nutrients must be present
-fibroblasts = important -> synthesize new collagen fibers that form loose CT matrix
-matrix replaces clot developed in acute stage
-resultant vascular CT = granulation tissue
NEOANGIOGENESIS (granulation tissue)
new blood vessels develop from venues at edge of injury
SCAR TISSUE (inflammatory process)
increases loss of epidermal tissue layers / damage to other tissue (muscle, tendon, ligaments)
-healing results from synthesis of new tissue
-requires production of CT with collagen fibers to replace area damaged
-restores structure but with different tissue than original
-MATURE COLLAGEN REPAIR
2 types of healing (inflammatory process)
first intention healing
second intention healing
primary / first intention healing
-some tissue loss, wound edges approximated (tape, sutures, staples)
-healing is efficient, with small amounts of collagen produced
secondary / second intention healing
-extensive tissue loss / large area affected
-wound edges cannot be brought together easily
-healing takes longer
-extensive re-epithelialization
-production of large amounts of granulation tissue
factors that affect the healing process
severity of injury, age, infection, presence of foreign material, nutritional support, existing conditions, adequate blood supply, wound separation, drugs, smoking
ACUTE STAGE (inflammatory process)
-from moment of injury -> 3 to 4 days post
-redness, swelling, heat, pain, loss of ROM, bruising (purple)
EARLY SUBACUTE STAGE (inflammatory process)
-within 2 days -> up to 3 weeks
-diminished inflammation, pink, warm, less painful
-muscle spasm diminished
-bruising unchanged
-primary process = filling damaged area with new tissue
LATE SUBACUTE STAGE (inflammatory process)
-2-3 weeks of subacute
-may be pocket of residual swelling
-minimal discomfort, possible loss ROM
-blood vessels developed with neoangiogenesis
-bruising changes to yellow / green
-pain with overpressure
WOUND CONTRACTION (inflammatory process)
-myofibroblasts in wound matrix contain contractile fibers
-purpose: speed healing process (peaks 2 weeks after injury)
-can result in deformation of tissue & possible dysfunction
SCAR REMODELING (inflammatory process)
-reshaping & reorganizing of healing begin as existing collagen is broken down, new collagen synthesized, cross links develop among collagen fibers
-strength of site beings to increase
CHRONIC STAGE (inflammatory process)
-overlaps with late subacute, 2-3 weeks post injury -> 1-2 years
-inflammatory process resolved, no edema
-chronic inflammation may result as part of self-perpetuating cycle
what is an injury?
disruption of the continuity of any tissue
epidermis
-outer layer
-cells have short life span (28-30) days, which results in continuous sloughing & renewal of this layer
dermis
-below epidermis
-anchors & nutritionally supports epidermis
-elastin & collagen -> flexibility & strength
-contains sebaceous (oil) & sweat glands, hair follicles, nerve receptors, blood & lymphatic vessels
subcutaneous layer
-contains adipose tissue, larger blood vessels, deep hair follicles
-below layer are muscles & bone
functions of skin
-prevent invasion of infective organisms & protects underlying tissue from injury
-nerve endings: inform body of sensory stimuli (temp, pressure, touch, pain)
-control body temp through sweating & shivering
-allows gas exchange through pores & keeps fluids & electrolytes balanced
-absorbs sunlight (vitamin D)
-subcutaneous layer stores fat = insulation & protection